記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/D1AN01096D​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We demonstrate the facile, rational synthesis of monodispersedly sized zinc oxide (ZnO) nanowires from randomly sized seeds by hydrothermal growth. Uniformly shaped nanowire tips constructed in ammonia-dominated alkaline conditions serve as a foundation for the subsequent formation of the monodisperse nanowires. By precisely controlling the sharp tip formation and the nucleation, our
method substantially narrows the distribution of ZnO nanowire diameters from σ = 13.5 nm down to σ = 1.3 nm and controls their diameter by a completely bottom-up method, even initiating from randomly sized seeds. The proposed concept of sharp tip based monodisperse nanowires growth can be applied to the growth of diverse metal oxide nanowires and thus paves the way for bottom-up grown metal oxide nanowires-integrated nanodevices with a reliable performance.

DOI： 10.1021/acs.nanolett.9b04367

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： org/10.1021/acs.nanolett.8b05180

記述言語：英語   掲載種別：研究論文（学術雑誌）  

単結晶金属酸化物ナノワイヤは金属や半導体など材料系には見られない多彩な機能物性を示す興味深いナノ材料群である。Vapor-Liquid-Solid法は高結晶性のナノワイヤ構造体を構築可能な方法論であるが、本手法を用いて作製された単結晶金属酸化物ナノワイヤは大きなバンドギャップを有する絶縁体であるにも関わらず、結晶欠陥に由来する「意図しないドーピング」により高い電気伝導性が報告されており、ナノ機能物性抽出・変調へ向けて長年の技術的課題となっていた。本研究では、Vapor-Liquid-Solid成長において金属酸化物ナノワイヤの構成元素である酸素の供給フラックス（酸素圧）を変調させた際に、電気伝導性において異常な酸素圧依存性が観測された。電気伝導性及び化学組成の空間分布評価により、本依存性が気固界面及び液固界面といった競合する２つの結晶成長界面における結晶の本質的な差異に起因することを明らかにした。更に、上記実験結果に基づいて構築した1次元結晶成長モデル（分子動力学シミュレーション）に基づいて界面選択的結晶成長を行うことにより、金属酸化物ナノワイヤの超高結晶化に成功した。

DOI： org/10.1021/acs.nanolett.8b04668

出版者・発行元：Chem Catalysis  

Competing hydrogen evolution reaction (HER) and sluggish multi-electron/proton-involved steps are the major obstacles to improving the efficiency and selectivity of electrochemical nitrate reduction to ammonia (eNO3RR). Herein, we modified Co3O4 nanoparticles with doped rare-earth La atoms and carboxylic (COO−)-based organic ligands. The COO− groups efficiently reduce the water activity around the active sites by forming hydrogen bonds, thus controlling proton accessibility and regulating the adsorption selectivity between nitrate ions and protons. Simultaneously, introducing oxygen vacancies through La doping establishes active sites with a strong affinity for nitrate ions and an electron-rich local environment conducive to eNO3RR. The electrocatalyst exhibits superior activity and selectivity with an ammonia Faradaic efficiency of up to 99.41% and a yield rate of 5.62 mg h−1 mgcat−1 at −0.3 V vs. reversible hydrogen electrode (RHE). Notably, the catalyst maintains over 90% Faradaic efficiency for NH3 production across a broad potential range of 400 mV, surpassing most recently reported eNO3RR electrocatalysts.

DOI： 10.1016/j.checat.2024.101024

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出版者・発行元：IEEE Sensors Journal  

Sensor integration and low-power operation are required to collect different molecular information. However, it is challenging to integrate different types of sensors onto a single chip. To obtain multiple molecular information, temperature modulation of metal-oxide gas sensors is highly effective since it allows for the variation in sensor molecular sensitivity based on the operating temperature. This article covers a proposed novel system using metal-oxide gas sensors. The temperatures of the sensors are controlled by adopting self-heated sensors, which achieve local temperature increase and low-power operation. To simultaneously heat multiple sensors, we implemented a printed circuit board (PCB) for pulsed-heating scheme and streamlined intended input power with a proportional–integral–derivative (PID) controller. The performance of the implemented circuit is evaluated, and a maximum error rate of 1.7% of heating accuracy and 0.68% of average readout accuracy is ensured. As a proof-of-concept of the proposed gas sensory system, an array of 16 self-heated sensors was fabricated on a chip and tested with reactive gas molecules. The PID controller set the input power in 8 ms and kept constant power while sensor resistance changed. The proposed pulsed-heating measurement and conventional continuous-heating measurement were experimentally compared. The results of the experimental comparison suggest that while the sensitivity of the proposed pulsed-heating measurement decreases slightly, the power consumption due to heating can be reduced by up to 1/16.

DOI： 10.1109/JSEN.2024.3396376

Scopus

出版者・発行元：Device  

MicroRNAs (miRNAs) are prospective biomarkers for diagnosis and prognosis due to their specific functions. Conventional methods lack the ability to discriminate two main miRNA sources—extracellular vesicle (EV) miRNAs and EV-free miRNAs (i.e., miRNAs not contained in EVs)—in one sample. Here, we demonstrate that a nanowire (NW) thermomicrofluidic device integrated with a Peltier temperature controller can capture EVs and EV-free miRNAs and then preferentially release the EV-free miRNAs by thermal energy and extract the EV miRNAs via a lysis buffer. This leads to discrimination between EV miRNAs and EV-free miRNAs from ovarian cancer serum. Statistical analysis identified a relationship between miRNA source and tumor-related functions of the miRNAs: oncogenesis miRNAs were inside the EVs, and tumor-suppressor miRNAs were outside them. We demonstrate that the NW thermomicrofluidics provides the advantages of a simple, rapid, and effective method for miRNA extraction, accompanied by information from inside or outside the EVs.

DOI： 10.1016/j.device.2024.100363

Scopus

出版者・発行元：ACS Applied Materials and Interfaces  

Extracellular vesicles (EVs) contain a subset of proteins, lipids, and nucleic acids that maintain the characteristics of the parent cell. Immunotherapy using EVs has become a focus of research due to their unique features and bioinspired applications in cancer treatment. Unlike conventional immunotherapy using tumor fragments, EVs can be easily obtained from bodily fluids without invasive actions. We previously fabricated nanowire devices that were specialized for EV collection, but they were not suitable for cell culturing. In this study, we fabricated a ZnO/Al2O3 core-shell nanowire platform that could collect more than 60% of the EVs from the cell supernatant. Additionally, we could continue to culture dendritic cells (DCs) on the platform as an artificial lymph node to investigate cell maturation into antigen-presenting cells. Finally, using this platform, we reproduced a series of on-site immune processes that are among the pivotal immune functions of DCs and include such processes as antigen uptake, antigen presentation, and endocytosis of cancer-derived EVs. This platform provides a new ex vivo tool for EV-DC-mediated immunotherapies.

DOI： 10.1021/acsami.4c00283

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DOI： 10.1016/j.radphyschem.2024.111624

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出版者・発行元：Small  

In organic−inorganic hybrid devices, fine interfacial controls by organic components directly affect the device performance. However, fabrication of uniformed interfaces using π-conjugated molecules remains challenging due to facile aggregation by their strong π-π interaction. In this report, a π-conjugated scaffold insulated by covalently linked permethylated α-cyclodextrin moiety with an azido group is synthesized for surface Huisgen cycloaddition on metal oxides. Fourier-transformed infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy confirm the successful immobilization of the insulated azido scaffold on ZnO nanowire array surfaces. Owing to the highly independent immobilization, the scaffold allows rapid and complete conversion of the surface azido group in Huisgen cycloaddition reactions with ethynyl-terminated molecules, as confirmed by FT-IR spectroscopy monitoring. Cyclic voltammetry analysis of modified indium tin oxide substrates shows the positive effects of cyclic insulation toward suppression of intermolecular interaction between molecules introduced by the surface Huisgen cycloaddition reactions. The utility of the scaffold for heterogeneous catalysis is demonstrated in electrocatalytic selective O2 reduction to H2O2 with cobalt(II) chlorin modified fluorine doped tin oxide electrode and photocatalytic H2 generation with iridium(III) dye-sensitized Pt-loaded TiO2 nanoparticle. These results highlight the potential of the insulated azido scaffold for a stepwise functionalization process, enabling precise and well-defined hybrid interfaces.

DOI： 10.1002/smll.202403717

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Applied Materials and Interfaces  

A low-temperature Al2O3 deposition process provides a simplified method to form a conductive two-dimensional electron gas (2DEG) at the metal oxide/Al2O3 heterointerface. However, the impact of key factors of the interface defects and cation interdiffusion on the interface is still not well understood. Furthermore, there is still a blank space in terms of applications that go beyond the understanding of the interface’s electrical conductivity. In this work, we carried out a systematic experimental study by oxygen plasma pretreatment and thermal annealing post-treatment to study the impact of interface defects and cation interdiffusion at the In2O3/Al2O3 interface on the electrical conductance, respectively. Combining the trends in electrical conductance with the structural characteristics, we found that building a sharp interface with a high concentration of interface defects provides a reliable approach to producing such a conductive interface. After applying this conductive interface as electrodes for fabricating a field-effect transistor (FET) device, we found that this interface electrode exhibited ultrastability in phosphate-buffered saline (PBS), a commonly used biological saline solution. This study provides new insights into the formation of conductive 2DEGs at metal oxide/Al2O3 interfaces and lays the foundation for further applications as electrodes in bioelectronic devices.

DOI： 10.1021/acsami.3c03603

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PubMed

出版者・発行元：Solid-State Electronics  

Metal oxide molecular sensors have notable advantages in their low cost and small size, and they are useful to establish a low-power sensory system for massive data accumulation. However, most of them require high temperatures to cause chemical reactions, and an external heater is needed. Thus, their sensory system consumes around 1 W or higher power for operation. A candidate solution to decrease power consumption is using self-heated sensors. Since the heating area is limited in the sensor itself, mW-order and quick operation are possible. Since the sensors need careful temperature management, a dedicated analog circuit is demanded. Therefore, it is important to create their compact models in MATLAB or Verilog-A and predict the performance of the system as a whole with simulations. In this paper, an experimental self-heated sensor and its compact model are developed. To check the model's validity, some critical model parameters are determined firstly by experiments without self-heating. Then, the simulation outputs are compared with experimental results with self-heating. The comparison shows that the model predicts the saturation value and transient time constant of the gas reaction well. In addition, the error caused by the sensor's drift increases particularly if the sensor is operated in an inert gas.

DOI： 10.1016/j.sse.2023.108641

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsami.3c01443 ​

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Nanoscale Advances  

GaAs/AlGaAs core-shell nanowires, typically having 250 nm diameter and 6 μm length, were grown on 2-inch Si wafers by the single process of molecular beam epitaxy using constituent Ga-induced self-catalysed vapor-liquid-solid growth. The growth was carried out without specific pre-treatment such as film deposition, patterning, and etching. The outermost Al-rich AlGaAs shells form a native oxide surface protection layer, which provides efficient passivation with elongated carrier lifetime. The 2-inch Si substrate sample exhibits a dark-colored feature due to the light absorption of the nanowires where the reflectance in the visible wavelengths is less than 2%. Homogeneous and optically luminescent and adsorptive GaAs-related core-shell nanowires were prepared over the wafer, showing the prospect for large-volume III-V heterostructure devices available with this approach as complementary device technologies for integration with silicon.

DOI： 10.1039/d2na00848c

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.bios.2023.115318

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acssensors.1c01875

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Nano  

Extracellular vesicles (EVs) have promising potential as biomarkers for early cancer diagnosis. The EVs have been widely studied as biological cargo containing essential biological information not only from inside vesicles such as nucleic acids and proteins but also from outside vesicles such as membrane proteins and glycolipids. Although various methods have been developed to isolate EVs with high yields such as captures based on density, size, and immunoaffinity, different measurement systems are needed to analyze EVs after isolation, and a platform that enables all-in-one analysis of EVs
from capture to detection in multiple samples is desired. Since a nanowire-based approach has shown an effective capability for capturing EVs via surface charge interaction compared to other
conventional methods, here, we upgraded the conventional well plate assay to an all-in-one nanowire-integrated well plateassay system (i.e., a nanowire assay system) that enables charge-based EV capture and EV analysis of membrane proteins. We applied the nanowire assay system to analyze EVs from brain tumor organoids in which tumor environments, including vascular formations, were reconstructed, and we found that the membrane protein expression ratio of CD31/CD63 was 1.42- fold higher in the tumor organoid-derived EVs with a p-value less than 0.05. Furthermore, this ratio for urine samples from
glioblastoma patients was 2.25-fold higher than that from noncancer subjects with a p-value less than 0.05 as well. Our results demonstrated that the conventional well plate method integrated with the nanowire-based EV capture approach allows users not only to capture EVs effectively but also to analyze them in one assay system. We anticipate that the all-in-one nanowire assay system will be a powerful tool for elucidating EV-mediated tumor−microenvironment crosstalk.

DOI： 10.1021/acsnano.2c08526

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1246/cl.190318

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Nano  

Semiconducting nanomaterials with 3D network structures exhibit various fascinating properties such as electrical conduction, high permeability, and large surface areas, which are beneficial for adsorption, separation, and sensing applications. However, research on these materials is substantially restricted by the limited trans-scalability of their structural design and tunability of electrical conductivity. To overcome this challenge, a pyrolyzed cellulose nanofiber paper (CNP) semiconductor with a 3D network structure is proposed. Its nano-micro-macro trans-scale structural design is achieved by a combination of iodine-mediated morphology-retaining pyrolysis with spatially controlled drying of a cellulose nanofiber dispersion and paper-crafting techniques, such as microembossing, origami, and kirigami. The electrical conduction of this semiconductor is widely and systematically tuned, via the temperature-controlled progressive pyrolysis of CNP, from insulating (1012ω cm) to quasimetallic (10-2ω cm), which considerably exceeds that attained in other previously reported nanomaterials with 3D networks. The pyrolyzed CNP semiconductor provides not only the tailorable functionality for applications ranging from water-vapor-selective sensors to enzymatic biofuel cell electrodes but also the designability of macroscopic device configurations for stretchable and wearable applications. This study provides a pathway to realize structurally and functionally designable semiconducting nanomaterials and all-nanocellulose semiconducting technology for diverse electronics.

DOI： 10.1021/acsnano.1c10728

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PubMed

記述言語：英語   出版者・発行元：Chemical Communications  

In Fig. 4B, the y-axis should read ‘Number of sensors’ rather than ‘Accuracy (%)’, and the correct version of Fig. 4 is reproduced below. (Figure presented) The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and reader.

DOI： 10.1039/d2cc90179j

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PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Chemical Communications  

Breath odor sensing-based individual authentication was conducted for the first time using an artificial olfactory sensor system. Using a 16-channel chemiresistive sensor array and machine learning, a mean accuracy of >97% was successfully achieved. The impact of the number of sensors on the accuracy and reproducibility was also demonstrated.

DOI： 10.1039/d1cc06384g

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PubMed

出版者・発行元：Chemistry Letters  

We investigated material dependent molecule-to-surface interactions of volatile molecules using a core-shell metal oxide nanowire array. Varying the metal oxide species (ZnO, ZrO2 and TiO2), we clearly observed the metal cation dependence on the bonding strength of 2-nonanone. In addition, the quantitative analysis of molecular adsorption amount was successfully performed using the nanowire array. The results highlighted that the core-shell nanowire array provides a foundation for understanding and designing the molecule-to-surface interactions on various applications.

DOI： 10.1246/cl.220010

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記述言語：英語   出版者・発行元：Nano Letters  

In situ fabrication of well-defined bridging nanostructures is an interesting and unique approach to three-dimensionally design nanosensor structures, which are hardly attainable by other methods. Here, we demonstrate the significant effect of edge-Topological regulation on in situ fabrication of ZnO bridging nanosensors. When employing seed layers with a sharp edge, which is a well-defined structure in conventional lithography, the bridging angles and electrical resistances between two opposing electrodes were randomly distributed. The stochastic nature of bridging growth direction at the sharp edges inherently causes such unintentional variation of structural and electrical properties. We propose an edgeless seed layer structure using a two-layers resist method to solve the above uncontrollability of bridging nanosensors. Such bridging nanosensors not only substantially improved the uniformity of structural and electrical properties between two opposing electrodes but also significantly enhanced the sensing responses for NO2with the smaller variance and the lower limit of detection via in situ controlled electrical contacts.

DOI： 10.1021/acs.nanolett.1c04600

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PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1246/cl.220010​

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Nanoscale Advances  

Herein, we explore the hidden molecular recognition abilities of ZnO nanowires uniformly grown on the inner surface of an open tubular fused silica capillary via liquid chromatography. Chromatographic evaluation revealed that ZnO nanowires showed a stronger intermolecular interaction with phenylphosphoric acid than any other monosubstituted benzene. Furthermore, ZnO nanowires specifically recognized the phosphate groups present in nucleotides even in the aqueous mobile phase, and the intermolecular interaction increased with the number of phosphate groups. This discrimination of phosphate groups in nucleotides was unique to the rich (101̄0) m-plane of ZnO nanowires with a moderate hydrophilicity and negative charge. The discrimination could be evidenced by the changes in the infrared bands of the phosphate groups on nucleotides on ZnO nanowires. Finally, as an application of the molecular recognition, nucleotides were separated by the number of phosphate groups, utilizing optimized gradient elution on ZnO nanowire column. Thus, the present results elucidate the unique and versatile molecular selectivity of well-known ZnO nanostructures for the capture and separation of biomolecules.

DOI： 10.1039/d1na00865j

Scopus

出版者・発行元：Advanced Materials Technologies  

Although temperature modulation of a single (nonselective) semiconductor gas sensor has demonstrated its great capability on discriminating gas molecules, quantitative analysis of the type and concentration of structurally similar volatile organic compounds (VOCs) molecules remains a significant challenge. In this work, as an alternative to a single oxide sensor, sensor arrays composed of four types of NiO-based sensor synchronously perform thermal modulation with a unique programmed cooling temperature profile. Apart from improved category discrimination by using entire sensor arrays, the peak temperature of the temperature profile plays an important role in distinguishing the concentration difference induced by subtle variations of the electrical responses. A high peak temperature of ≈300 °C facilitates concentration discrimination (with an accuracy ratio of 85.9%). This work highlights the importance of the peak temperature in (simultaneous) quantitative analysis of the types and concentrations of VOCs molecules with similar properties.

DOI： 10.1002/admt.202100762

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Sensors  

Humidity and moisture effects, frequently called water poisoning, in surroundings are inevitable for various molecular sensing devices, strongly affecting their sensing characteristics. Here, we demonstrate a water-selective nanostructured dehumidifier composed of ZnO/TiO(2)/CaCl(2) core-shell heterostructured nanowires for molecular sensing spaces. The fabricated nanostructured dehumidifier is highly water-selective without detrimental adsorptions of various volatile organic compound molecules and can be repeatedly operated. The thermally controllable and reversible dehydration process of CaCl(2).nH(2)O thin nanolayers on hydrophilic ZnO/TiO(2) nanowire surfaces plays a vital role in such water-selective and repeatable dehumidifying operations. Furthermore, the limitation of detection for sensing acetone and nonanal molecules in the presence of moisture (relative humidity approximately 90%) was improved more than 20 times using nanocomposite sensors by operating the developed nanostructured dehumidifier. Thus, the proposed water-selective nanostructured dehumidifier offers a rational strategy and platform to overcome water poisoning issues for various molecular and gas sensors.

DOI： 10.1021/acssensors.1c02378

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PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Sensors  

We propose a rational strategy to fabricate thermally robust, highly integrated molecular and gas sensors utilizing a lateral SnO(2) nanofilm channel geometry on a 1024 crossbar sensor array. The proposed lateral channel geometry substantially suppresses the detrimental effects of parasitic interconnect wire resistances compared with those of a conventional vertical sandwich-type crossbar array because of its excellent resistance controllability. A conductive oxide top-contact electrode on the lateral SnO(2) nanofilm channel enhances the thermal stability at temperatures of up to 500 degrees C in ambient air. Integrating this lateral SnO(2) nanofilm geometry with analog circuits enables the operation of a 1024 crossbar sensor array without selector devices to avoid sneak currents. The developed 1024 crossbar sensor array system detects the local spatial distribution of the molecular gas concentration. The spatial data of molecular concentrations include molecule-specific data to distinguish various volatile molecules based on their vapor pressures. Thus, this integrated crossbar sensor array system using lateral nanofilm geometry offers a platform for robust, reliable, highly integrated molecular and gas sensors.

DOI： 10.1021/acssensors.1c02173

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PubMed

記述言語：英語   出版者・発行元：Interdisciplinary Graduate School of Engineering Sciences, Kyushu University  

Conventional odor discrimination is generally performed by gas chromatography–mass spectrometry (GC–MS) that identifies specific marker molecules. Such marker identification process is, however, labor-intensive, and the limited number of identified marker molecules is often insufficient to discriminate complex odors. In this study, we have demonstrated a facile method for discriminating complex odors with GC–MS data by combining texture image analysis (TIA) and machine learning (ML). We extracted various texture features (i.e., contrast, energy, homogeneity, correlation, dissimilarity and angular second moment) of two-dimensional (2D) MS maps by TIA, and used them as datasets for ML. Each texture feature contains a lot of molecular information appeared in 2D MS maps, and thus serves as an effective parameter for discriminating complex odors. Based on this method, we successfully performed the discrimination of breath samples collected from the persons of different blood glucose levels with higher performances and reliability than the conventional approach.

DOI： 10.15017/4763159

CiNii Research

記述言語：英語   出版者・発行元：Interdisciplinary Graduate School of Engineering Sciences, Kyushu University  

Ultraviolet (UV) irradiation is a promising approach for enhancing a sensing response in metal oxide-based molecular sensor, however, its substantial impact on the molecular-to-surface interaction at sensor surface is poorly understood. In this study, we investigated the UV irradiation effect on adsorption state of volatile aldehyde at single crystalline zinc oxide (ZnO) nanowire surface by Fourier transform-infrared spectroscopy (FT-IR). A C9 aliphatic aldehyde, nonanal, was employed as an analyte. We found that oxidation of adsorbed nonanal was significantly promoted by the UV irradiation. A wavelength dependence implied that the photogenerated carriers play a crucial role in the enhanced oxidation. Our finding would be beneficial for designing the performances of metal oxide nanowire-based molecular sensing devices.

DOI： 10.15017/4763158

CiNii Research

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acssensors.1c02378​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We propose a rational strategy to fabricate thermally robust, highly integrated molecular and gas sensors utilizing a lateral SnO2 nanofilm channel geometry on a 1024 crossbar sensor array. The proposed lateral channel geometry substantially suppresses the detrimental effects of parasitic interconnect wire resistances compared with those of a conventional vertical sandwich-type crossbar array because of its excellent resistance controllability. A conductive oxide top-contact electrode on the lateral SnO2 nanofilm channel enhances the thermal stability at temperatures of up to 500 °C in ambient air. Integrating this lateral SnO2 nanofilm geometry with analog circuits enables the operation of a 1024 crossbar sensor array without selector devices to avoid sneak currents. The developed 1024 crossbar sensor array system detects the local spatial distribution of the molecular gas concentration. The spatial data of molecular concentrations include molecule-specific data to distinguish various volatile molecules based on their vapor pressures. Thus, this integrated crossbar sensor array system using lateral nanofilm geometry offers a platform for robust, reliable, highly integrated molecular and gas sensors.

DOI： 10.1021/acssensors.1c02173​

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Omega  

Understanding the formation process of self-assembled monolayers (SAMs) of organophosphonic acids on ZnO surfaces is essential to designing their various applications, including solar cells, heterogeneous catalysts, and molecular sensors. Here, we report the significant effect of surface dissociation on SAM formation of organophosphonic acids on single-crystalline ZnO nanowire surfaces using infrared spectroscopy. When employing the most conventional solvent-methanol (relative permittivity er = 32.6), the production of undesired byproducts (layered zinc compounds) on the surface was identified by infrared spectral data and microscopy. On the other hand, a well-defined SAM structure with a tridentate coordination of phosphonic acids on the surface was confirmed when employing toluene (epsilon(r) = 2.379) or tert-butyl alcohol (epsilon(r) = 11.22-11.50). The observation of layered zinc compounds as byproducts highlights that the degree of Zn2+ dissociation from the ZnO solid surface into a solvent significantly affects the surface coordination of phosphonic acids during the SAM formation process. Although the ZnO nanowire surface (m-plane) is hydrophilic, the present results suggest that a weaker solvent polarity is preferred to form well-defined phosphonic acid SAMs on ZnO nanowire surfaces without detrimental surface byproducts.

DOI： 10.1021/acsomega.1c06183

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsami.0c16108

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acssensors.1c01704

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/admt.202100762​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/admt.202100762​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.analchem.1c03163

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2116/analsci.20P421

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsaelm.1c00428

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/mi12060642

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.langmuir.1c00106​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/d1sc00729g​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsami.0c22709​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsaelm.0c01052

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/chemosensors9020041

その他リンク： ​https://www.mdpi.com/2227-9040/9/2/41

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/D0TA11287A​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/smll.202006860

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/d0ay02138e

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3389/fmicb.2020.581571 ​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： org/10.1021/acsami.0c16108

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsanm.0c02194

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.jpcc.0c05490​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsami.0c10332​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsnano.0c03101​ ​

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s43246-020-00063-5

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsaelm.0c00321

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/mi11060610

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1246/cl.200480

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2116/analsci.20N002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/c9nr10565d

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-019-50641-y

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.nanolett.9b02932

記述言語：英語   掲載種別：研究論文（学術雑誌）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1109/TED.2019.2945932

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsami.9b01287

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsnano.8b08959

記述言語：英語   掲載種別：研究論文（学術雑誌）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.nanolett.7b01362

記述言語：英語   掲載種別：研究論文（学術雑誌）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1126/sciadv.1701133

記述言語：英語  

DOI： 10.1126/sciadv.1701133

記述言語：英語  

DOI： 10.1021/acssensors.8b00045

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記述言語：英語  

DOI： 10.1246/cl.171139

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-017-17443-6

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