Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.35848/1347-4065/acb4fa

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/s41528-022-00168-6

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/s21165546

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1128/MRA.00393-21

Language：Others   Publishing type：Research paper (scientific journal)  

Chemiresistor sensor matrix prepared by full-printing processes
Herein, we report a novel full printing process for fabricating chemiresistor gas sensor matrixes on photographic paper with an inkjet printer. Sensor matrices, which can increase a number of sensors significantly compared to a serial sensor array, were printed on one piece of A4 photographic paper. Each sensor matrix contains 36 interdigital electrodes in an area of less than 11 mm2, which greatly improves the density of the sensor. The basic architecture of the sensor matrix is electrodes that row and column intersecting. In order to insulate the row and column electrodes from meeting each other, an insulating layer needs to be fabricated at the point of intersection between the row and column electrodes. The insulation layer was produced by adjusting the number of printing passes and shape of the printing pattern of color pigment ink. Carbon black (CB) was used to form a chemosensitive composite by changing its resistivity with a specific polymer for the preparation of sensing material. In order to make the sensing material can be printed, it is necessary to disperse CB first. CB was dispersed in aqueous solution with sodium dodecyl sulfate added as a surfactant to lower the surface tension, which enabled printing of CB using an inkjet printer. Some polymers have certain adsorption characteristics for gases. According to the different gas properties, the adsorption characteristics are also different. By adding polyethylene glycol polymer to the CB layer, the response to four gases with different properties is improved. Compared with the drop coating, the full-printing sensors not only reduces the production time significantly, but also improves the gas response magnitude to ethanol by about three times. The results demonstrate that the developed sensor can be used as a low cost, disposable, and easily printable chemical sensor.

DOI： 10.1088/2058-8585/abec19

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/SENSORS47125.2020.9278605

Language：Others   Publishing type：Research paper (other academic)  

2D LSPR gas sensor with Au/Ag core-shell structure coated by fluorescent dyes
LSPR (Localized Surface Plasmon Resonance) based 2D (Two-dimensional) gas sensor system which can measure and identify multi-gases with high spatial resolution have been developed. The gas sensor detects optical changes promoted by the gas on the LSPR substrate with hyperspectral camera. Basically, LSPR gas sensor does not have a molecular selectivity, then the identification of gas species is difficult. To overcome the disadvantage, LSPR substrates based on Au/Ag core-shell structure with spectral gas-discriminating ability through optical interaction were fabricated by spin coating fluorescent dyes. Using the LSPR coupled with fluorescent dyes, this sensor provides rich spectral information about the detecting molecules and can discriminates gas species.

DOI： 10.1109/SENSORS47125.2020.9278828

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/SENSORS47125.2020.9278909

Language：English  

Microfabricated electrochemical sensing devices
Electrochemistry provides possibilities to realize smart microdevices of the next generation with high functionalities. Electrodes, which constitute major components of electrochemical devices, can be formed by various microfabrication techniques, and integration of the same (or different) components for that purpose is not difficult. Merging this technique with microfluidics can further expand the areas of application of the resultant devices. To augment the development of next generation devices, it will be beneficial to review recent technological trends in this field and clarify the directions required for moving forward. Even when limiting the discussion to electrochemical microdevices, a variety of useful techniques should be considered. Therefore, in this review, we attempted to provide an overview of all relevant techniques in this context in the hope that it can provide useful comprehensive information.

DOI： 10.1039/c9lc01112a

Language：Others   Publishing type：Research paper (other academic)  

2D LSPR multi gas sensor array with 4-segmented subpixel using Au/Ag core shell structure
LSPR (Localized Surface Plasmon Resonance) based 2D (2 Dimensional) gas imaging sensor system which can capture spatial distribution of each constituent of mixed gas have been developed. The gas image sensor detects the gas promoted optical changes occurred on the LSPR substrate by CCD camera. Basically, LSPR gas sensor does not have a molecular selectivity, then the identification of gas species is difficult. To overcome the disadvantage, pixelated LSPR substrate based on Au/Ag core-shell structure which has different gas response properties is fabricated by photo-induced metal growth by mask-less exposure system using a commercial video projector.

DOI： 10.1109/SENSORS43011.2019.8956635

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/SENSORS43011.2019.8956884

Language：Others   Publishing type：Research paper (other academic)  

Invisible Odor Trace Tracking with LSPR based High Speed Gas Sensor Robot System
Various odor robots have been developed for finding gas sources. However, the response speed of sensors is now a major limit for the promotion of odor robot using chemical substances information. In this research, we have developed a robot equipped with two LSPR (Localized Surface Plasmon Resonance) gas sensor module that can quickly respond to gas molecules at a high speed of above 25 Hz and set a specific algorithm for tracking the invisible odor line on the ground.

DOI： 10.1109/SENSORS43011.2019.8956599

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/SENSORS43011.2019.8956795

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/TRANSDUCERS.2019.8808512

Language：Others   Publishing type：Research paper (other academic)  

Odor Trace Visualization by Mobile Robot Equipped with Two-Dimensional LSPR Gas Sensor
This paper presents a Localized Surface Plasmon Resonance (LSPR) based high speed gas sensor module for gas sensing applications, including visualization of invisible odor trail. Innovative claims include: (1) the use of a double layer film with Au/Ag nanoparticles for gas detection; (2) high speed response characteristic; and (3) visualization of odor trail pattern with high spatial resolution. The results show a significant change in reflection light with ethanol vapor; response speed of 1 second; and a clear image of visualized odor trail of letter "Q" of a 3 mm line width.

DOI： 10.1109/TRANSDUCERS.2019.8808400

Language：Others   Publishing type：Research paper (other academic)  

Gas Visualization with Photo-Induced 2D Pixel Patterned Au/Ag Core-Shell LSPR Imaging Device by Mask-Less Exposure System
Visualization of the distribution of various gases makes us possible to recognize environmental circumstances, e.g., localization of dangerous chemical sources or human body odorants in the case of disaster scene. Localized surface plasmon resonance (LSPR) can detect various gases with changes of surrounding dielectric constant, and can be used gas sensor with high response / recovery speed and high spatial resolution, i.e., 2 dimensional LSPR gas sensor gas work as a gas image sensor device. The gas image sensor detects the gas distribution occurred on the LSPR substrate by an ordinal image sensor. The general LSPR gas sensor, however, does not have a molecular selectivity, then the identification of gas species is difficult. To overcome such disadvantages, pixelated LSPR substrate based on Au/Ag core-shell structure is fabricated by photo-induced growth by mask-less exposure system using a commercial video projector.

DOI： 10.1109/TRANSDUCERS.2019.8808591

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ISOEN.2019.8823230

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ISOEN.2019.8823375

Language：Others   Publishing type：Research paper (other academic)  

Probe gas sensing system based on reflected light detection from localized surface plasmon resonance
The present study explored a probe type gas detection system which can be used to detect the gas conveniently. The gas sensing mechanism is utilizing Localized Surface Plasmon Resonance (LSPR) sensor which based on the reflected light change caused by the refractive index changes of gas where exposing to the metal nanoparticles layer. The LSPR layer was prepared by vacuum sputtering of AuNPs on a glass substrate, growing in silver growth solution and consequently thermal annealing. An optical system which composed of fiber probe, light source and spectrometer was developed to detect the change of reflected light. It was found that compared with incident light irradiating from metal nanoparticles side, glass side could obtain clearer spectra peak. In addition, a LSPR sensor which had 5 hours silver growth time has the best response to acetic acid gas. This work demonstrated that the reflection detection system has a great potential in gas detecting area.

DOI： 10.1109/ISOEN.2019.8823157

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ISOEN.2019.8823275

Language：Others  

DOI： 10.1016/B978-0-12-815409-0.00018-8

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ICSENS.2018.8589830

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ICSENS.2018.8589909

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ICSENS.2018.8589717

Language：English   Publishing type：Research paper (scientific journal)  

A robot equipped with a high-speed LSPR gas sensor module for collecting spatial odor information from on-ground invisible odor sources
Improving the efficiency of detecting the spatial distribution of gas information with a mobile robot is a great challenge that requires rapid sample collection, which is basically determined by the speed of operation of gas sensors. The present work developed a robot equipped with a highspeed gas sensor module based on localized surface plasmon resonance. The sensor module is designed to sample gases from an on-ground odor source, such as a footprint material or artificial odor marker, via a fine sampling tubing. The tip of the sampling tubing was placed close to the ground to reduce the sampling time and the effect of natural gas diffusion. On-ground ethanol odor sources were detected by the robot at high resolution (i.e., 2.5 cm when the robot moved at 10 cm/s), and the reading of gas information was demonstrated experimentally. This work may help in the development of environmental sensing robots, such as the development of odor source mapping and multirobot systems with pheromone tracing.

DOI： 10.1021/acssensors.8b00214

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.snb.2017.11.128

Language：Others   Publishing type：Research paper (other academic)  

Odorants measurement using hyperspectral imaging and PVC film including multi fluorescent probes
Odor imaging sensor was developed with odorants sensing mechanism based on the complicated fluorescence interactions between the multi-fluorescent-probes and odorants. In this research, poly vinyl chloride (PVC) films including various fluorescent probe were developed, and fluorescence properties of the film were investigated. Using the multi fluorescent probe film, fluorescence intensity change spectrum to various odorants was measured, and odorants could be clustered by their chemical structure by multi-variate analyses of hyper spectra images.

DOI： 10.1109/ICSENS.2017.8234328

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/TRANSDUCERS.2017.7994313

Language：Others   Publishing type：Research paper (scientific journal)  

Review of Microfluidic Devices for On-Chip Chemical Sensing
Microfluidic techniques can be a basis to realize user-friendly microanalytical devices of high performance. Required operations include injection of solutions to reaction chambers, volume measurement, and mixing of solutions. For this purpose, the use of surface tension is attractive. In hydrophobic flow channels, solutions can be moved stably in the form of plugs. Otherwise, solutions can be transported by capillary action in a hydrophilic flow channel and stopped at a hydrophobic valve. The valve can be opened autonomously by switching the mixed potential by wetting a zinc electrode formed in a controlling flow channel. In this review paper, we introduce some of our microfluidic devices particularly focusing on devices that work based on surface tension.

DOI： 10.1002/ecj.11944

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ICSENS.2016.7808850

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ICSENS.2016.7808604

Language：Others   Publishing type：Research paper (other academic)  

DOI： 10.1109/ICSENS.2016.7808660

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/s16111974

Language：English   Publishing type：Research paper (scientific journal)  

Microfluidic Separation of Redox Reactions for Coulometry Based on Metallization at the Mixed Potential
Coulometric detection of an analyte in a solution at nanoliter scale was conducted by having redox reactions proceed simultaneously on a platinum electrode. The analyte was oxidized on a part of the electrode in one flow channel and silver was deposited on an array of circular microelectrodes formed in another flow channel at a mixed potential. Coulometric determination of the deposited silver showed a steep change in the generated charge as a result of the complete oxidation of silver. The short measurement time after the start of the coulometry suppressed the increase in background charge, resulting in significant lowering of the detection limit. The lower detection limit for H O was 30 nM (3σ). To improve selectivity and minimize the influence of coexisting interferents, the shifting of the mixed potential, application of a permselective membrane, and electrochemical elimination of the interferents were effective modifications. 2 2

DOI： 10.1021/acs.analchem.6b01234

Language：Others   Publishing type：Research paper (scientific journal)  

Electrochemical Bubble-Based Bidirectional Microfluidic Transport
With the aim of application to biochemical analyses, efficient bidirectional microfluidic transport was achieved through the reversible electrochemical production and shrinkage of hydrogen bubbles. A three-electrode system with a platinum black working electrode, a Ag/AgCl reference electrode, and a platinum auxiliary electrode was incorporated into a poly(dimethylsiloxane) structure containing the necessary flow channels and compartments. The influence of the electrode and flow channel structures on the operation of the system was investigated. The production and shrinkage of bubbles was achieved by applying appropriate potentials to the working electrode, which minimized the influence of spontaneous shrinkage resulting from the oxidizing effect of dissolved oxygen. Device performance depended on the structure of the working electrode, meaning that further optimization will be necessary. The device was shown to withdraw solution through a minimally invasive needle and to process liquid plugs in a microfluidic system.

DOI： 10.1021/acssensors.5b00059

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.precisioneng.2013.05.008

Language：Others   Publishing type：Research paper (scientific journal)  

Droplet-based microfluidic sensing system for rapid fish freshness determination
A microfluidic device was constructed for on-site determination of fish freshness by using adenosine-5′-triphosphate (ATP) concentration as an indicator of freshness. In the device, extracts from fish and reagent solutions were processed in the form of droplets separated by air. The volumes of the droplets of the extract solution, a solution containing enzyme substrates, and a washing buffer solution were measured in branched flow channels. To simplify the structure and procedure for mixing solutions, a wider portion was formed in one flow channel to merge the droplets. A row of droplets was ejected from each of three branched flow channels, merged in the wider portion, and transported to a sensing region located downstream. ATP was detected using two enzymatic reactions involving glycerol kinase (GK) and glycerol-3-phosphate oxidase (G3PO). A linear relationship between the generated current and ATP concentration was confirmed, and ATP detection from jack mackerel extracts was carried out. A distinct change in the current was observed with the fresh extracts as in the case of standard solutions. The obtained data correlated well with those obtained by high-performance liquid chromatography (HPLC). © 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.snb.2012.05.043

Language：Others   Publishing type：Research paper (scientific journal)  

Miniaturized shape memory alloy pumps for stepping microfluidic transport
A shape memory alloy (SMA) actuator and a polydimethylsiloxane (PDMS) elastic tube were used to realize a simple pump. A liquid plug in a flow channel could be moved forward and backward reversibly by exploiting the shape memory properties of the actuator. Two SMA sheets were used to create a peristaltic pump capable of moving a solution forward and backward over a long distance. The stepping transport caused by applying pulses of electric power facilitated the adjustment of the plug's position. Manipulations such as volume measurement and the merging of two plugs were demonstrated using a microfluidic device with a T-junction. © 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.snb.2011.12.085

Language：English   Publishing type：Research paper (scientific journal)  

Coulometric detection of components in liquid plugs by microfabricated flow channel and electrode structures
Coulometry has been demonstrated to be effective for determining the analyte in a liquid plug on the nanoliter-scale confined in a flow channel. A plug prepared in a rhombus structure of an auxiliary flow channel was placed on a thin-film three-electrode system, and hydrogen peroxide was detected as a model analyte. Under a fixed potential, the current decayed rapidly, particularly in shallow flow channels, thus making reproducible amperometric detection difficult. On the other hand, the increasing charge during coulometry facilitated the measurements. A constricted flow channel structure with an array of platinum strips for the working electrode was effective at efficiently consuming the analyte to improve the sensitivity and lower the detection limit. Compared to the case of a single short working electrode with the same area, a 4-fold increase in sensitivity was observed for the best combination of flow channel height and interstrip distance. With an increase in the generated current while maintaining the background at a low level, the detection limit was lowered from 1.3 μM to 410 nM using working electrodes with the same area. Furthermore, the processing of solutions containing l-glutamate or l-glutamate oxidase and the detection of l-glutamate were demonstrated. © 2010 American Chemical Society.

DOI： 10.1021/ac102289a

Language：English   Publishing type：Research paper (scientific journal)  

Engineering of capillary-like structures in tissue constructs by electrochemical detachment of cells
A major challenge in the development of functional thick tissues is the formation of vascular networks for oxygen and nutrient supply throughout the engineered tissue constructs. This study describes an electrochemical approach for fabrication of capillary-like structures, precisely aligned within micrometer distances, whose internal surfaces are covered with vascular endothelial cells. In this approach, an oligopeptide containing a cell adhesion domain (RGD) in the center and cysteine residues at both ends was designed. Cysteine has a thiol group that adsorbs onto a gold surface via a gold-thiolate bond. The cells attached to the gold surface via the oligopeptide were readily and noninvasively detached by applying a negative electrical potential and cleaving the gold-thiolate bond. This approach was applicable not only for a flat surface but also for various configurations, including cylindrical structures. By applying this approach to thin gold rods aligned in a spatially controlled manner in a perfusion culture device, human umbilical vein endothelial cells (HUVECs) were transferred onto the internal surface of capillary structures in collagen gel. In the subsequent perfusion culture, the HUVECs grew into the collagen gel and formed luminal structures, thereby forming vascular networks in vitro. © 2009 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.biomaterials.2009.11.104

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jbiosc.2009.06.013

Language：Others   Publishing type：Research paper (scientific journal)  

Biochip with integrated pumps for plug-based sequential exchange of solutions
A novel method for exchanging solutions used in biochemical analyses and a device to carry out the exchange are proposed. An array of plugs formed using six injectors was transported in a microflow channel using a main pump located at one end of the main flow channel. The injectors and main pump were operated on the basis of the change in volume caused by the electrolysis of water. Bubbles were produced from working electrodes; these bubbles caused a diaphragm placed below the injectors to inflate and occlude the inlet of the solution reservoir. Increase in the number of bubbles caused the reservoir to inject the solution into the main flow channel in the form of a plug. Each plug was individually transported downstream to the sensing area by the main pump, which was operated in a similar manner to the injector. The device was used for the detection of a tumor marker, α-fetoprotein (AFP). Plugs of necessary solutions were individually transported to the sensing area with immobilized primary antibodies to allow antigen-antibody binding, cleaning, and detection. The fluorescence intensity from the antibodies showed clear dependence on the concentration of AFP. The immobilization of antibodies could also be carried out on-chip. © 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.snb.2009.04.048

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/ac800492v

Language：English  

DOI： 10.1002/elps.200700581

Event date： 2019.10

Language：English  

Country：Canada  

Event date： 2019.10

Language：English  

Country：Canada  

Event date： 2019.10

Language：English  

Country：Canada  

Event date： 2019.10

Language：English  

Country：Canada  

Event date： 2019.6

Language：English  

Country：Germany  

Event date： 2019.6

Language：English  

Country：Germany  

Event date： 2019.6

Language：English  

Country：Germany  

Event date： 2019.5

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Country：Japan  

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Country：India  

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Country：India  

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Country：India  

Event date： 2017.10 - 2017.11

Language：English  

Country：United Kingdom  

Event date： 2017.4

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：筑波大学   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：富山大学 五福キャンパス   Country：Japan  

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Venue：富山大学 五福キャンパス   Country：Japan  

Event date： 2017.1

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Venue：九州大学 病院キャンパス   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：対馬市交流センター   Country：Japan  

Event date： 2016.12

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Country：Japan  

Event date： 2016.12

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Venue：対馬市交流センター   Country：Japan  

Event date： 2016.12

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Venue：対馬市交流センター   Country：Japan  

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京電機大学 東京千住キャンパス   Country：Japan  

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：静岡大学浜松キャンパス   Country：Japan  

Event date： 2016.10 - 2016.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Caribe Royale All-Suite Hotel and Convention Center   Country：United States  

Event date： 2016.10 - 2016.11

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2016.10 - 2016.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Caribe Royale All-Suite Hotel and Convention Center   Country：United States  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：平戸文化センター／平戸市未来創造館   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：平戸文化センター／平戸市未来創造館   Country：Japan  

Event date： 2016.10

Language：Japanese  

Venue：平戸文化センター／平戸市未来創造館   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：平戸文化センター／平戸市未来創造館   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宮崎大学   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宮崎大学   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宮崎大学   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宮崎大学   Country：Japan  

Event date： 2016.9

Language：Japanese  

Venue：東京ビッグサイト　東5ホール　センサエキスポジャパン2016展示会場内　セミナーE   Country：Japan  

Event date： 2016.6

Language：Japanese  

Venue：金沢市文化ホール   Country：Japan  

Event date： 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢市文化ホール   Country：Japan  

Event date： 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢市文化ホール   Country：Japan  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.5

Language：English  

Country：Canada  

Event date： 2011.6

Language：English  

Country：China  

Event date： 2011.6

Language：English  

Country：China  

Event date： 2011.6

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Country：China  

Event date： 2009.6

Language：English  

Country：United States  

Event date： 2007.10

Language：English  

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