TY  - JOUR
A1  - Miyamoto, Koichiro
A1  - Seki, Kosuke
A1  - Suto, Takeyuki
A1  - Werner, Frederik
A1  - Wagner, Torsten
A1  - Schöning, Michael Josef
A1  - Yoshinobu, Tatsuo
T1  - Improved spatial resolution of the chemical imaging sensor with a hybrid illumination that suppresses lateral diffusion of photocarriers
JF  - Sensor and Actuators B: Chemical
N2  - The chemical imaging sensor is a semiconductor-based chemical sensor capable of visualizing pH and ion distributions. The spatial resolution depends on the lateral diffusion of photocarriers generated by illumination of the semiconductor substrate. In this study, two types of optical setups, one based on a bundle of optical fibers and the other based on a binocular tube head, were developed to project a hybrid illumination of a modulated light beam and a ring-shaped constant illumination onto the sensor plate. An improved spatial resolution was realized by the ring-shaped constant illumination, which suppressed lateral diffusion of photocarriers by enhanced recombination due to the increased carrier concentration.
Y1  - 2018
U6  - http://dx.doi.org/10.1016/j.snb.2018.07.016
SN  - 0925-4005
VL  - 273
SP  - 1328
EP  - 1333
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-ichiro
A1  - Yu, Bing
A1  - Isoda, Hiroko
A1  - Wagner, Torsten
A1  - Schöning, Michael Josef
A1  - Yoshinobu, Tatsuo
T1  - Visualization of the recovery process of defects in a cultured cell layer by chemical imaging sensor
JF  - Sensors and Actuators B: Chemical
N2  - The chemical imaging sensor is a field-effect sensor which is able to visualize both the distribution of ions (in LAPS mode) and the distribution of impedance (in SPIM mode) in the sample. In this study, a novel cell assay is proposed, in which the chemical imaging sensor operated in SPIM mode is applied to monitor the recovery of defects in a cell layer brought into proximity of the sensing surface. A reduced impedance at a defect formed artificially in a cell layer was successfully visualized in a photocurrent image. The cell layer was cultured over two weeks, during which the temporal change of the photocurrent distribution corresponding to the recovery of the defect was observed.
Y1  - 2016
U6  - http://dx.doi.org/10.1016/j.snb.2016.04.018
SN  - 0925-4005
VL  - 236
SP  - 965
EP  - 969
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-ichiro
A1  - Yoshida, Midori
A1  - Sakai, Taito
A1  - Matsuzaka, Atsushi
A1  - Wagner, Torsten
A1  - Kanoh, Sanoh
A1  - Yoshinobu, Tatsuo
A1  - Schöning, Michael Josef
T1  - Differential setup of light-addressable potentiometric sensor with an enzyme reactor in a flow channel
JF  - Japanese Journal of Applied Physics. 50 (2011)
Y1  - 2011
SN  - 0021-4922
SP  - 04DL08-1
EP  - 04DL08-5
PB  - Japan Society of Applied Physics
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-ichiro
A1  - Wagner, Torsten
A1  - Yoshinobu, Tatsuo
A1  - Kanoh, Shin`ichiro
A1  - Schöning, Michael Josef
T1  - Phase-mode LAPS and its application to chemical imaging
JF  - Sensors and Actuators B: Chemical. 154 (2011), H. 1
Y1  - 2011
SN  - 1873-3077
SP  - 28
EP  - 32
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-ichiro
A1  - Wagner, Torsten
A1  - Yoshinobu, Tatsuo
A1  - Kanoh, Shin`ichiro
A1  - Schöning, Michael Josef
T1  - Phase-mode operation of FDM-LAPS
JF  - Sensor letters
Y1  - 2011
SN  - 1546-1971
VL  - 9
IS  - 2
SP  - 691
EP  - 694
PB  - American Scientific Publishers
CY  - Stevenson Ranch, Calif.
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-ichiro
A1  - Wagner, Torsten
A1  - Mimura, Shuhei
A1  - Kanoh, Shiníchiro
A1  - Yoshinobu, Tatsuo
A1  - Schöning, Michael Josef
T1  - Constant-phase-mode operation of the light-addressable potentiometric sensor
JF  - Sensors and Actuators B: Chemical. 154 (2011), H. 2
Y1  - 2011
SN  - 1873-3077
N1  - EUROSENSORS XXIII
SP  - 119
EP  - 123
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-ichiro
A1  - Wagner, Torsten
A1  - Mimura, Shuhei
A1  - Kanoh, Shin`ichiro
A1  - Yoshinobu, Tatsuo
A1  - Schöning, Michael Josef
T1  - Constant-phase-mode operation of the light-addressable potentiometric sensor
JF  - Procedia Chemistry. 1 (2009), H. 1
Y1  - 2009
SN  - 1876-6196
N1  - Proceedings of the Eurosensors XXIII conference ; Eurosensors 23
SP  - 1487
EP  - 1490
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Miyamoto, Ko-ichiro
A1  - Suto, Takeyuki
A1  - Werner, Frederik
A1  - Wagner, Torsten
A1  - Schöning, Michael Josef
A1  - Yoshinobu, Tatsuo
T1  - Restraining the Diffusion of Photocarriers to Improve the Spatial Resolution of the Chemical Imaging Sensor
T2  - MDPI Proceedings
Y1  - 2017
U6  - http://dx.doi.org/10.3390/proceedings1040477
N1  - Eurosensors 2017 Conference, Paris, France, 3–6 September 2017
VL  - 1
IS  - 4
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-ichiro
A1  - Sugawara, Yuri
A1  - Kanoh, Shin´ichiro
A1  - Yoshinobu, Tatsuo
A1  - Wagner, Torsten
A1  - Schöning, Michael Josef
T1  - Image correction method for the chemical imaging sensor
JF  - Sensors and Actuators B: Chemical. 144 (2010), H. 2
Y1  - 2010
N1  - 22nd International Conference on Eurosensors - Dresden, Germany, 7-10 September 2008 ; Eurosensors ; (22, 2008, Dresden)
SP  - 344
EP  - 348
ER  - 
TY  - JOUR
A1  - Miyamoto, Ko-Ichiro
A1  - Sato, Takuya
A1  - Abe, Minami
A1  - Wagner, Torsten
A1  - Schöning, Michael Josef
A1  - Yoshinobu, Tatsuo
T1  - Light-addressable potentiometric sensor as a sensing element in plug-based microfluidic devices
JF  - Micromachines
N2  - A plug-based microfluidic system based on the principle of the light-addressable potentiometric sensor (LAPS) is proposed. The LAPS is a semiconductor-based chemical sensor, which has a free addressability of the measurement point on the sensing surface. By combining a microfluidic device and LAPS, ion sensing can be performed anywhere inside the microfluidic channel. In this study, the sample solution to be measured was introduced into the channel in a form of a plug with a volume in the range of microliters. Taking advantage of the light-addressability, the position of the plug could be monitored and pneumatically controlled. With the developed system, the pH value of a plug with a volume down to 400 nL could be measured. As an example of plug-based operation, two plugs were merged in the channel, and the pH change was detected by differential measurement.
KW  - light-addressable potentiometric sensor
KW  - plug-based microfluidic device
KW  - chemical sensor
Y1  - 2016
U6  - http://dx.doi.org/10.3390/mi7070111
SN  - 2072-666X
N1  - This article belongs to the Special Issue "Micro/Nano Devices for Chemical Analysis"
VL  - 7
IS  - 7
SP  - 111
PB  - MDPI
CY  - Basel
ER  -