TY - GEN
T1 - Phase-mode LAPS and its application to chemical imaging
AU - Miyamoto, K.
AU - Wagner, T.
AU - Yoshinobu, T.
AU - Kanoh, S.
AU - Schöning, M. J.
PY - 2009
Y1 - 2009
N2 - The light-addressable potentiometric sensor (LAPS) is a chemical sensor based on the field effect in the electrolyte - insulator - semiconductor (EIS) structure. In the conventional LAPS, the ion concentration in the analyte solution is determined by measuring the amplitude of the photocurrent induced by illumination of a modulated light. In this study, we developed the phase-mode LAPS, in which the phase of the alternating photocurrent is measured instead of its amplitude. The phase - voltage curve shifted along the voltage axis in response to the variation of ion concentration, in analogy to the shift of the current - voltage curve in the conventional LAPS. The primary advantage of the phase-mode LAPS is that it is much less sensitive to the fluctuation of the light intensity. It is also demonstrated that chemical imaging based on the phase-mode LAPS is almost free from artifacts related to defects in the semiconductor substrate.
AB - The light-addressable potentiometric sensor (LAPS) is a chemical sensor based on the field effect in the electrolyte - insulator - semiconductor (EIS) structure. In the conventional LAPS, the ion concentration in the analyte solution is determined by measuring the amplitude of the photocurrent induced by illumination of a modulated light. In this study, we developed the phase-mode LAPS, in which the phase of the alternating photocurrent is measured instead of its amplitude. The phase - voltage curve shifted along the voltage axis in response to the variation of ion concentration, in analogy to the shift of the current - voltage curve in the conventional LAPS. The primary advantage of the phase-mode LAPS is that it is much less sensitive to the fluctuation of the light intensity. It is also demonstrated that chemical imaging based on the phase-mode LAPS is almost free from artifacts related to defects in the semiconductor substrate.
KW - Chemical imaging sensor
KW - Light-addressable potentiometric sensor (LAPS)
UR - http://www.scopus.com/inward/record.url?scp=71449116185&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=71449116185&partnerID=8YFLogxK
U2 - 10.1109/SENSOR.2009.5285704
DO - 10.1109/SENSOR.2009.5285704
M3 - Conference contribution
AN - SCOPUS:71449116185
SN - 9781424441938
T3 - TRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems
SP - 1842
EP - 1845
BT - TRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems
T2 - TRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems
Y2 - 21 June 2009 through 25 June 2009
ER -