Phase-mode LAPS and its application to chemical imaging

K. Miyamoto, Torsten Wagner, T. Yoshinobu, S. Kanoh, M. J. Schöning

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationTRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems
Pages1842-1845
Number of pages4
DOIs
Publication statusPublished - 2009 Dec 11
EventTRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems - Denver, CO, United States
Duration: 2009 Jun 212009 Jun 25

Publication series

NameTRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems

Other

OtherTRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems
CountryUnited States
CityDenver, CO
Period09/6/2109/6/25

Keywords

  • Chemical imaging sensor
  • Light-addressable potentiometric sensor (LAPS)

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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