Lateral resolution enhancement of pulse-driven light-addressable potentiometric sensor

Carl Frederik Werner, Ko ichiro Miyamoto, Torsten Wagner, Michael J. Schöning, Tatsuo Yoshinobu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

To study chemical and biological processes, spatially resolved determination of the concentrations of one or more analyte species is of distinct interest. With a light-addressable potentiometric sensor (LAPS), chemical images can be created, which visualize the concentration distribution above the sensor plate. One important challenge is to achieve a good lateral resolution in order to detect events that take place in a small and limited region. LAPS utilizes a focused light spot to address the measurement region. By moving this light spot along the semiconductor sensor plate, the concentration distribution can be observed. In this study, we show that utilizing a pulse as light excitation instead of a traditionally used continuously modulated light excitation, the lateral resolution can be improved by a factor of 6 or more.

Original languageEnglish
Pages (from-to)961-965
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume248
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • Chemical images
  • LAPS
  • Light-addressable potentiometric sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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