Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1690196 | Vacuum | 2015 | 6 Pages |
Abstract
The light-addressable potentiometric sensor (LAPS) is a kind of semiconductor-based label-free sensor that is capable of visualizing two-dimensional distribution chemical concentrations above the sensor surface. This report presents a new scanning methodology for the LAPS-based chemical imaging sensor system where an analog micromirror combined with a laser was used as a flexible light-addressing platform. In this set-up, the scanning area and the scanning spatiotemporal resolution can be modified in a user-defined program in a personal computer. This new scanning method can provide a 'zoom-in' applicability to deliver high-resolution chemical images at a desired location. The entire surface of the sensor can be scanned within a few seconds to generate the initial low resolution image; then the area of interest can be selected and scanned with slow speed to produce an image with higher spatial information. The Photo-response-reference bias voltage characteristic, pH-sensitivity and also the chemical imaging of uniform pH buffer solutions are successfully demonstrated with this setup.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Anirban Das, Chia-Ming Yang, Tsung-Cheng Chen, Chao-Sung Lai,