High-sensitivity light-addressable potentiometric sensors using silicon on sapphire functionalized with self-assembled organic monolayers

Wang, Jian; Zhou, Yinglin; Watkinson, Michael; Gautrot, Julien; Krause, Steffi

Abstract

The use of self-assembled organic monolayers as the insulator in light-addressable potentiometric sensors (LAPS) is shown for the first time. Silicon on sapphire (SOS) substrates were modified with 1-octadecene or undecylenic acid. Experiments with a photoresist pattern as the model system showed the same good spatial resolution that was previously obtained with a conventional insulator on SOS, but also a significant improvement in the photocurrent contrast and therefore the sensitivity of LAPS. Surface potential imaging was validated by studying micropatterns of poly(allylamine hydrochloride) (PAH) and DNA on a PAH template using LAPS. The results showed that self-assembled organic monolayers provide an excellent, reproducible, ultrathin insulator for LAPS, which can be readily functionalized and used for high-sensitivity LAPS imaging and sensing.

Citation

Wang, J., Zhou, Y., Watkinson, M., Gautrot, J., & Krause, S. (2015). High-sensitivity light-addressable potentiometric sensors using silicon on sapphire functionalized with self-assembled organic monolayers. Sensors and Actuators B: Chemicall, 209, 230-236. https://doi.org/10.1016/j.snb.2014.11.071

• Journal Article Type: Article
• Acceptance Date: Nov 12, 2014
• Online Publication Date: Nov 26, 2014
• Publication Date: 2015-03
• Deposit Date: Jun 15, 2023
• Journal: Sensors and Actuators B: Chemical
• Print ISSN: 0925-4005
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 209
• Pages: 230-236
• DOI: https://doi.org/10.1016/j.snb.2014.11.071
• Keywords: Materials Chemistry; Electrical and Electronic Engineering; Metals and Alloys; Surfaces, Coatings and Films; Condensed Matter Physics; Instrumentation; Electronic, Optical and Magnetic Materials
• Additional Information: This article is maintained by: Elsevier; Article Title: High-sensitivity light-addressable potentiometric sensors using silicon on sapphire functionalized with self-assembled organic monolayers; Journal Title: Sensors and Actuators B: Chemical; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.snb.2014.11.071; Content Type: article; Copyright: Copyright © 2014 Elsevier B.V. All rights reserved.