Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7146054 | Sensors and Actuators B: Chemical | 2015 | 7 Pages |
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.
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Authors
Jian Wang, Yinglin Zhou, Michael Watkinson, Julien Gautrot, Steffi Krause,