Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 209, Issue -, Pages 230-236Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.11.071
Keywords
Light addressable potentiometric sensors; Scanning photo-induced impedance microscopy; Self-assembled monolayers; Undecylenic acid
Funding
- China Scholarship Council
- EU [MIF1-CT-2005-007808, PIRSES-GA-2009-247641]
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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. (C) 2014 Elsevier B.V. All rights reserved.
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