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Metal nano-film resistivity chemical sensor
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SYSNO ASEP 0449176 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Metal nano-film resistivity chemical sensor Author(s) Podešva, Pavel (UIACH-O)
Foret, František (UIACH-O) RID, ORCIDNumber of authors 2 Source Title Electrophoresis. - : Wiley - ISSN 0173-0835
Roč. 37, č. 3 (2016), s. 392-397Number of pages 6 s. Publication form Print - P Language eng - English Country DE - Germany Keywords adsorption ; chemiresistor ; nano-film ; thiol binding ; thiol sensing Subject RIV CB - Analytical Chemistry, Separation R&D Projects GBP206/12/G014 GA ČR - Czech Science Foundation (CSF) Institutional support UIACH-O - RVO:68081715 UT WOS 000369959400002 EID SCOPUS 84957852148 DOI 10.1002/elps.201500190 Annotation In this work, we present a study on reusable thin metal film resistivity-based sensor for direct measurement of binding of thiol containing molecules in liquid samples. While in bulk conductors the DC current is not influenced by the surface events to a measureable degree in a thin metal layer the electrons close to the surface conduct a significant part of electricity and are influenced by the surface interactions. In this study, the thickness of the gold layer was kept below 100 nm resulting in easily measureable resistivity changes of the metal element upon a surface SH-groups binding. No further surface modifications were necessary. Thin film gold layers deposited on a glass substrate by vacuum sputtering were photolithographically structured into four sensing elements arranged in a Wheatstone bridge to compensate for resistance fluctuations due to the temperature changes. Concentrations as low 100 pM provided measureable signals. The surface after the measurement could be electrolytically regenerated for next measurements. Workplace Institute of Analytical Chemistry Contact Iveta Drobníková, drobnikova@iach.cz, Tel.: 532 290 234 Year of Publishing 2016
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