Metal nano-film resistivity chemical sensor

0449176 - ÚIACH 2016 RIV DE eng J - Journal Article
Podešva, Pavel - Foret, František
Metal nano-film resistivity chemical sensor.
Electrophoresis. Roč. 37, č. 3 (2016), s. 392-397. ISSN 0173-0835. E-ISSN 1522-2683
R&D Projects: GA ČR(CZ) GBP206/12/G014
Institutional support: RVO:68081715
Keywords : adsorption * chemiresistor * nano-film * thiol binding * thiol sensing
Subject RIV: CB - Analytical Chemistry, Separation
Impact factor: 2.744, year: 2016

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.
Permanent Link: http://hdl.handle.net/11104/0250752