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Chemosensors 2014, 2(1), 85-96;

The Shell Structure Effect on the Vapor Selectivity of Monolayer-Protected Gold Nanoparticle Sensors

Department of Chemistry, Fu-Jen Catholic University, New Taipei 24205, Taiwan
Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan
Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan
Authors to whom correspondence should be addressed.
Received: 12 December 2013 / Revised: 22 January 2014 / Accepted: 7 February 2014 / Published: 28 February 2014
(This article belongs to the Special Issue Nanosensors)
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Four types of monolayer-protected gold nanoclusters (MPCs) were synthesized and characterized as active layers of vapor sensors. An interdigitated microelectrode (IDE) and quartz crystal microbalance (QCM) were used to measure the electrical resistance and mass loading changes of MPC films during vapor sorption. The vapor sensing selectivity was influenced by the ligand structure of the monolayer on the surface of gold nanoparticles. The responses of MPC-coated QCM were mainly determined according to the affinity between the vapors and surface ligands of MPCs. The responses to the resistance changes of the MPC films were due to the effectiveness of the swelling when vapor was absorbed. It was observed that resistive sensitivity to polar organics could be greatly enhanced when the MPC contained ligands that contain interior polar functional groups with exterior nonpolar groups. This finding reveals that reducing interparticle attraction by using non-polar exterior groups could increase effective swelling and therefore enhance the sensitivity of MPC-coated chemiresistors. View Full-Text
Keywords: gold nanoparticles; VOC sensors; chemiresistor; QCM gold nanoparticles; VOC sensors; chemiresistor; QCM

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Huang, R.-X.; Lu, C.-J.; Tian, W.-C. The Shell Structure Effect on the Vapor Selectivity of Monolayer-Protected Gold Nanoparticle Sensors. Chemosensors 2014, 2, 85-96.

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