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Author Rih-Sheng Jian ♦ Lung-Yu Sung ♦ Chia-Jung Tsai ♦ Chia-Jung Lu
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2011
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Sensors ♦ Gold ♦ Transducers ♦ Films ♦ Photonic crystals ♦ Magnetic materials ♦ Sensitivity
Abstract This research reports a series of monolayer-protected gold nano-clusters (MPCs) with various organo-thiolate groups capped and coated onto both chemiresistor (CR) and quartz crystal microbalance (QCM) transducers as chemical sensors for the detection of airborne volatile organic compounds (VOCs). The three thiolates that were used to encapsulate nano-gold were 1-octanethiol (Au-C8), 4-tert-butylbenzenethiol (Au-TBT), and a mixture of both (Au-C8TBT). The vapor responses using MPC sensing film on both QCM and CR transducers were rapid, reversible, and linear $(R^{2}$ > 0.99). The Au-C8-coated sensors represented the well known sensing behavior, which holds that sorption mass and resistance changes are correlated. The Au-TBT sensor showed the opposite—a high sorption mass for a QCM signal but virtually no change in resistance for CR. This result contradicts the conventional belief that the degree of resistance change is proportional to the absorbed mass. The mixed-ligand Au-C8TBT film showed alternative vapor selectivity for both CR and QCM transducers that deviated from both Au-C8 and Au-TBT film. The chemical structures of the mechanisms for vapor selectivity for two different transducers were investigated and are discussed here.
Description Author affiliation: Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan (Chia-Jung Tsai) || Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan (Rih-Sheng Jian; Lung-Yu Sung; Chia-Jung Lu)
ISBN 9781424492909
ISSN 19300395
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-10-28
Publisher Place Ireland
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
e-ISBN 9781424492893
Size (in Bytes) 949.33 kB
Page Count 4
Starting Page 732
Ending Page 735


Source: IEEE Xplore Digital Library