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Silver Ion Polyelectrolyte Container as a Sensitive Quartz Crystal Microbalance Gas Detector Yosuke Tsuge, Yukari Moriyama, Yuki Tokura, and Seimei Shiratori Anal. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.analchem.6b03387 • Publication Date (Web): 11 Oct 2016 Downloaded from http://pubs.acs.org on October 20, 2016
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Analytical Chemistry
Silver
Ion
Polyelectrolyte
Container
as
a
Sensitive Quartz Crystal Microbalance Gas Detector
Yosuke Tsuge, Yukari Moriyama, Yuki Tokura and Seimei Shiratori*
Department of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522 Japan
ABSTRACT A polyelectrolyte film containing metastable silver ions was applied as quartz crystal microbalance (QCM) gas detector. The polyelectrolyte film was obtained by immersing a polyelectrolyte with numerous amine groups in a metal ion solution. The QCM detector with silver ions responded to a very low methylmercaptan gas concentration (20 ppb), but did not respond to ammonia, volatile amines, aromatic compounds, or alcohols. The response speed of the QCM detector increased gradually with increasing methylmercaptan concentrations. The highly sensitive and selective response is promoted by a ligand substitution reaction caused by the formation of coordinative bonds between a metastable silver ion and amine groups in the polyelectrolyte film. To the best of our knowledge, this system has the highest sensitivity among reported QCM gas detectors. Such high-sensitivity among reported QCM gas detectors. Such high–sensitivity gas
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Analytical Chemistry
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detectors for volatile sulfur compounds have wide ranging applications in areas such as volcanic eruption prediction, food inspection, environmental analysis, and medical diagnostics.
INTRODUCTION Odor compounds emitted from the human body (e.g. skin and oral cavity),1 waste, sewage and refuse treatment facilities,2 and livestock barns3 can be classified into four chemical groups: 1) reduced sulfur compounds (i.e., methylmercaptan and hydrogen sulfide), 2) ammonia and volatile amines, 3) volatile fatty acids (i.e., acetic acid and propionic acid), and 4) aromatic compounds. The olfactory threshold of methylmercaptan (
