Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/75879
Title: Detection of organic solvent vapours and studies of thermodynamic parameters using quartz crystal microbalance sensors modified with siloxane polymers
Authors: Zhang, S.
Li, S.F.Y. 
Keywords: Organic vapour detection
Quartz crystal microbalance
Selective coatings
Siloxane polymers
Issue Date: Nov-1996
Citation: Zhang, S.,Li, S.F.Y. (1996-11). Detection of organic solvent vapours and studies of thermodynamic parameters using quartz crystal microbalance sensors modified with siloxane polymers. Analyst 121 (11) : 1721-1726. ScholarBank@NUS Repository.
Abstract: Quartz crystal microbalance (QCM) sensors mere modified by a series of siloxane polymer coatings, including polydimethyldiphenylsiloxane, polymethylhydrosiloxane and PS-086. These sensors were exposed to different concentrations of various organic solvent molecules, including related chlorinated hydrocarbons, alcohols and other organic vapours. The results showed that the responses of frequency changes to concentration changes exhibited linear relationships within the concentration range studied. The thickness of the above three coatings was in the range 3.04-4.24 nm. Thermodynamic parameters of polymer-gas interactions were determined. Partition coefficients (K) of the modified polysiloxane layers obtained from frequency changes at different concentrations of the detected solvents showed good reproducibility (about 0.77-5.45% relative standard deviation) at room temperature. The selectivity and sensitivity of the polysiloxane-based sensors were correlated with the solvent boiling points, Ostwald solubility coefficients and the different molecular interactions between the functional groups of polysiloxanes and organic solvent molecules.
Source Title: Analyst
URI: http://scholarbank.nus.edu.sg/handle/10635/75879
ISSN: 00032654
Appears in Collections:Staff Publications

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