A novel composite film for detection and molecular weight determination of organic vapors

Bishnu P. Regmi, Joshua Monk, Bilal El-Zahab, Susmita Das, Francisco R. Hung, Daniel J. Hayes, Isiah M. Warner

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

A novel vapor-sensitive composite film comprising cellulose acetate and a representative compound (1-n-butyl-2,3-dimethylimidazolium hexafluorophosphate) from a Group of Uniform Materials Based on Organic Salts (GUMBOS) has been developed and characterized. The vapor sensing characteristics of the film is investigated using a quartz crystal microbalance (QCM) transducer. The material exhibited greatly improved performance characteristics toward a number of organic vapors. It is demonstrated that the ratio of the change in resonance frequency (Δf) to the change in motional resistance (ΔR) is a concentration-independent quantity proportional to the molecular weight of the absorbed chemical species. To the best of our knowledge, this is the first study to show a direct relationship between Δf/ΔR and the molecular weight of analytes. This unique finding should prove extremely useful for easy identification and molecular weight determination of a broad range of chemical vapors.

Original languageEnglish (US)
Pages (from-to)13732-13741
Number of pages10
JournalJournal of Materials Chemistry
Volume22
Issue number27
DOIs
StatePublished - Jul 21 2012

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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