Polyelectrolytes as coatings for chemical sensors: A quartz crystal microbalance and surface-enhanced Raman spectroscopic study
- Iowa State Univ., Ames, IA (United States)
- Florida Sate Univ., Tallahassee, FL (United States)
The Quartz Crystal Microbalance (QCM) has emerged as an important, compact, and low-cost detection technique with real-time continuous monitoring capabilities. Efforts to gain selectivity for applications of QCMs as chemical sensors often strive to take advantage of the specificity of the interactions of thin layers of polymeric materials with target analytes. In this presentation, the application of polyelectrolytes (PE) or water soluble polymers as QCM coatings for nitrous oxide detection is described. The goal is to test whether the unique differences (e.g., ion/dipole and/or ion/induced-dipole interactions) of the interactions of these materials offer any advantages to detection over more conventional water insoluble polymers. Our preliminary results reveal that PE-coatings (e.g., poly(vinyl benzyl trimethyl ammonium chloride) and polyvinylpyrrolidone) for nitrous oxide detection exhibit improved performance over many conventional polymers (e.g., polysiloxane). Further, a marked advantage of ionic PEs over neutral PEs is observed. The response preferences of the PE coatings to nitrous oxide have been established and mode of the interactions upon nitrous oxide uptake will be discussed. Characterization of PEs formed by adsorption from dilute aqueous solutions onto metallic surfaces (i.e., gold and silver) has also been undertaken using surface-enhanced Raman spectroscopy. Details related to the affinity of various PEs at these metals and interactions with the nitrous oxide and other analytes are also examined.
- OSTI ID:
- 126095
- Report Number(s):
- CONF-950402-; TRN: 95:006086-0064
- Resource Relation:
- Conference: 209. American Chemical Society (ACS) national meeting, Anaheim, CA (United States), 2-6 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of 209th ACS national meeting; PB: 2088 p.
- Country of Publication:
- United States
- Language:
- English
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