Chemically sensitive surface acoustic wave devices employing a self-assembled composite monolayer film: molecular specificity and effects due to self-assembled monolayer adsorption time and gold surface morphology
- Sandia National Lab., Albuquerque, NM (United States)
- Texas A&M Univ., College Station, TX (United States)
The selectivity, sensitivity, and reproducibility of SAW chemical sensors functionalized with a carboxylate-coordinated Cu{sup 2+}-terminated surface are examined in relation to the interfacial properties of these organomercaptan self-assembled monolayer (SAM) films, prepared from the solution phase for adsorption times of 36, 84, or 180 h on Au surfaces having variable, controlled grain sizes. SAM adsorption time and the grain size of the Au film can dramatically affect the response to adsorption from the vapor phase onto the composite monolayer-modified SAW device. It is proposed that the varied response results from differences in molecular packing and, particularly, in the ordering of the end groups of the monolayer film that provide the chemically sensitive interface. These studies provide an important step toward reliably fabricating chemical sensors that respond to specific classes of organic analytes. 46 refs., 7 figs.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 252932
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 9 Vol. 12; ISSN 0743-7463; ISSN LANGD5
- Country of Publication:
- United States
- Language:
- English
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