In an effort to impart selectivity to chem. These coatings influenced the response of the micro-cantilever to vapor phase test analytes of varying chem. Sensitivity improved as both film thickness and cantilever leg thickness were decreased. The selectivity, as indicated by differences in relative responses to the test analytes, were different for the two phases which differed significantly in polarity. The SP-2340 coated cantilevers exhibited response characteristics that are fairly similar to that expected for adsorption of the test analytes onto silica.
Responses are proportional to analyte concn.
Response characteristics are consistent with predictions based on a gas chromatog.