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Title: Vapor detection using resonating microcantilevers

Abstract

Changes in the resonance frequency of microcantilevers due to adsorption of analyte vapor on exposed surfaces is shown to provide a novel means for detection of the analyte. Frequency changes can be due to mass loading or adsorption-induced changes in cantilever spring constant. Sensitization to water vapor is demonstrated by coating cantilever surfaces with hygroscopic materials, such as phosphoric acid. Cantilevers coated with a thin gelatin film exhibit high sensitivity and a linear response with changes in relative humidity, apparently due to changes in the spring constant of the coated cantilever. In addition to frequency response, static cantilever deflection also changes with vapor adsorption. Both phenomena can be used to detect adsorbed vapors with picogram mass resolution. 19 refs., 2 figs.

Authors:
; ; ; ;  [1]
  1. Oak Ridge National Lab., TN (United States)
Publication Date:
OSTI Identifier:
6564427
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Journal Article
Journal Name:
Analytical Chemistry (Washington); (United States)
Additional Journal Information:
Journal Volume: 67:3; Journal ID: ISSN 0003-2700
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MEASURING INSTRUMENTS; SENSITIVITY; VAPORS; MICROANALYSIS; WATER VAPOR; COATINGS; DETECTION; FREQUENCY MEASUREMENT; GELATIN; MICROBALANCES; PHOSPHORIC ACID; BALANCES; COLLOIDS; DISPERSIONS; FLUIDS; GASES; HYDROGEN COMPOUNDS; INORGANIC ACIDS; ORGANIC COMPOUNDS; PROTEINS; WEIGHT INDICATORS; 400201* - Chemical & Physicochemical Properties

Citation Formats

Thundat, T, Chen, G Y, Warmack, R J, Allison, D P, and Wachter, E A. Vapor detection using resonating microcantilevers. United States: N. p., 1995. Web. doi:10.1021/ac00099a006.
Thundat, T, Chen, G Y, Warmack, R J, Allison, D P, & Wachter, E A. Vapor detection using resonating microcantilevers. United States. https://doi.org/10.1021/ac00099a006
Thundat, T, Chen, G Y, Warmack, R J, Allison, D P, and Wachter, E A. Wed . "Vapor detection using resonating microcantilevers". United States. https://doi.org/10.1021/ac00099a006.
@article{osti_6564427,
title = {Vapor detection using resonating microcantilevers},
author = {Thundat, T and Chen, G Y and Warmack, R J and Allison, D P and Wachter, E A},
abstractNote = {Changes in the resonance frequency of microcantilevers due to adsorption of analyte vapor on exposed surfaces is shown to provide a novel means for detection of the analyte. Frequency changes can be due to mass loading or adsorption-induced changes in cantilever spring constant. Sensitization to water vapor is demonstrated by coating cantilever surfaces with hygroscopic materials, such as phosphoric acid. Cantilevers coated with a thin gelatin film exhibit high sensitivity and a linear response with changes in relative humidity, apparently due to changes in the spring constant of the coated cantilever. In addition to frequency response, static cantilever deflection also changes with vapor adsorption. Both phenomena can be used to detect adsorbed vapors with picogram mass resolution. 19 refs., 2 figs.},
doi = {10.1021/ac00099a006},
url = {https://www.osti.gov/biblio/6564427}, journal = {Analytical Chemistry (Washington); (United States)},
issn = {0003-2700},
number = ,
volume = 67:3,
place = {United States},
year = {1995},
month = {2}
}