TY - JOUR
T1 - Chemical sensor based on microfabricated wristwatch tuning forks
AU - Ren, Minghan
AU - Forzani, Erica
AU - Tao, Nongjian
PY - 2005/5/1
Y1 - 2005/5/1
N2 - We report here a chemical sensor based on detecting the mechanical response of a thin (∼10-μm) polymer wire stretched across the two prongs of a wristwatch quartz tuning fork (QTF). When the fork is set to oscillate, the wire is stretched and compressed by the two prongs. The stretching/compression force changes upon adsorption of analyte molecules onto/into the polymer wire, which is detected by the QTF with pico-Newton force sensitivity. An array of such sensors with different polymer wires is used for simultaneous detection of several analytes and for improvement of pattern recognition. The low cost (∼10¢) of the QTF, together with that an array of QTFs can be driven to oscillate simultaneously and their resonance frequencies detected with the same circuit, promises a high performance, low cost, and portable sensor for detecting various chemical vapors. We demonstrate here detection of parts-per-billion-level water, ethylnitrobenzene, and ethanol vapors using the QTF arrays.
AB - We report here a chemical sensor based on detecting the mechanical response of a thin (∼10-μm) polymer wire stretched across the two prongs of a wristwatch quartz tuning fork (QTF). When the fork is set to oscillate, the wire is stretched and compressed by the two prongs. The stretching/compression force changes upon adsorption of analyte molecules onto/into the polymer wire, which is detected by the QTF with pico-Newton force sensitivity. An array of such sensors with different polymer wires is used for simultaneous detection of several analytes and for improvement of pattern recognition. The low cost (∼10¢) of the QTF, together with that an array of QTFs can be driven to oscillate simultaneously and their resonance frequencies detected with the same circuit, promises a high performance, low cost, and portable sensor for detecting various chemical vapors. We demonstrate here detection of parts-per-billion-level water, ethylnitrobenzene, and ethanol vapors using the QTF arrays.
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U2 - 10.1021/ac048320e
DO - 10.1021/ac048320e
M3 - Article
C2 - 15859583
AN - SCOPUS:18144405735
SN - 0003-2700
VL - 77
SP - 2700
EP - 2707
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 9
ER -