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Anal Chem

Title:		Strain-tunable chemiresistor
Author(s):		Read DH; Martin JE;
Address:		"Department of Nanomaterials Sciences, Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1415, USA. dhread@sandia.gov"
Journal Title:		Anal Chem
Year:		2010
Volume:		82
Issue:		5
Page Number:		2150 - 2154
DOI:		10.1021/ac902897e
ISSN/ISBN:		1520-6882 (Electronic) 0003-2700 (Linking)
Abstract:		"We have developed a resistance-based chemical sensor (chemiresistor) for volatile organic compounds whose sensitivity can be reversibly increased over a range of nearly 2 decades by the application of tensile strain. This polymer-based sensor is comprised of Au-plated magnetic particles structured into conducting chains by the application of a magnetic field during the curing of the prepolymer resin. The resistance of this field-structured composite increases when an analyte vapor swells the polymer and reduces the contact pressure between particles. We have found that applying a tensile strain increases both the sensor resistance and sensitivity, as defined by its relative resistance change. This increase in sensitivity is a smooth, continuous function of the applied strain, and the effect is fully reversible. Sensitivity tuning enables the response curve of the sensor to be dynamically optimized for sensing analytes over a wide concentration range"
Keywords:
Notes:		"PubMed-not-MEDLINERead, Douglas H Martin, James E eng 2010/02/12 Anal Chem. 2010 Mar 1; 82(5):2150-4. doi: 10.1021/ac902897e"