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http://dx.doi.org/10.12989/sss.2011.8.5.471

In situ reduction of gold nanoparticles in PDMS matrices and applications for large strain sensing  

Ryu, Donghyeon (Department of Civil & Environmental Engineering, University of California)
Loh, Kenneth J. (Department of Civil & Environmental Engineering, University of California)
Ireland, Robert (Northern California Nanotechnology Center (NC2), University of California)
Karimzada, Mohammad (Northern California Nanotechnology Center (NC2), University of California)
Yaghmaie, Frank (Northern California Nanotechnology Center (NC2), University of California)
Gusman, Andrea M. (Northern California Nanotechnology Center (NC2), University of California)
Publication Information
Smart Structures and Systems / v.8, no.5, 2011 , pp. 471-486 More about this Journal
Abstract
Various types of strain sensors have been developed and widely used in the field for monitoring the mechanical deformation of structures. However, conventional strain sensors are not suited for measuring large strains associated with impact damage and local crack propagation. In addition, strain sensors are resistive-type transducers, which mean that the sensors require an external electrical or power source. In this study, a gold nanoparticle (GNP)-based polymer composite is proposed for large strain sensing. Fabrication of the composites relies on a novel and simple in situ GNP reduction technique that is performed directly within the elastomeric poly(dimethyl siloxane) (PDMS) matrix. First, the reducing and stabilizing capacities of PDMS constituents and mixtures are evaluated via visual observation, ultraviolet-visible (UV-Vis) spectroscopy, and transmission electron microscopy. The large strain sensing capacity of the GNP-PDMS thin film is then validated by correlating changes in thin film optical properties (e.g., maximum UV-Vis light absorption) with applied tensile strains. Also, the composite's strain sensing performance (e.g., sensitivity and sensing range) is also characterized with respect to gold chloride concentrations within the PDMS mixture.
Keywords
Beer-Lambert law; gold nanoparticles; nanocomposites; PDMS; strain sensing; thin film;
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