Research Article

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2014, 7(6): 824–834

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https://doi.org/10.1007/s12274-014-0443-x

Closely packed nanoparticle monolayer as a strain gauge fabricated by convective assembly at a confined angle

Chao Zhang1, Juan Li1, Shanshan Yang1, Weihong Jiao1, Shuang Xiao1, Mingqing Zou1, Songliu Yuan1, Fei Xiao2, Shuai Wang2 (*), and Lihua Qian1 (*

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1 School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China
2 School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

Keywords: convective assembly, strain gauge, contact angle, gold nanoparticles
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  • Abstract
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The reliability and sensitivity of a strain gauge made from a nanoparticle monolayer intrinsically depend on electron tunneling between the adjacent nanoparticles, so that creating nanoscale interstitials with uniform distribution and tuning the interparticle separation reversibly during cyclic mechanical stress are two vital issues for performance enhancement. In this work, one assembly technique is initialized to fabricate parallel nanoparticle strips by precisely tailoring the contact angle of a gold colloid on a substrate. The assembly of a nanoparticle monolayer with a close-packed pattern can be simultaneously switched on and off by independently varying the contact angle across a threshold value of 4.2°. This nanoparticle strip shows a reversible and reliable electrical response even if a mechanical strain as small as 0.027% is periodically supplied, implying well-controlled electron tunneling between the adjacent nanoparticles.
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Closely packed nanoparticle monolayer as a strain gauge fabricated by convective assembly at a confined angle. Nano Res. 2014, 7(6): 824–834 https://doi.org/10.1007/s12274-014-0443-x

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