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Shell-Binary Nanoparticle Materials with Variable Electrical and Electro-mechanical Properties

Abstract

Nanoparticle (NP) materials with the capability to adjust their electrical and electro-mechanical properties facilitate applications in strain sensing technology. Traditional NP materials based on single component NPs are lacking systematic and effective means of tuning their electrical and electro-mechanical properties. Here, we report on a new type of shell-binary NP material fabricated by self-assembly with either homogenous or heterogeneous arrangements of NPs. Variable electrical and electro-mechanical properties were obtained for both materials. We show that the electrical and electro-mechanical properties of these shell-binary NP materials are highly tunable and strongly affected by the NP species as well their corresponding volume fraction ratio. The conductivity and the gauge factor of these shell-binary NP materials can be altered by about five and two orders of magnitude, respectively. These shell-binary NP materials with different arrangements of NPs also demonstrate different volume fraction dependent electro-mechanical properties. The shell-binary NP materials with heterogeneous arrangement of NPs exhibit a peaking of the sensitivity at medium mixing ratios, which arise from the aggregation induced local strain enhancement. Studies on electron transport regimes and micro-morphologies of these shell-binary NP materials revealed the different mechanisms accounting for the variable electrical and electro-mechanical properties. A model based on effective medium theory is used to describe the electrical and electro-mechanical properties of such shell-binary nanomaterials and shows an excellent match with experiment data. These shell-binary NP materials possess great potential applications in high performance strain sensing technology due to their variable electrical and electro-mechanical properties.

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Supplementary files

Publication details

The article was received on 24 Oct 2017, accepted on 04 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR07912E
Citation: Nanoscale, 2017, Accepted Manuscript
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    Shell-Binary Nanoparticle Materials with Variable Electrical and Electro-mechanical Properties

    P. Zhang, H. Bousack, Y. Dai, A. Offenhäusser and D. Mayer, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR07912E

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