High-pressure triggered quantum tunneling tuning through classical percolation in a single nanowire of a binary composite
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In the era of miniaturization, the one-dimensional nanostructures presented numerous possibilities to realize operational nanosensors and devices by tuning their electrical transport properties. Upon size reduction, the physical properties of materials become extremely challenging to characterize and understand due to the complex interplay among structures, surface properties, strain effects, distribution of grains, and their internal coupling mechanism. In this report, we demonstrate the fabrication of a single metal-carbon composite nanowire inside a diamond-anvil-cell and examine the in situ pressure-driven electrical transport properties. The nanowire manifests a rapid and reversible pressure dependence of the strong nonlinear electrical conductivity with significant zero-bias differential conduction revealing a quantum tunneling dominant carrier transport mechanism. We fully rationalize our observations on the basis of a metal-carbon framework in a highly compressed nanowire corroborating a quantum-tunneling boundary, in addition to a classical percolation boundary that exists beyond the percolation threshold. The structural phase progressions were monitored to evidence the pressure-induced shape reconstruction of the metallic grains and modification of their intergrain interactions for successful explanation of the electrical transport behavior. The pronounced sensitivity of electrical conductivity to an external pressure stimulus provides a rationale to design low-dimensional advanced pressure sensing devices.
Keywordssingle metal-carbon nanowire high pressure electrical transport Voronoi diagram
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This work was mainly supported by the National Natural Science Foundation of China (No. 11874076), the National Science Associated Funding (NSAF) (No. U1530402), and Science Challenging Program (No. TZ2016001). S. S. would also like to thank Dr. Christophe Thissieu from Almax easyLab Inc, MA, Cambridge, USA for providing the designer diamond anvils for the experiments. S. S. would like to thank Dr. Ankita Ghatak, S. N. Bose National Centre for Basic Sciences, Kolkata, India for the analysis and discussion on HRTEM data.
- https://doi.org/www.almax-easylab.com/WebsitePatternedAnvils01.aspx. [Dear author, please complete this ref.,thanks]
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