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Enhanced piezoelectric effect at the edges of stepped molybdenum disulfide nanosheets

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Abstract

The development of piezoelectric layered materials may be one of the key elements enabling expansion of nanotechnology, as they offer a solution for the construction of efficient transducers for a wide range of applications, including self-powered devices. Here, we investigate the piezoelectric effect in multilayer (ML) stepped MoS2 flakes obtained by liquid-phase exfoliation, which is especially interesting because it may allow the scalable fabrication of electronic devices using large area deposition techniques (e.g. solution casting, spray coating, inkjet printing). By using a conductive atomic force microscope we map the piezoelectricity of the MoS2 flakes at the nanoscale. Our experiments demonstrate the presence of electrical current densities above 100 A cm−2 when the flakes are strained in the absence of bias, and the current increases proportional to the bias. Simultaneously collected topographic and current maps demonstrate that the edges of stepped ML MoS2 flakes promote the piezoelectric effect, where the largest currents are observed. Density functional theory calculations are consistent with the ring-like piezoelectric potential generated when the flakes are strained, as well as the enhanced piezoelectric effect at edges. Our results pave the way to the design of piezoelectric devices using layered materials.

Graphical abstract: Enhanced piezoelectric effect at the edges of stepped molybdenum disulfide nanosheets

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Publication details

The article was received on 29 Nov 2016, accepted on 21 Feb 2017 and first published on 23 Feb 2017


Article type: Communication
DOI: 10.1039/C6NR09275F
Citation: Nanoscale, 2017, Advance Article
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    Enhanced piezoelectric effect at the edges of stepped molybdenum disulfide nanosheets

    X. Song, F. Hui, K. Gilmore, B. Wang, G. Jing, Z. Fan, E. Grustan-Gutierrez, Y. Shi, L. Lombardi, S. A. Hodge, A. C. Ferrari and M. Lanza, Nanoscale, 2017, Advance Article , DOI: 10.1039/C6NR09275F

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