Enhanced piezoelectric effect at the edges of stepped molybdenum disulfide nanosheets

Xiaoxue Song, Fei Hui, Keith Gilmore, Bingru Wang, Guangyin Jing, Zhongchao Fan, Enric Grustan-Gutierrez, Yuanyuan Shi, Lucia Lombardi, Stephen A. Hodge, Andrea C. Ferrari, Mario Lanza

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)6237-6245
Number of pages9
JournalNanoscale
Volume9
Issue number19
DOIs
StatePublished - May 21 2017
Externally publishedYes

Fingerprint

Dive into the research topics of 'Enhanced piezoelectric effect at the edges of stepped molybdenum disulfide nanosheets'. Together they form a unique fingerprint.

Cite this