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Enhanced field emission properties of Au/SnSe nano-heterostructure: a combined experimental and theoretical investigation

Rondiya, Sachin R., Jadhav, Chandradip D., Chavan, Padmakar G. and Dzade, Nelson Y. 2020. Enhanced field emission properties of Au/SnSe nano-heterostructure: a combined experimental and theoretical investigation. Scientific Reports 10 , 2358. 10.1038/s41598-020-58840-8

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Abstract

We report the field emission properties of two-dimensional SnSe nanosheets (NSs) and Au/SnSe nano-heterostructure (NHS) prepared by a simple and economical route of one-pot colloidal and sputtering technique. Field Emission Scanning Electron Microscope (FESEM) analysis reveal surface protrusions and morphology modification of the SnSe NSs by Au deposition. By decorating the SnSe NSs with Au nanoparticles, significant improvement in field emission characteristics were observed. A significant reduction in the turn-on field from 2.25 V/µm for the SnSe NSs to 1.25 V/µm for the Au/SnSe NHS was observed. Emission current density of 300 µA/cm2 has been achieved at an applied field of 4.00 and 1.91 V/µm for SnSe NSs and Au/SnSe NHS, respectively. Analysis of the emission current as a function of time also demonstrated the robustness of the present Au/SnSe NHS. Consistent with the experimental data, our complementary first-principles DFT calculations predict lower work function for the Au/SnSe NHS compared to the SnSe NSs as the primary origin for improved field emission. The present study has evidently provided a rational heterostructure strategy for improving various field emission related applications via surface and electronic modifications of the nanostructures.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Nature Publishing Group
ISSN: 2045-2322
Funders: EPSRC
Date of First Compliant Deposit: 13 February 2020
Date of Acceptance: 17 January 2020
Last Modified: 06 Aug 2020 10:46
URI: http://orca-mwe.cf.ac.uk/id/eprint/129612

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