Electrochemical synthesis of ultrafast and gram-scale surfactant-free tellurium nanowires by gas–solid transformation and their applications as supercapacitor electrodes for p-doping of graphene transistors

Tsai, H.W. and Yaghoubi, A. and Chan, T.C. and Wang, C.C. and Liu, W.T. and Liao, C.N. and Lu, S.Y. and Chen, L.J. and Chueh, Y.L. (2015) Electrochemical synthesis of ultrafast and gram-scale surfactant-free tellurium nanowires by gas–solid transformation and their applications as supercapacitor electrodes for p-doping of graphene transistors. Nanoscale, 7 (17). pp. 7535-7539. ISSN 2040-3364

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Official URL: http://dx.doi.org/10.1039/c5nr00876j

Abstract

We herein report a gas-solid transformation mechanism for the surfactant-free synthesis of Te NWs at room temperature by electrolysis of bulk Bi2Te3 using H2Te gas. Te NWs, with an average diameter below 20 nm, grow along the [001] direction due to the unique spiral chains in the crystal structure and show an enhanced Raman scattering effect, a broad absorption band over the range of 350-750 nm and an emission band over the range of 400-700 nm in the photoluminescence spectrum. In terms of device applications, we demonstrate how Te NWs can be directly applied as a p-type dopant source in order to shift the Dirac point in ambipolar field effect graphene transistors. Finally, the favorable capacitive properties of Te NWs are established as supercapacitor electrodes with negligible internal resistance and excellent electrochemical reversibility and a specific capacitance of 24 F g-1.

Item Type: Article
Uncontrolled Keywords: Absorption spectroscopy; Capacitors; Crystal structure; Doping (additives); Electrodes; Electrolytic capacitors; Field effect transistors; Graphene; Nanowires; Photoluminescence spectroscopy; Surface active agents; Tellurium compounds
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 02 Oct 2018 03:55
Last Modified: 02 Oct 2018 03:55
URI: http://eprints.um.edu.my/id/eprint/19529

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