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Type: Journal article
Title: Electromigration with enhanced green emission in the titanium dioxide nanotube/graphene composite
Author: Nguyen, T.T.
Tung, T.T.
Losic, D.
Lan Anh, L.T.
Phuc, L.H.
Nguyen, X.S.
Citation: Current Applied Physics, 2019; 19(10):1082-1087
Publisher: Elsevier
Issue Date: 2019
ISSN: 1567-1739
Statement of
Tri Tuan Nguyen, Tran Thanh Tung, Dusan Losic, Luu Thi Lan Anh, Le Hong Phuc, Xuan Sang Nguyen
Abstract: One of the most studied photoluminescence emission peaks of anatase titanium dioxide (TiO2) is green, located at about 520 nm, which is assigned to the radiative recombination between a mobile electron in the conduction band and oxygen vacancy defect as a trapped hole in the bandgap. Composite materials of TiO2 with graphene are normally shown by the gradual quenching of photoluminescence intensity as a result of carrier lifetime extension, which is important to enhance photocatalytic activity. Herein we report an observation of the intensity enhancement of the green PL emission in a composite TiO2 nanotube (TNT) and graphene produced through facile hydrothermal synthesis. The heterojunction formation of graphene and TNT makes the excited photoelectrons easy to diffuse from TNT to graphene. Hence, the recombination rate of mobile electrons in graphene and trapped holes located on the nanotube surface is enhanced due to the high mobility of electrons in graphene.
Keywords: Titanium dioxide nanotube; graphene; green emission; photoluminescence; electromigration
Rights: © 2019 Korean Physical Society. Published by Elsevier B.V. All rights reserved.
DOI: 10.1016/j.cap.2019.06.008
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