Minimal layer graphene/TiO2 nanotube membranes used for enhancement of UV photodetectors

•Titanium Dioxide (TiO2) Nanotubes and graphene/TiO2 were fabricated by anodization.•Enhancement of photocurrent in graphene/TiO2 NT devices was observed.•There higher responsivity of the graphene/TiO2 NT devices as compared with pure-TiO2 NT devices.•Heterojunction of graphene/TiO2 NT devices show...

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Bibliographic Details
Published in:Materials letters 2018-05, Vol.218, p.274-279
Main Authors: Noothongkaew, Suttinart, Thumthan, Orathai, An, Ki-Seok
Format: Article
Language:English
Subjects:
Graphene
Nanotubes
Titanium oxide
Ultraviolet photodetectors
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Summary:•Titanium Dioxide (TiO2) Nanotubes and graphene/TiO2 were fabricated by anodization.•Enhancement of photocurrent in graphene/TiO2 NT devices was observed.•There higher responsivity of the graphene/TiO2 NT devices as compared with pure-TiO2 NT devices.•Heterojunction of graphene/TiO2 NT devices show a good promise for UV photodetectors. Vertically aligned titanium dioxide (TiO2) nanotubes (NTs) and graphene/TiO2 NTs were fabricated on transparent substrate by anodization of Ti foil. TiO2 NTs in anatase phase with and without graphene films coated on their surface were confirmed by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Raman spectra. Enhancement of photocurrent and good responsivity of the graphene/TiO2 NT devices were observed as compared with pure-TiO2 NT devices. At the interface, the electrons will transfer from TiO2 to graphene due to the difference in energy levels of the two materials. The heterojunction was formed there, and the photo-excited electron-hole pairs could hinder the charge recombination. The graphene/TiO2 NT devices have high potential for ultraviolet (UV) photodetectors with the possibility to fine-tune properties, and it is worth of further investigation.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.02.033