期刊
IEEE ELECTRON DEVICE LETTERS
卷 37, 期 5, 页码 656-659出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2016.2544954
关键词
TiO2 nanotubes; RGO; hybrid junction; methanol sensor; room temperature; fast response
资金
- Visvesvaraya Young Faculty Research Fellowship (DeitY, India)
- Department of Science and Technology-NM, India
- Indian National Science Academy
- CSIR, Government of India
In this letter, a highly efficient room-temperature gas-sensor device based on the hybrid structure of TiO2 nanotubes and reduced graphene oxide (RGO) is reported. TiO2 NTs were grown by the electrochemical anodization technique followed by the electro-deposition of RGO layer in the form of discrete islands. The synergistic hybridization of the two different sensing elements was found to be superior to the performance of the individual ones. Room temperature (similar to 27 degrees C) gas-sensing performance, with methanol as a test species, was carried out and the fastest response and recovery times, reported so far, were achieved due to high carrier mobility of RGO. On the other hand, appreciably high response magnitude (96.93% at 800 ppm) was obtained due to the increased number of gas-interaction sites and availability of free surface energy provided by titania nanotubes and RGO. A comparative discussion elucidating the role of TiO2 NTs-RGO junctions has also been presented co-relating the experimental findings.
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