期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 279, 期 -, 页码 69-78出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.09.095
关键词
3D carbon nanostructures; Toluene gas sensor; Pillared graphene; Sparking method; TiO2 decoration
资金
- (TRF-KURDI Research Career Development Grant) from Thailand Research Fund
- Kasetsart University Research and Development Institute [RSA6180062]
- Graduate School, Kasetsart University
- National Research Council of Thailand (NRCT)
This work presents a highly sensitive room-temperature gas sensor based on 3D titanium dioxide/graphene-carbon nanotube (3D TiO2/G-CNT) fabricated by chemical vapor deposition and sparking methods. Characterizations by scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and Transmission electron microscopy confirmed the formation of 3D graphene-carbon nanotube nanostructures decorated with TiO2 nanoparticles. The toluene detection performances of 3D TiO2/G-CNT structures with varying Ti sparking times were investigated in comparison with 3D G-CNT, TiO2-CNT, graphene and CNTs at room temperature. From result, the optimal sparking time of 60 s led to an optimal sensor response of 42%-500 ppm at room temperature. In addition, the optimal 3D TiO2/G-CNT exhibited substantially higher toluene response, sensitivity and selectivity than 3D G-CNT, TiO2-CNT, graphene and CNTs over a low concentration range of 50-500 ppm. The toluene-sensing mechanisms of 3D titanium dioxide/graphene-carbon nanotube nanostructures were proposed based on the formation of Schottky metal-semiconductor junctions between metallic 3D graphene-carbon nanotube structures and n-type semiconducting titanium dioxide nanoparticles due to the adsorption of toluene molecules via low-temperature reducing reactions or direct charge transfer process.
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