Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 205, Issue -, Pages 322-328Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.08.092
Keywords
TEA sensing; Gas sensor; TiO2; Nanorod arrays; In situ growth; Sensing mechanism
Funding
- National Natural Science Foundation of China [61271126, 21201060, 21305033]
- Program for Innovative Research Team in University [IRT-1237]
- Program for Science and Technology Project of Heilongjiang Province [WB12A101]
- Heilongjiang Educational Department [2013TD002, 2011CJHB006, 12541613]
- Youth Foundation of Harbin [2013RFQXJ142]
- Heilongjiang Postdoctoral [LBHZ11045]
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A TiO2 nanoparticle (TP) film is employed as a seed layer for the hydrothermal growth of single crystalline rutile TiO2 nanorod arrays on the substrate. The TP films were prepared by dip coating method from the TiO2 sols. The TiO2 nanorods are smooth with the average diameter of similar to 65 nm and the length of 1 mu m. The nanorods consist of parallel tiny nanotips about 3-5 nm in diameter on the top surface of the stem nanorod. Morphological evolutions versus reaction time were explored in detail through a series of SEM and XRD characterizations. The results indicated that the size of the rods increased with the reaction time increasing. A thin film sensor was formed from different sizes of single crystalline rutile TiO2 nanorod arrays growing on a ceramic tube in situ and exhibited an improved triethylamine sensing performance with a fast response of 2s and a detection limit of 0.1 ppm. The experiment results show that the TiO2 nanorod arrays are a kind of promising material for detecting trace TEA. 2014 Elsevier B.V. All rights reserved.
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