Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 208, Issue -, Pages 406-414Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.10.138
Keywords
Flower-like alpha-MoO3; Hierarchical structure; Triethylamine sensor; 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 [B201101, B201414]
- Heilongjiang Educational Department [2013TD002, 2011CJHB006, 12531506]
- Youth Foundation of Harbin [2013RFQXJ142]
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Novel flower-like alpha-MoO(3)with hierarchical structure was synthesized via a facile solvothermal route without any surfactant or template, and subsequent calcination at 400 degrees C in air for 2 h. The alpha-MoO3 flowers with the diameters about 3-5 mu m consist of microrods with average diameters of 150-200 nm growing radially from the center of the hierarchical flower-like structure, and the microrods are assembled from nanoplates. The sensors based on alpha-MoO3 flowers are highly sensitive and distinctively selective to triethylamine (TEA). The response of this sensor to 100 ppm TEA attains 416 and the detection limit is 0.5 ppm at the operating temperature of 250 degrees C. The change of the surface status of alpha-MoO3 flowers before and after exposure to TEA at 250 degrees C was investigated by using XPS technique and the TEA sensing mechanism over alpha-MoO(3)was proposed. (C) 2014 Elsevier B.V. All rights reserved.
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