Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 202, Issue -, Pages 1010-1018Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.06.040
Keywords
Gallium nitride; Porous structures; Electrospinning; Ethanol sensing properties
Funding
- PCSIRT [IRT1080]
- NNSF of China [51272158]
- Changjiang Scholar Incentive Program [[2009]17]
- Shanghai Nano Special Foundation [11nm0502600]
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Through precursor, subsequent calcination and ammoniation, gallium nitride nanofibers (GaN-NFs) and gallium nitride nanoparticles (GaN-NPs) were synthesized by electrospinning and sol-gel method, respectively. The structure and morphology characteristics of the products were investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) nitrogen adsorption-desorption measurements. Gas sensors were fabricated as side-heated structure. The ethanol sensing properties of the GaN-NFs and GaN-NPs were compared at operating temperatures from 280 to 360 degrees C and ethanol concentrations ranging from 50 to 1000 ppm. The results indicate that the porous GaN-NFs show improved response to ethanol with good selectivity, which is attributed to the 1D porous nanostructure. The ethanol sensing mechanism of the porous GaN-NFs was also discussed. (C) 2014 Elsevier B.V. All rights reserved.
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