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Preparation of gas sensing CoTiO3 nanocrystallites using EDTA as the chelating agent in a sol–gel process.
- Source :
-
Ceramics International . Apr2015, Vol. 41 Issue 3, Part A, p3714-3721. 8p. - Publication Year :
- 2015
-
Abstract
- CoTiO 3 nanocrystallites with an average diameter of 40 nm were prepared by the sol–gel method using C 10 H 16 N 2 O 8 (EDTA) as the chelating agent. The thermal decomposition process and chemical bonding of the precursor were studied by thermogravimetric-differential scanning calorimetry and fourier transform infrared spectra, respectively. The as-prepared nanocrystallites were characterized by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy. The effects of calcination temperature, sol pH and chelating agent on the formation of CoTiO 3 were investigated. The results show that calcination temperature is a key factor controlling the composition of the products. Acid sol is the optimum condition for hydrolysis and polycondensation of Ti(OC 4 H 9 ) 4 . Co 2+ and Ti 4+ were bonded together by EDTA, and pure CoTiO 3 nanocrystallites were obtained due to this chelating effect. The chelating mechanism and the formation process of CoTiO 3 in the sol–gel process were proposed. Furthermore, the nano-CoTiO 3 was applied to make a gas sensor, and the response value to 104 ppm ethanol was 17.9, response time and the recovery time were 13 s and 10 s, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 41
- Issue :
- 3, Part A
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 108298154
- Full Text :
- https://doi.org/10.1016/j.ceramint.2014.11.044