Gas-sensing properties of needle-shaped Ni-doped SnO2 nanocrystals prepared by a simple sol-gel chemical precipitation method
Date
2010
Authors
Yogamalar, R.
Mahendran, V.
Srinivasan, R.
Beitollahi, A.
Kumar, R.P.
Bose, A.
Vinu, A.
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Journal article
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Chemistry - An Asian Journal, 2010; 5(11):2379-2385
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Abstract
The preparation of needle-shaped SnO2 nanocrystals doped with different concentration of nickel by a simple sol-gel chemical precipitation method is demonstrated. By varying the Ni-dopant concentration from 0 to 5 wt%, the phase purity and morphology of the SnO2 nanocrystals are significantly changed. Powder XRD results reveal that the SnO2 doped with a nickel concentration of up to 1 wt% shows a single crystalline tetragonal rutile phase, whereas a slight change in the crystallite structure is observed for samples with nickel above 1 wt%. High resolution scanning electron microscopy (HRSEM) results reveal the change in morphology of the materials from spherical, for SnO2, to very fine needle-like nanocrystals, for Ni-doped SnO2, annealed at different temperatures. The gas sensing properties of the SnO2 nanocrystals are significantly enhanced after the nickel doping.
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Data source: Supporting information, http://onlinelibrary.wiley.com/store/10.1002/asia.201000358/asset/supinfo/asia_201000358_sm_miscellaneous_information.pdf?v=1&s=1d93943f2feb1b4930731bbc1d30808afac584cf
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