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Gas‐Sensing Properties of Needle‐Shaped Ni‐Doped SnO 2 Nanocrystals Prepared by a Simple Sol–Gel Chemical Precipitation Method
Author(s) -
Yogamalar Rajeswari,
Mahendran Vellusamy,
Srinivasan Ramasamy,
Beitollahi Ali,
Kumar R. Pradeep,
Bose Arumugam Chandra,
Vinu Ajayan
Publication year - 2010
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201000358
Subject(s) - materials science , crystallite , tetragonal crystal system , rutile , nickel , nanocrystal , dopant , doping , precipitation , chemical engineering , scanning electron microscope , phase (matter) , analytical chemistry (journal) , nanotechnology , metallurgy , chemistry , chromatography , composite material , organic chemistry , optoelectronics , physics , meteorology , engineering
The preparation of needle‐shaped SnO 2 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 SnO 2 nanocrystals are significantly changed. Powder XRD results reveal that the SnO 2 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 SnO 2 , to very fine needle‐like nanocrystals, for Ni‐doped SnO 2 , annealed at different temperatures. The gas sensing properties of the SnO 2 nanocrystals are significantly enhanced after the nickel doping.
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