Gas-Sensing Properties of Needle-Shaped Ni-Doped SnO2 Nanocrystals Prepared by a Simple Sol-Gel Chemical Precipitation Method

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 chang...

Full description

Saved in:
Bibliographic Details
Published in:Chemistry, an Asian journal an Asian journal, 2010-11, Vol.5 (11), p.2379-2385
Main Authors: Yogamalar, Rajeswari, Mahendran, Vellusamy, Srinivasan, Ramasamy, Beitollahi, Ali, Kumar, R. Pradeep, Bose, Arumugam Chandra, Vinu, Ajayan
Format: Article
Language:English
Subjects:
doping
nanoparticles
nickel
sensors
sol-gel processes
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. Nanoneedle sensor: We report on the preparation and characterization of SnO2 nanoparticles with different concentrations of nickel dopants by a simple sol–gel chemical precipitation method and their ethanol gas‐sensing capability. A significant enhancement in the ethanol‐gas sensitivity has been observed for the Ni‐doped SnO2 materials.
ISSN:1861-4728
1861-471X
DOI:10.1002/asia.201000358