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Journal of Nanotechnology
Volume 2011, Article ID 569036, 6 pages
Research Article

Synthesis and Humidity Sensing Properties of Sn-Doped Nano-

1Department of Physics, Mepco Schlenk Engineering College, Sivakasi 626 005, Tamilnadu, India
2Department of NanoScience and Technology, Mepco Schlenk Engineering College, Sivakasi 626 005, Tamilnadu, India
3Department of Physics, Kamaraj College of Engineering and Technology, Virudhunagar 626 001, Tamilnadu, India

Received 9 March 2011; Accepted 21 June 2011

Academic Editor: John A. Capobianco

Copyright © 2011 P. Raji et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nanostructured Sn-doped TiO2 have been prepared by ball milling using SnO2 and TiO2 as raw materials. The as-prepared powders are characterized by XRD, SEMs and EDAX to identify the structural phases, surface morphology, and composition of the materials. The materials are prepared with the addition of tin of different molar ratios (0, 0.05, 0.10, 0.15, 0.20, 0.25, and 1.0) to TiO2 and sintered at 800°C for 3 h. They are subjected to dc resistance measurements as a function of relative humidity (RH) in the range of 30%–97% in a self-designed humidity chamber, and the results revealed that the sensitivity factor increased with an increase in tin molar ratio. Among them, TiO2—20 wt% of SnO2 possessed the highest humidity sensitivity, while the pure TiO2 and SnO2 composite possessed a low sensitivity.