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Vol. 73, Issue 11, November 2006, pp. 819-825




Effective Factors on Methane Sensing of Tin-Oxide Activated by Palladium in Sol-Gel Process


Davood Abbaszadeha, Roghayeh Ghasempoura, Fereshteh Rahimia, Azam Iraji zada,b

aDepartment of Physics, Sharif University of Technology, Tehran, P.O.Box 11365-9161, Iran

bInstitute for Nanoscience and Technology (INST), Sharif University of Technology, Tehran, P.O.Box 11365-9161, Iran

Tel.: ++98-21-66164513, fax: ++98-21-6602 2711

E-mail: Iraji@sharif.edu


Received: 8 October 2006   /Accepted: 30 November 2006   /Published: 4 December 2006



Abstract: Stannic oxide thin films activated by palladium were prepared by sol-gel method. The morphology of the layers and the size of the particles were investigated by scanning electron microscopy and atomic force microscopy. Investigations showed that the number of coating, annealing procedure and the viscosity of the sol, affect structure and thickness of the layers. These different preparing conditions result in different change in resistivity of the samples toward methane gas. In addition to these parameters, the Pd/Sn atomic ratio in the sol is another effective factor on sensitivity of methane.


Keywords: Methane sensor, SnO2 nanoparticle, Palladium, Sol-gel


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