Vol. 107, Issue 8, August 2009, pp. 99-110

Sol Gel Synthesis of Tungsten Oxide Thin Film in Presence of Surfactant for NO₂ Detection

Vibha Srivastava, A. K. Srivastava, K. N. Sood, ^*Kiran Jain

Electronic Materials Division, National Physical Laboratory

Dr. K. S. Krishnan Marg, New Delhi, India

Tel.: 91-45608279, fax: 0091-11-25726938

E-mail: kiran@mail.nplindia.ernet.in

Received: 20 April 2009   /Accepted: 15 August 2009   /Published: 25 August 2009

Abstract: The sol–gel method was used to prepare WO₃ powder as well as film. The addition of block copolymer F 127 surfactant during synthesis resulted in a highly porous structure with reduced grain size. WO₃ thin films prepared without surfactant addition showed a lamellar structure on annealing at 350º C, while the surfactant - added samples showed spherical nodules. NO₂ gas response was enhanced for thin films prepared in presence of surfactant as compared to the films without surfactant. The film annealed at 600° C showed higher response magnitude as compared to 350º C annealed film. The gas response for a thick film was quite low as compared to thin film sensor derived through similar route.

Keywords: Oxides, Chemical synthesis, X-ray diffraction, Electrical properties

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