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Home  >  Journal list  >  Polymer Journal  >  Vol.41  No.9 (2009)  >  pp.726-732

Polymer Journal
<<Previous article Vol.41  No.9 (2009)   pp.726 - 732 Next article>>

Vacuum-Deposited Poly(o-phenylenediamine)/WO3·nH2O Nanocomposite Thin Film for NO2 Gas Sensor

Ashutosh Tiwari1) and Songjun Li2)
1) Division of Engineering Materials, National Physical Laboratory
2) Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University


ABSTRACT:  The vacuum-deposited thin film of hydrated tungsten oxide (WO3·nH2O) embedded poly(o-phenylenediamine) (PoPD/WO3·nH2O) nanocomposite was fabricated on an indium tin oxide (ITO) coated glass surface for potential NO2 gas sensor application. The resulting PoPD/WO3·nH2O/ITO thin film was characterized using ultraviolet-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and electron microscopy (SEM). The composite thin film exhibited a crystalline surface morphology containing nanocrystalls of WO3·nH2O with a diameter ranging from 5 to 10 nm. The PoPD/WO3·nH2O/ITO film allowed for the low potential detection of NO2 gas at concentration range from 0 to 1800 ppm. The NO2 gas sensing characteristics were studied by measuring change in the current with respect to concentration and time. The current of the PoPD/WO3·nH2O/ITO film was linearly increased with an increase in concentration of NO2 gas with a response of ∼9 s.


Keyword:
Poly(o-phenylenediamine)/ Hydrated Tungsten Oxide/ Vacuum-Deposition/ Thin Film/ Nanocomposite/ NO2 Gas Sensor

Published online: September 15, 2009
© Copyright, 2009 by The Society of Polymer Science, Japan

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