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Structure, Optical and Formaldehyde Sensing Properties of Co-Precipitated Fe-Doped WO₃ Nanomaterials

S. B. Upadhyay

Department of Physics, Motilal Nehru National Institute of Technology, Allahabad-211004, India

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and

P. P. Sahay

Department of Physics, Motilal Nehru National Institute of Technology, Allahabad-211004, India

E-mail Address: dr_ppsahay@rediffmail.com

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https://doi.org/10.1142/S1793292015501131Cited by:13 (Source: Crossref)

Abstract

Co-precipitated undoped and Fe-doped WO₃ nanomaterials have been investigated by X-ray diffraction, Raman spectroscopy and scanning electron microscopy in order to study the influence of Fe doping in their structural and morphological properties. The synthesized WO₃ nanomaterials have been found to possess monoclinic structure having average crystallite sizes 15–20nm. The diffuse reflectance spectroscopy shows the optical bandgap $\sim$ 2.85eV. The 1.8 at.% Fe-doped WO₃ exhibits selective high response to formaldehyde over methanol, ethanol, propan-2-ol and acetone. It exhibits the maximum response ( $\sim$ 80%) to formaldehyde at the operating temperature of 225 $^{\circ}$ C for 50ppm concentration in air.

Keywords:

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