Study of the Structural, Morphological and Electrical Properties of WO₃ Nanopowders which Use as Gas Sensors

Abstract

Nano-powders of tungsten oxide (WO 3 ) have been prepared by high energy ballmilling for various spans of mill time (1-18 h). The crystal structure, surface morphology of the prepared WO 3 nano powder were characterized by X-ray diffraction and scanning electron microscope. Thick films of WO 3 Nano-powders were prepared by printing painting chemical method to use them as gas sensors for methanol vapor at different operating temperatures, Their I-V characteristics were studied by using devices KEITHLEY 237. The effect of the milling time on the crystal structure, surface morphology, and electrical properties are reported.