Impedance Spectroscopic Inspection Toward Sensitivity Enhancement of Ag-Doped WO₃ Nanofiber-Based Carbon Monoxide Gas Sensor

Abstract:

This work reports the impedance analysis and carbon monoxide gas sensing response of tungsten oxide (WO₃) nanofibers with silver (Ag) nanoparticle doping. The Ag-doped WO₃ nanofibers were prepared by an electrospinning technique. The impedance spectroscopic measurements of undoped and Ag-doped WO₃ nanofibers were performed to study the contribution of electrical parameters involved in the electron transport. The impedance modeling obtained from the fitted Nyquist plot shows that the RC components attributed to Ag-WO₃ interface are introduced to the system upon Ag addition. Carbon monoxide (CO) gas detection was carried out by resistance measurement using a DC method. The sensitivity of Ag-doped WO₃ nanofibers is found to be greater than that of the undoped sample. The improved sensitivity is derived from the high interface resistance between Ag and WO₃ grains. The contribution of Ag dopants is conceived to induce electronic structure alteration of the sensor material.

• Periodical: Materials Science Forum (Volume 872)
• Pages: 230-234
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.872.230
• Online since: September 2016
• Authors: Pundaree Boonma, Papot Jaroenapibal, Mati Horprathum, Sathiraporn Pornnimitra, Boonying Charoen, Napat Triroj
• Keywords: Ag Nanoparticle Doping, Carbon Monoxide Gas Sensors, Electrospinning, Impedance Spectroscopy, Tungsten Oxide Nanofibers

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