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Fabrication of Pd Doped WO3 Nanofiber as Hydrogen Sensor
Faculty of New Sciences & Technologies, University of Tehran, P.O. Box 14395-1374, Tehran, Iran
Department of Physics, Sharif University of Technology, Azadi Street, P.O. Box 11365-9161, Tehran, Iran
Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Azadi Street, P.O. Box 11155-8639, Tehran, Iran
* Author to whom correspondence should be addressed.
Received: 18 November 2012; in revised form: 10 December 2012 / Accepted: 25 December 2012 / Published: 10 January 2013
Abstract: Pd doped WO3 fibers were synthesized by electro-spinning. The sol gel method was employed to prepare peroxopolytungstic acid (P-PTA). Palladium chloride and Polyvinyl pyrrolidone (PVP) was dissolved in the sol Pd:WO3 = 10% molar ratio. The prepared sol was loaded into a syringe connected to a high voltage of 18.3 kV and electrospun fibers were collected on the alumina substrates. Scanning electron microscope (SEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques were used to analyze the crystal structure and chemical composition of the fibers after heat treatment at 500 °C. Resistance-sensing measurements exhibited a sensitivity of about 30 at 500 ppm hydrogen in air, and the response and recovery times were about 20 and 30 s, respectively, at 300 °C. Hydrogen gas sensing mechanism of the sensor was also studied.
Keywords: Pd doped WO3 nanofiber; hydrogen sensor; electrospinning; sensing mechanism
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MDPI and ACS Style
Nikfarjam, A.; Fardindoost, S.; Iraji zad, A. Fabrication of Pd Doped WO3 Nanofiber as Hydrogen Sensor. Polymers 2013, 5, 45-55.
Nikfarjam A, Fardindoost S, Iraji zad A. Fabrication of Pd Doped WO3 Nanofiber as Hydrogen Sensor. Polymers. 2013; 5(1):45-55.
Nikfarjam, Alireza; Fardindoost, Somayeh; Iraji zad, Azam. 2013. "Fabrication of Pd Doped WO3 Nanofiber as Hydrogen Sensor." Polymers 5, no. 1: 45-55.