%0 Journal Article
%T Fabrication of Pd Doped WO3 Nanofiber as Hydrogen Sensor
%A Alireza Nikfarjam
%A Somayeh Fardindoost
%A Azam Iraji zad
%J Polymers
%D 2013
%I MDPI AG
%R 10.3390/polym5010045
%X Pd doped WO 3 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:WO 3 = 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 ˇăC. 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 ˇăC. Hydrogen gas sensing mechanism of the sensor was also studied.
%K Pd doped WO3 nanofiber
%K hydrogen sensor
%K electrospinning
%K sensing mechanism
%U http://www.mdpi.com/2073-4360/5/1/45