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Fabrication of Pd Doped WO3 Nanofiber as Hydrogen Sensor

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Author(s): Alireza Nikfarjam | Somayeh Fardindoost | Azam Iraji zad

Journal: Polymers
ISSN 2073-4360

Volume: 5;
Issue: 1;
Start page: 45;
Date: 2013;
Original page

Keywords: Pd doped WO3 nanofiber | hydrogen sensor | electrospinning | sensing mechanism

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.
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