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Fabrication of Pd doped WO3 nanofiber as hydrogen sensor

Nikfarjam, A ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.3390/polym5010045
  3. Publisher: 2013
  4. Abstract:
  5. 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
  6. Keywords:
  7. Pd doped WO3 nanofiber ; After-heat treatment ; Chemical compositions ; Hydrogen gas sensing ; Hydrogen sensor ; Palladium chloride ; Peroxopolytungstic acid ; Polyvinyl pyrrolidone ; Sensing mechanism ; Alumina ; Chlorine compounds ; Electrospinning ; Hydrogen ; Nanofibers ; Photoelectrons ; Scanning electron microscopy ; Sols ; X ray photoelectron spectroscopy ; X ray powder diffraction ; Chemical sensors
  8. Source: Polymers ; Volume 5, Issue 1 , 2013 , Pages 45-55 ; 20734360 (ISSN)
  9. URL: http://www.mdpi.com/2073-4360/5/1/45