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.
Highlights
Hydrogen burns cleanly without releasing pollutants or greenhouse gases and in recent years, more attention has been paid to hydrogen as an excellent candidate for fossil fuel replacement in Polymers 2013, 5 household and transportation applications
It has been shown that the addition of an appropriate amount of noble metal additives promotes chemical reactions by reducing activation energy between the surface of metal oxide and target gas
Scanning electron microscope (SEM) images of as-spun Polyvinyl pyrrolidone (PVP) composite fibers and the sintered fibers at 500 °C for 1 h are displayed in Figure 1a,b, respectively
Summary
Hydrogen burns cleanly without releasing pollutants or greenhouse gases and in recent years, more attention has been paid to hydrogen as an excellent candidate for fossil fuel replacement in Polymers 2013, 5 household and transportation applications. It has been shown that the addition of an appropriate amount of noble metal additives promotes chemical reactions by reducing activation energy between the surface of metal oxide and target gas. This increases the response and selectivity as well as decreasing the maximum working temperature of the sensors. Metal oxide fibers could be synthesized by combining sol-gel and electrospinning methods. In our previous work [29], the sensitivity of both pure and Pd-modified WO3 thin films was measured towards hydrogen as a function of operating temperatures in the range of 30 °C to 350 °C. The Pd doped WO3 nanofibers showed fast response time and high sensitivity toward hydrogen gas at low temperature
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