Preparation of Pd nanoparticle-decorated hollow SnO2 nanofibers and their enhanced formaldehyde sensing properties

Abstract The Pd nanoparticles decorated hollow SnO2 nanofibers (NFs) were synthesized by the electrospinning technique and the wet decorating process. The properties of the sensing material were characterized by X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). Compared with the pure SnO2 NFs gas sensor, the optimum operating temperature of Pd decorated hollow SnO2 NFs gas sensor dropped to 160 °C from 180 °C. The response to 100 ppm formaldehyde (HCHO) was raised to 18.8 from 5.4. Furthermore, the response-recovery characteristics were enhanced a lot. It is believed that its high gas sensing performance is derived from the hollow structure and the catalysis of Pd nanoparticles.

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