| In recent years, environmental problems, especially air pollution issues have attracted more and more attentions. Detecting and monitoring of polluting gases, toxic gases and explosive gases have become a necessary part of industrial production and daily life. Sn O2 is a kind of n-type semiconductors with a wide band gap. It has excellent gas sensing properties for applications in detecting explosive gases, industrial gases and noxious gases. However, the sensitivity and selectivity properties of Sn O2 still need to improve. Nanocrystallization, metal-doping and surface-decoration can efficiently help improving the sensing property of Sn O2.In this work, hollow Sn O2 nanofibers were prepared via electrospinning and thermal treatment followed by decoration of Au nanoparticles. Transmission electron microscopy(TEM), scanning electron microscopy(SEM), X-ray diffraction(XRD) were used to characterize the hollow Sn O2 nanofibers. The gas sensing properties of the products were also investigated. The main results are as follows:1. Polyvinylpyrrolidone(PVP)/Sn Cl2 composite nanofibers were prepared via electrospinning. After thermal treatment, PVP were decomposed and Sn Cl2 were oxidized to Sn O2.Then, hollow Sn O2 nanofibers were produced which exhibits rough surface and large surface-to volume ratio.2. The structure of produced hollow Sn O2 nanofibers is rutile with the lattice parameters of a=b=0.4737 nm and c=0.3186 nm. A bit of gold were deposited on the Sn O2 via surface-decoration technology and the structure of the product was not changed.3. The gas sensing properties of pure hollow Sn O2 nanofibers and gold decorated hollow Sn O2 nanofibers were investigated. Gold decorated hollow Sn O2 nanofibers showed higher sensitivities and wider detection range to hydrogen, nitrogen dioxide and ethyl alcohol. The results shows that the surface-decoration with a bit of gold could significantly improve the gas sensing properties of Sn O2 nanofibers. |
PDF Full Text Request