论文部分内容阅读
SiO_2 nanowires were prepared on a SiO_2/Si(111) or Si substrate using Au as a catalyst.The products were characterized using scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).SEM shows that large amounts of SiO_2 nanowires with a diameter of 20-150 nm and length of several nanometers were formed on the entire surface of the substrate.XPS analysis indicates that the nanowires have the composition of Si and O in an atomic ratio of about 1:2,and their composition approximates that of SiO_2.The formation of the SiO_2 nanowires was controlled by the vapor-liquid-solid mechanism.It is found that the annealing time affects the morphology of the products.Finally,the effect of the substrates on the growth of SiO_2 nanowires was discussed. The Si source of the SiO_2 nanowires comes from the substrate or Si powder for different substrates.
SiO 2 nanowires were prepared on a SiO 2 / Si (111) or Si substrate using Au as a catalyst. The products were characterized using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). SEM shows that large amounts of SiO 2 nanowires with a diameter of 20-150 nm and length of several nanometers were formed on the entire surface of the substrate. XPS analysis indicates that the nanowires have the composition of Si and O in an atomic ratio of about 1: 2, and their composition approximates that of SiO 2 nanowires was controlled by the vapor-liquid-solid mechanism. It is found that the annealing time affects the morphology of the products. Finally, the effect of the substrates on the growth of SiO 2 nanowires was discussed The Si source of the SiO_2 nanowires comes from the substrate or Si powder for different substrates.