| Summary: | 碩士 === 國立東華大學 === 材料科學與工程學系 === 102 === The Bi2S3/α-Bi2O3 heterostructured nanowires were synthesized by using vapor transport process and followed by a hydrothermal process on Al2O3(0001).The effect of growth time on surface morphology, chemical compositions and optical property of samples have been examined. FE-SEM images show that the diameter of heterostructured nanowires increases with growth time. XRD results show that the heterostructured nanowires consists of α-Bi2O3, Bi2S3 and Bi. XPS results confirm the surface composition of sample are: α-Bi2O3, Bi2S3 and Bi. TEM images show that the thickness of Bi2S3 shell layer increases with growth time, and branch-like hierarchical heterostructures were observed when reaction time is longer than 4h. PL spectra show three main emissions centered at 601 nm, 540 nm, and 416 nm, respectively. The luminescence efficiency was enhanced when shell layer was approximately 10 nm. The UV/vis spectra show the heterostructured nanowires are with strong absorption in visible light due to of Bi2S3 layer. The photoelectrochemical experiment reveals the heterostructured nanowires are with higher photocurrent density than α-Bi2O3 nanowires.
|
|---|
