Synthesis and Raman optical properties of single-crystalline Bi nanowires

详细信息    查看全文

• 作者：Wenzhong Wang ; ^{wzhwang@aphy.iphy.ac.cn} ; Meijing Liu ; Zhixiong Yang ; Weijie Mai ; Juntai Gong
• 刊名：Physica E
• 出版年：2012
• 出版时间：April-May, 2012
• 年：2012
• 卷：44
• 期：7-8
• 页码：1142-1145
• 全文大小：705 K

文摘

Bi nanowires with diameters of 20^-200 nm, and length of up to more than 80 ¦Ìm were synthesized by a simple solvothermal method. The as-prepared Bi nanowires were characterized by XRD, TEM, SAED and HRTEM. The laser power dependent Raman optical properties of the Bi nanowires were investigated for the first time. The result indicated that two first-order Raman peaks of the as-prepared nanowires are red-shifted 6 cm^? compared with those of bulk Bi crystals after irradiation by laser with above 50 % laser power. HRTEM investigations indicated that a Bi/oxide core/shell nanostructure was formed when the nanowires were irradiated by laser with above 50 % laser power. A rational explanation for the red-shift of Raman peaks were discussed in detail according to phonon confinement model of an infinite crystal based on HRTEM results.