Galvanically Displaced Ultralong PbxSeyNiz Hollow Nanofibers with High Thermopower

详细信息    查看全文

• 作者：Miluo Zhang ; Jiwon Kim ; Seil Kim ; Hosik Park ; Hyunsung Jung ; N. George Ndifor-Angwafor ; Jaehong Lim ; Yongho Choa ; Nosang V. Myung
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：April 22, 2014
• 年：2014
• 卷：26
• 期：8
• 页码：2557-2566
• 全文大小：572K
• 年卷期：v.26,no.8(April 22, 2014)
• ISSN：1520-5002

文摘

A cost-effective process that combines electrospinning and a galvanic displacement reaction was utilized to synthesize ultralong hollow Pb_xSe_yNi_z nanofibers with controlled dimensions, morphology, composition, and crystal structure. Ni nanofibers were electrospun with an average diameter of 150 nm and were used as the sacrificial material for the galvanic displacement reaction. The composition and morphology of the Pb_xSe_yNi_z nanofibers were controlled during the reaction by tuning the concentration of HSeO₂⁺ in the electrolytes. Hollow Pb_xSe_yNi_z nanofibers with smooth surfaces were obtained from the low-concentration HSeO₂⁺ solution (i.e., 0.01 and 0.05 mM), but the hollow nanofibers synthesized from the high-concentration HSeO₂⁺ solution (i.e., 1 mM) have rough outer surfaces with nanocrystal protrusions. The Pb content of the nanofibers鈥?composition was varied from 3 to 42% by adjusting the HSeO₂⁺ concentration. The thermoelectric properties of the nanofiber mats were characterized, and the highest Seebeck coefficient of approximately 449 渭V/K at 300 K was found for the Pb₃₇Se₅₉Ni₄ nanofiber mat.