| 초록 |
Thermoelectric materials are of interest for applications as power generators. The great amount of researches has been done to synthesize nanowires, superlattice alloys, or complex bulk materials. In particularly, one-dimensional nanoscale building blocks attract interests for their potential applications in devices. Bismuth telluride (BiTe) has attracted significant attention because of the most TE efficiency at room temperature. BiTe nanowire arrays can be easily prepared within the pores of nanoporous anodic aluminum oxide (AAO) templates, which is stable and the pore channels are uniform and perpendicular to the membrane surface. There are many synthesis methods such as solvothermal process, chemical-vapor deposition, electroless deposition and electrodeposition. Among these various techniques, electrochemical deposition has drawn much attention because of the low operating cost, room-temperature process and the ability to tailor the composition of deposits. Also, uniform growth fronts of deposits leading to maximum device performance can be obtained by adjusting deposition conditions. In this study, to search the optimum synthesis conditions for BiTe nanowire arrays, composition and morphology dependence of deposits as a function of the applied potential and electrolyte concentration were investigated via potentiostatic electrodeposition. Cyclic voltammetry (CV) were conducted to search the optimum deposition potential for the stoichiometric Bi2Te3 compound. The synthesized nanostructures were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and electrical properties analysis. Finally, we optimized the conditions for the uniform and stoichiometric nanowire arrays that expected to be the potential TE devices. |
