Ming Yau Chern
National Taiwan University, Taiwan
Title: Synthesis and characterization of single-crystal bismuth telluride nanowires
Biography
Biography: Ming Yau Chern
Abstract
Topological insulators have high values in both theoretical and application aspects. In this work, we synthesize and study the nanowires of topological insulator bismuth telluride (Bi2Te3). The nanowires are grown on glass substrates by thermal evaporation of bulk Bi2Te3 at elevated temperature in an argon flow two-zone furnace, where the substrate temperature can be adjusted independently. The growth temperature has a strong influence on the growth direction of the nanowires. Currently, the known growth direction of the Bi2Te3 nanowires is rhombohedral indexing, less is known about other growth directions. We are able to grow nanowires of Bi2Te3 in different directions by tuning the substrate temperature. Other growth factors such as the flow rate of the argon gas, the background pressure, and the vapor pressure of Bi2Te3 are discussed. We examine the nanowires with XRD, SEM and TEM. We also measure the transport properties of single nanowires. The properties and anisotropy of these nanowires are discussed.
Recent Publications
- Chern MY, Lu TW, Xu WL (2015) (110)-Oriented Indium Tin Oxide Films Grown on M- and R-plane Sapphire Substrates. Japanese Journal of Applied Physics 54:045503.
- Wu BK, Chern MY, Lee HY. (2014) Size-controllable synthesis and bandgap modulation of single-layered RF-sputtered bismuth nanoparticles. Nanosale Research Letters 9:249-256.
- Lee HY, Wu BK, Chern MY. (2013) Schottky Photodiode Fabricated from Hydrogen-Peroxide-Treated ZnO Nanowires. Applied Physics Express 6:054103.
- Lee HY, Wu BK, Chern MY. (2013) Temperature dependence and the effect of hydrogen peroxide on ITO/poly-ZnO Schottky diodes fabricated by laser evaporation. Current Applied Physics 13:1325- 1330.
- Wu BK, Lee HY, Chern MY. (2013) Bismuth Nanowire Grown Naturally Using a Sputtering System. Applied Physics Express 6: 035504.