Bi2Te3 thin hexagonal nanoplatelets: Synthesis and its characterization studies
Journal
Physica E: Low-Dimensional Systems and Nanostructures
Journal Volume
92
Pages
17-22
Date Issued
2017
Author(s)
Abstract
Solvothermal synthesis and optimization of pure Bismuth telluride (Bi2Te3) hexagonal nanoplatelets was carried out from Bismuth Oxide (Bi2O3) and Tellurium dioxide (TeO2). XRD measurements revealed a sensitive change in crystallization behaviour in correlation with variation in Te/Bi stoichiometry identified through the exchange in intensities between (1010̅) and (110) peaks. Further, Energy Dispersive X-ray (EDAX) analysis revealed the variation in Te/Bi ratio with respect to autoclave temperature. Field emission scanning electron Microscope (FESEM) and the high resolution transmission electron Microscope (HRTEM) studies show the complete growth of hexagonal nanoplatelets at 200 °C. Confocal Micro-Raman measurements revealed the occurrence of symmetry breaking in the synthesized hexagonal nanoplatelets. The electrical conductivity and the activation energy were recorded as 6.01×10−3 S/m and 0.042 eV respectively. Highest maximum absolute value of Seebeck coefficient of –355 μV/K was obtained for the hexagonal nanoplatelets.
SDGs
Publisher
Elsevier B.V.
Type
journal article