Journal
RSC ADVANCES
Volume 5, Issue 121, Pages 100309-100315Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra20014h
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Funding
- National Natural Science Foundation of China [51401089]
- Natural Science Foundation of Jiangsu Province [BK20140552, BK20140013]
- Scientific Research Foundation of Jiangsu University [14JDG013, 11JDG098]
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A facile and scalable glucose-assisted hydrothermalmethod has been established for the fabrication of Bi2Te3, Sb2Te3 and Bi2Te3-Sb2Te3 nanowires in high yield. PH additives, such as HCl and NaOH, play crucial roles for the fabrication of Bi2Te3, Sb2Te3 and Bi2Te3-Sb2Te3 nanowires. It is suggested that fine Te nanowires are initially formed and they serve as templates for the fabrication of telluride nanowires. Bi2Te3 nanowires are obtained by direct one-step hydrothermal synthesis under acidic conditions when HCl is used as the pH additive. The as-prepared Bi2Te3 nanowires have different wire axes that can be parallel or perpendicular to the [001] direction. Two different mechanisms, i.e., structural preference growth mechanism and coherent growth mechanism are suggested for the formation of Bi2Te3 nanowires. A single phase of Sb2Te3 cannot be obtained under acidic conditions due to the slow kinetics of the reduction reaction even at elevated reaction temperatures. A two-step synthesis is proposed for the fabrication of Sb2Te3 and Bi2Te3-Sb2Te3 nanowires, where Te nanowires are first formed with a HCl additive and Sb2Te3 and Bi2Te3-Sb2Te3 nanowires are then fabricated with a NaOH additive. Besides the enhanced phonon scattering and quantum confinement effect, the structure and composition fluctuation in the Bi2Te3-Sb2Te3 nanowires may further adjust the energy band structure and improve the thermoelectric properties.
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