A Facile Surfactant-assisted Reflux Method for the Synthesis of Single-Crystalline Sb2Te3 Nanostruct

• 作 者: LeiMiao[1]HengQuanYang[2]ChengYanLiu[1]ChaoLi[3]RongHuang[3]
• 机 构: Guangxi Key Laboratory of Information Material,Guangxi Collaborative Innovation Center of Structure
• 出 处: 第六届海内外中华青年材料科学技术研讨会暨第十五届全国青年材料科学技术研讨会
• 发表日期: 2015年期

　　Antimony telluride(Sb2Te3)and its based alloys are of importance p-type semiconductors for the thermoelectric applications near room temperature.Herein,we report a simple,low-energy intensive and scalable surfactant-assisted reflux method for the synthesis of Sb2Te3 nanoparticles in the solvent of ethylene glycol(EG)at low temperatures(120~180 ℃).The formation mechanism of plate-like Sb2Te3 nanoparticles is proposed.And it is found that the size,shape and chemical composition of the products could be controlled by the introduction of the organic surfactants(CTAB,PVP and etc.)or inorganic salts(EDTA-Na2,NaOH and etc.).Additionally,the collected Sb2Te3 nanoparticles were further fabricated into nanostructured pellets using cold-compaction and annealing techniques.The low resistivity(7.37~19.4 × 10-6 Ω m),moderate Seebeck coefficient(103~141 μtV/K)and high power factor(10~16 × 10-4 W m-1 K-2)have been achieved in our Sb2Te3 nanostructured bulks.The relatively low thermal conductivity(1.32~1.55 W m-1 K-1)is attained in the nanobulk made of PVP-modified nanoparticles and the values of ZT in the range of 0.24~0.37 are realized at the temperatures ranging from 50 ℃ to 200 ℃.Our researches set forth a new avenue in promoting practical applications of Sb2Te3-based thermoelectric power generation or cooling devices.