Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Solvothermal synthesis and thermoelectric properties of indium telluride nanostring-cluster hierarchical structures | Tai et al. Nanoscale Research Letters 2011 6 329 http content 6 1 329 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Solvothermal synthesis and thermoelectric properties of indium telluride nanostring-cluster hierarchical structures z -I--1 1 1 w r 1 2 1 Guo an Tai Chunyang Miao Yubo Wang Yunrui Bai Haiqian Zhang and Wanlin Guo Abstract A simple solvothermal approach has been developed to successfully synthesize n-type a-In2Te3 thermoelectric nanomaterials. The nanostring-cluster hierarchical structures were prepared using In NO3 3 and Na2TeO3 as the reactants in a mixed solvent of ethylenediamine and ethylene glycol at 200 C for 24 h. A diffusion-limited reaction mechanism was proposed to explain the formation of the hierarchical structures. The Seebeck coefficient of the bulk pellet pressed by the obtained samples exhibits 43 enhancement over that of the corresponding thin film at room temperature. The electrical conductivity of the bulk pellet is one to four orders of magnitude higher than that of the corresponding thin film or p-type bulk sample. The synthetic route can be applied to obtain other low-dimensional semiconducting telluride nanostructures. PACS Introduction Thermoelectric materials that convert electrical energy into thermal energy or vice verse have been used in cooling heating generating power and recovering waste heat 1-4 . The thermoelectric performance of a given material is characterized by its dimensionless figure of merit 5 ơ S2 T k where s S k and T are the electrical conductivity Seebeck coefficient thermal conductivity and absolute temperature respectively. The thermal conductivity comprises the combination of heat carried by phonons or lattice vibrations kl and electrical carriers ke . A good thermoelectric material should be p erfective combination of high power factor S2s with low thermal conductivity. In a bulk material the Weidmann-Franz law limits the
