Thermoelectric properties of I-doped n-type Bi_2Te_3-based material prepared by hydrothermal and sub

• 作 者: Fang Wu Wei Wang Xing Hu Mingsheng Tang
• 机 构: College of Physical Engineering and Laboratory of Material Physics,Zhengzhou University,College of P
• 出 处: Progress in Natural Science:Materials International
• 发表日期: 2017年02期
• 关键词: hydrothermal flower subsequent surfactant doping adjustment Seebeck resistivity

I-doped Bi_2Te_(3-x)I_x(x=0, 0.05, 0.1, 0.2) flower-like nanoparticles were synthesized by a hydrothermal method through a careful adjustment of the amount of ethylenediamine tetraacetic acid surfactant. The nanopowders of flower-like nanoparticles were hot-pressed into bulk pellets and the thermoelectric properties of the pellets were investigated. The results showed that I-doping decreased the electrical resistivity effectively, and the thermal conductivitives of the Bi_2Te_(3-x)I_x bulk samples was lower because of the closer atomic mass of I compared to Te.As a result, a ZT value of 1.1 was attained at 448 K for the Bi_2Te_(2.9)I_(0.1)sample.

I-doped Bi_2Te_ (3-x) I_x (x = 0, 0.05, 0.1, 0.2) flower-like nanoparticles were synthesized by a hydrothermal method through a careful adjustment of the amount of ethylenediamine tetraacetic acid surfactant. The nanopowders of flower- The results showed that I-doping decreased the electrical resistivity effectively, and the thermal conductivities of the Bi_2Te_ (3-x) I_x bulk samples was lower because of the closer atomic mass of I compared to Te. As a result, a ZT value of 1.1 was attained at 448 K for the Bi_2Te_ (2.9) I_ (0.1) sample.