Facile Synthesis and Thermoelectric Properties of Self-assembled Bi2Te3 One-Dimensional Nanorod Bundles

Self‐assembled Bi2Te3 one‐dimensional nanorod bundles have been fabricated by a low‐cost and facile solvothermal method with ethylene diamine tetraacetic acid as an additive. The phase structures and morphologies of the samples were characterized by X‐ray diffraction, scanning electron microscopy, Fourier‐transform infrared spectrometry, and transmission electron microscope measurements. The growth mechanisms have been proposed based on the experimental results. The full thermoelectric properties of the nanorod bundles have been characterized and show a large improvement in the thermal conductivity attributed to phonon scattering of the nanostructures and then enhance the thermoelectric figure of merit. This work is promising for the realization of new types of highly efficient thermoelectric semiconductors by this method. Nano‐hot‐rods: A simplified chemical process to synthesize pure Bi2Te3 nanorod bundles was developed, and the formation of Bi2Te3 nucleation, the growth of Bi2Te3 nanostructures, and the process of self‐assembly were investigated (see figure). The enhancement of the thermal conductivity has been demonstrated and compared to that of thermoelectric materials.