Thermoelectric Properties of Porous Bi0.5Sb1.5Te3.0

ISBN-13: 9783659535178 / Angielski / Miękka / 2014 / 88 str.

Syed Waqar Hasan

Opis

This research presents a novel technique to enhance thermoelectric properties of p-type Bi0.5Sb1.5Te3.0 (BST) polycrystalline materials by producing nano-to-micro sized porous structures in bulk samples. We initially coated BST powder with Tellurium nanowires. Thus, we designed a fast and inexpensive technique to synthesize Tellurium Nanowires with diameters ranging from 10 150 nm. There is a huge possibility to generalize this technique for chalcogenide nanowires growth. Porosity was dispersed in the SPS-ed pellets by vacuum evaporation of the coated Tellurium. The prevailing challenge in Pore generation is to control pore dimensions. In this research micro-to-nano sized pores are reported. Thermoelectric properties were significantly enhanced by porosity. Pore-BST interfaces, proved to be efficient phonon scattering centers, reduce lattice thermal conductivity down to 0.1 0.2 W/m.K. The overall ZT was 18% higher than the reference samples. X-Ray Diffraction, Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive X-Ray Spectroscopy were used to study the structural and morphological features of our samples.

O autorze

SW. Hasan is currently associated with University of Malaya, Malaysia as a Research Assistant. He completed his Master's degree from SungKyunKwan University, South Korea with specialization in Thermoelectric Materials in Feb 2014. His research interests include Nanomaterials, Inorganic Synthesis, XRD characterization and Device Applications.