Development of Double-Laser Co-Deposition System for the Preparation of Bi2te3/Cnt Thermoelectric Heterocomposites
|Keywords:||熱電功率;複合材料;碲化鉍;奈米碳管;thermoelectric power factor;composite;Bi2Te3;CNT|
Thermoelectric materials have recently reattracted much attention due to the rapid growth of various clean-energy industries and the great development of nanotechnologies, a series of novel thermoelectric materials with comparable high figure of merit (ZT) have been widely discovered. Acadamic and industrial research effort thus tends to refocus on development of novel thermoelectric materials. According to numbers of outstanding theoretical and experimental studies, it is found that the thermoelectric heterocomposites seems can be considered as an effective strategy to greatly enhance the ZT value for most thermoelectric materials. The thermoelectric performance will thus completely depend on the materails, design of the composite structure as well as the preparation method. Based on our present techniques and experiences, this project attempts to develop a novel double-laser co-deposition system for the preparation of thermoelectric heterocomposites with high ZT values. Due to the high-vacuum physical deposition, different thermoelectric materials can be co-deposited without exposing to atmosphere to avoid oxidation and contamination. In addition, the absence of surfactant and catalysts as frequently used in the chemical process can also decrease the resistance distributed from grain boundaries and interfaces and thus can enhance the overall thermoelectric properties. Additionally, the double-laser can be individually optimized to fit the deposition requirement of different thermoelectric materials and to control the structural parameters. This advantage is the main point of the present project. In this project, we aim at two thermoelectric materials for the heterocomposites, i.e. Bi2Te3 and carbon nanotube (CNT). Recently, many studies have demonstrated great potentials of various types of CNTs for thermoelectric applications. The deposition and control techniques of CNTs have been well known and it is easy to prepare highly oriented CNT arrays. Here we will use these preparation advantages to co-deposit various Bi2Te3/CNT composite structures for optimizing composite structures.
|Gov't Doc #:||NSC100-2622-E009-009-CC2|
|Appears in Collections:||Research Plans|