Degree Type

Thesis

Date of Award

2011

Degree Name

Master of Science

Department

Materials Science and Engineering

First Advisor

Zhiqun Lin

Abstract

Thermoelectric materials, in which a temperature difference creates an electric potential or an electric potential creates a temperature difference, are probably a key to solving global warming and energy shortage problems. There are three thermoelectric effects: the Seebeck effect (temperature to current), Peltier effect (current to temperature), and Thomson effect (conductor heating/cooling). However the efficiency of thermoelectric materials has been rather low for practical applications, including power generation and refrigeration as it requires an optimization of the combination of conflicting material characteristics (i.e., thermal conductivity and electrical conductivity). To date, efforts have been made to capitalize on nanotechnology to create novel semiconducting materials that could finally make thermoelectricity a widely used technology. In my research, I systematically synthesized bismuth (Bi) nanocrystals as one of very important thermoelectric materials by hydrothermal and star-like amphiphilic block copolymer nanoreactor approaches. The size of Bi nanoparticles prepared by employing star-like amphiphilic block copolymer templates was better controlled. The thermoelectric properties of Bi nanocrystals were improved when their crystalline sizes are smaller than 10nm.

DOI

https://doi.org/10.31274/etd-180810-2148

Copyright Owner

Weijie Yu

Language

en

Date Available

2012-04-28

File Format

application/pdf

File Size

70 pages

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