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Electrodeposition of nanoengineered ...

Xiao, Feng.

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Electrodeposition of nanoengineered thermoelectric materials.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Electrodeposition of nanoengineered thermoelectric materials./
作者:	Xiao, Feng.
面頁冊數:	159 p.
附註:	Adviser: Nosang V. Myung.
Contained By:	Dissertation Abstracts International69-01B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3298268
ISBN:	9780549416623

Electrodeposition of nanoengineered thermoelectric materials.
Xiao, Feng.

Electrodeposition of nanoengineered thermoelectric materials. - 159 p.

Adviser: Nosang V. Myung.

Thesis (Ph.D.)--University of California, Riverside, 2007.

Thermoelectric (TE) energy converters are solid-state devices that can generate electricity by harvesting waste thermal energy, thereby improving the efficiency of a system. The many advantages of TE devices include solid-state operation, zero-emissions, vast scalability, no maintenance and a long operating lifetime. The efficiency of TE materials is directly related to a dimensionless figure of merit ZT. In order to compete with conventional refrigerators and power generators, ZT of 3 is required. Due to their limited energy conversion efficiencies (i.e. ZT < 1), thermoelectric devices currently have a rather limited set of applications.

ISBN: 9780549416623Subjects--Topical Terms:

1018531
Engineering, Chemical.

Electrodeposition of nanoengineered thermoelectric materials.
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100 1 $a Xiao, Feng. $3 1266130
245 1 0 $a Electrodeposition of nanoengineered thermoelectric materials.
300 $a 159 p.
500 $a Adviser: Nosang V. Myung.
500 $a Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0503.
502 $a Thesis (Ph.D.)--University of California, Riverside, 2007.
520 $a Thermoelectric (TE) energy converters are solid-state devices that can generate electricity by harvesting waste thermal energy, thereby improving the efficiency of a system. The many advantages of TE devices include solid-state operation, zero-emissions, vast scalability, no maintenance and a long operating lifetime. The efficiency of TE materials is directly related to a dimensionless figure of merit ZT. In order to compete with conventional refrigerators and power generators, ZT of 3 is required. Due to their limited energy conversion efficiencies (i.e. ZT < 1), thermoelectric devices currently have a rather limited set of applications.
520 $a Classical and quantum mechanical size effects provide additional ways to enhance energy conversion efficiencies in nanostructured materials. Theoretical calculations predict that ZT of 5 can be achieved in one-dimensional nanostructures including nanowires and nanotubes.
520 $a The goal of my work was to develop electrodeposition techniques to synthesis various thermoelectric nanostructures including 2-D superlatticed thin films, 1-D nanowires and nanotubes and quasi 0-D superlatticed nanowires and investigate their properties. Electrodeposition is selected because of the ability to "tailor-made" their morphology and properties. Specifically, the accomplishments of this thesis include the following: (1) Electrodeposition of PbTe thin films was systematically investigated in an acidic nitric bath. (2) Single crystalline PbTe cubes were electrodeposited on polycrystalline gold substrates. (3) Single crystalline PbTe nanowires were synthesized using a template-directed electrodeposition process. The temperature dependent electro-transport studies reveal that the conduction mechanism in the temperature range 150-220 K is different from that in the temperature range 220-300 K. (4) Bi1.8 Sb0.1Te3.1 and (Bi0.3Sb0.7) 2Te3 nanowires were electrodeposited from acidic tartaric-nitric baths and their temperature dependent electrical properties were measured. (5) Quasi 0-dimensional superlattice Bi2Te3/(Bi 0.3Sb0.7)2Te3 nanowires were synthesized from single bath by modulating deposition potentials. The composition and length of each segment were precisely controlled by adjusting deposition potentials and time. (6) Stoichiometric Bi2Te3 nanotubes were synthesized by galvanic displacement reaction of Ni nanowires. The composition of Bi2Te3 nanotubes was precisely controlled by adjusting the [Bi3+]/[HTeO2+] ratio. By combining the pre-magnetically assembled nickel nanowire and galvanic displacement reaction, individual Bi2Te3 nanotube based devices were fabricated and their temperature dependent electrical properties were measured.
590 $a School code: 0032.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0542
690 $a 0794
710 2 $a University of California, Riverside. $3 791122
773 0 $t Dissertation Abstracts International $g 69-01B.
790 $a 0032
790 1 0 $a Myung, Nosang V., $e advisor
791 $a Ph.D.
792 $a 2007
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