東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Synthesis and spectroscopy of compos...

Fitzmorris, Robert C.

Linked to FindBook

Google Book

Amazon

博客來

Synthesis and spectroscopy of composite semiconductor nanomaterials.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Synthesis and spectroscopy of composite semiconductor nanomaterials./
Author:	Fitzmorris, Robert C.
Description:	157 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
Contained By:	Dissertation Abstracts International74-11B(E).
Subject:	Chemistry, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3589319
ISBN:	9781303278266

Synthesis and spectroscopy of composite semiconductor nanomaterials.
Fitzmorris, Robert C.

Synthesis and spectroscopy of composite semiconductor nanomaterials. - 157 p.

Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.

Thesis (Ph.D.)--University of California, Santa Cruz, 2013.

Semiconductor nanostructures, also known as quantum dots (QDs), have shown great promise as optical materials in solar cells, light emitting devices, and as fluorescent probes. When combined with other materials, the properties of QDs can be modified to suit a particular application. QD heterostructures were synthesized and investigated using time resolved spectroscopy in order to understand how to control the fate of excitons. A one pot approach to the synthesis of CdSe/ZnSe/ZnS core/shell/shell QDs was developed, and the shell growth was shown to be an effective means of extending the exciton lifetime and increasing fluorescence quantum yield. Both the extended lifetime and increased fluorescence were attributed to passivation of surface states by the double shell. Furthermore, this approach was adapted to alloyed Cd xZn(1-x)Se QDs to produce CdxZn(1-x)Se/ZnSe/ZnS alloyed core/shell/shell QDs with high fluorescence quantum yield. Transient absorption spectroscopy showed that the shell coating slowed exciton recombination on the ps timescale by passivating surface states. Time resolved fluorescence revealed identical ns dynamics before and after shell growth, this was attributed to very fast surface state recombination that can is complete within a nanosecond. In addition, homogenous CdSe/TiO2 composite nanorods and pure CdSe nanorods were grown using physical vapor deposition. SEM images showed that the CdSe and CdSe/TiO2 nanorod arrays are vertically aligned, with very similar morphology. Ultrafast transient absorption spectroscopy showed that the composite nanorods exhibit very fast electron injection from CdSe into TiO2. The fast electron injection is due to the large interfacial area between the two materials in the composite nanorods.

ISBN: 9781303278266Subjects--Topical Terms:

1021807
Chemistry, General.

Synthesis and spectroscopy of composite semiconductor nanomaterials.
LDR:02677nam a2200289 4500 001 1960471
005 20140616133319.5
008 150210s2013 ||||||||||||||||| ||eng d
020 $a 9781303278266
035 $a (MiAaPQ)AAI3589319
035 $a AAI3589319
040 $a MiAaPQ $c MiAaPQ
100 1 $a Fitzmorris, Robert C. $3 2096141
245 1 0 $a Synthesis and spectroscopy of composite semiconductor nanomaterials.
300 $a 157 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
500 $a Adviser: Jin Z. Zhang.
502 $a Thesis (Ph.D.)--University of California, Santa Cruz, 2013.
520 $a Semiconductor nanostructures, also known as quantum dots (QDs), have shown great promise as optical materials in solar cells, light emitting devices, and as fluorescent probes. When combined with other materials, the properties of QDs can be modified to suit a particular application. QD heterostructures were synthesized and investigated using time resolved spectroscopy in order to understand how to control the fate of excitons. A one pot approach to the synthesis of CdSe/ZnSe/ZnS core/shell/shell QDs was developed, and the shell growth was shown to be an effective means of extending the exciton lifetime and increasing fluorescence quantum yield. Both the extended lifetime and increased fluorescence were attributed to passivation of surface states by the double shell. Furthermore, this approach was adapted to alloyed Cd xZn(1-x)Se QDs to produce CdxZn(1-x)Se/ZnSe/ZnS alloyed core/shell/shell QDs with high fluorescence quantum yield. Transient absorption spectroscopy showed that the shell coating slowed exciton recombination on the ps timescale by passivating surface states. Time resolved fluorescence revealed identical ns dynamics before and after shell growth, this was attributed to very fast surface state recombination that can is complete within a nanosecond. In addition, homogenous CdSe/TiO2 composite nanorods and pure CdSe nanorods were grown using physical vapor deposition. SEM images showed that the CdSe and CdSe/TiO2 nanorod arrays are vertically aligned, with very similar morphology. Ultrafast transient absorption spectroscopy showed that the composite nanorods exhibit very fast electron injection from CdSe into TiO2. The fast electron injection is due to the large interfacial area between the two materials in the composite nanorods.
590 $a School code: 0036.
650 4 $a Chemistry, General. $3 1021807
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0485
690 $a 0488
690 $a 0794
710 2 $a University of California, Santa Cruz. $b Chemistry. $3 2094214
773 0 $t Dissertation Abstracts International $g 74-11B(E).
790 $a 0036
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3589319