單一硒化鎘/硫化鋅量子點與二氧化鈦奈米粒子界面之電子轉移行為與連接分子長度的關係

張裕彬

doi:10.6342/NTU.2012.00399

3.239.51.78，Hello！

Close
Search Quick Search Advanced Search Publication Search	Personal Service Member Login Searching History Use Bonus Card SYMSKAN
Browse Browse by University of Graduate Thesis Browse by Pinyin of Graduate Thesis Browse by Conference Proceedings Topic Browse by Conference Proceedings Publisher Browse by Pinyin of Conference Proceedings Browse by eBook Category Browse by eBook Topic Browse by eBook Publisher
Customer Services Authorize Airiti Recommend a Journal

Search Symbol (Half-width)	Description of Search Symbols
Space	"AND" indicates the intertwining of key terms used in a search
Double Quotation Marks ("") ( " " )	Double quotation marks indicate the beginning and end of a phrase, and the search will only include terms that appear in the same order of those within the quotations. Example: "image process" ： " image process "
?	Indicates a variable letter. Entering two ? will indicate two variable letters, and so on. Example: "Appl?", search results will yield apple, apply… e , appl y … ( (often used to English word searches) )
*	Indicates an unlimited number of variable letters to follow, from 1~n. Example: Enter "appl*", search results will yield apple, apples, apply, applied, application…(often used in English word searches) e , appl es , appl y , appl ied , appl ication … ( (often used to English word searches) )
AND、OR、NOT	Boolean logic combinations of key words is a skill used to expand or refine search parameters. (1) AND (1) AND: Refines search parameters (2) OR (2) OR: Expands search parameters (3) NOT: Excludes irrelevant parameters

DOI stands for Digital Object Identifier （ D igital O bject I dentifier ） ,
and is the unique identifier for objects on the internet. It can be used to create persistent link and to cite articles.

Using DOI as a persistent link

To create a persistent link, add「http://dx.doi.org/」「 http://dx.doi.org/ 」 before a DOI.
For instance, if the DOI of an article is 10.5297/ser.1201.002 , you can link persistently to the article by entering the following link in your browser: http://dx.doi.org/ 10.5297/ser.1201.002 。
The DOI link will always direct you to the most updated article page no matter how the publisher changes the document's position, avoiding errors when engaging in important research.

Cite a document with DOI

When citing references, you should also cite the DOI if the article has one. If your citation guideline does not include DOIs, you may cite the DOI link.

DOIs allow accurate citations, improve academic contents connections, and allow users to gain better experience across different platforms. Currently, there are more than 70 million DOIs registered for academic contents. If you want to understand more about DOI, please visit airiti DOI Registration （ doi.airiti.com ）。

Data Source

Basic & Applied Sciences > Chemistry
College of Science > Graduate Institute of Chemistry

Bibliography Management Tool

Related Links

Report an Issue

Purchase Single Articles

Download PDF

單一硒化鎘/硫化鋅量子點與二氧化鈦奈米粒子界面之電子轉移行為與連接分子長度的關係

Interfacial Electron Transfer from Single CdSe/ZnS Quantum Dots to TiO2 Nanoparticles: Linker-Length Dependence at the Single-Molecule Level

張裕彬 , Masters　　Advisor：林金全　　

英文 DOI： 10.6342/NTU.2012.00399

單分子光譜；螢光；單一量子點；二氧化鈦；電子轉移；閃爍行為；螢光生命期； Single Molecule Spectroscopy ； Single Quantum Dot ； Titanium Oxide ； Electron Transfer ； Heterodimers ； Fluorescence Lifetime

Abstract │ Reference (114) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Single molecule fluorescence spectroscopy (SMS) which combined home-made confocal microscopy and time-correlated single photon counting (TCSPC) system was used to record the fluorescence trajectories and to calculate lifetimes of single semiconductor quantum dot (QD) at the single-molecule level. Electron transfer (ET) rate from single QD to TiO2 film via bifunctional linkers were obtained. CdSe/ZnS QDs were tethered to TiO2 film through bifunctional mercaptoalkanoic acid (MAAs), the interparticle distance of which is controlled by the linker length. The fabricated QD-TiO2 heterodimers provide a model system for the single-molecule exploration of photoinduced electron transfer between QDs and charge acceptors, which is essential process in quantum dot-sensitized solar cells (QDSSCs). The trajectories and lifetimes were obtained by SMS with an excitation of 448 nm pulsed laser. The differences of lifetimes provide strong evidence for chain-length-dependent ET efficiency. ET rate constants were determined to be 2.8x107, 1.9x107, and 3.5x106 s-1 for the chain-length of 1.5, 6.2 and 13.8 Ȧ, the quantum yield were also determined to be 67.4, 45.8 and 7.8 %. The results showed that ET rate constants decreased with length of linkers increased. We further calculate electron coupling elements (HDA) between QDs and TiO2 using the semiclassical Marcus expression. The HDA were determined to be 4.07, 3.82 and 1.58 cm-1 of three different chain lengths, and be close to our prediction. 
We further tethered QDs by linkers with aromatic spacer. The results suggest that the presence of π orbitals accelerates ET rates between QDs and TiO2. We attributed the rapid ET rates to enhancement of electronic coupling strength. 
Finally, we examined the size-effect on QD-MAA-TiO2 systems. The results suggest that the size-dependence of ET dynamics is still valid regardless of the existence of linkers.

Reference ( 114 ) 〈TOP〉

2. Gratzel, M. Journal of Photochemistry and Photobiology C: Photochemistry Reviews 2003, 4, (2), 145-153.
連結：
4. Yella, A.; Lee, H.-W.; Tsao, H. N.; Yi, C.; Chandiran, A. K.; Nazeeruddin, M. K.; Diau, E. W.-G.; Yeh, C.-Y.; Zakeeruddin, S. M.; Gratzel, M. Science 2011, 334, (6056), 629-634.
連結：
7. Luther, J. M.; Beard, M. C.; Song, Q.; Law, M.; Ellingson, R. J.; Nozik, A. J. Nano Letters 2007, 7, (6), 1779-1784.
連結：
32. Holman, M. W.; Adams, D. M. ChemPhysChem 2004, 5, (12), 1831-1836.
連結：
38. Prasad, V.; Semwogerere, D.; Eric, R. W. Journal of Physics: Condensed Matter 2007, 19, (11), 113102.
連結：

Altmetrics

〈TOP〉

E-mail ：

When an article is available to download, a notice will be sent to your mailbox address.

E-mail ：