Zero- versus One-Dimensional Water-Soluble CdTe Nanocrystals-Synthesis and Photophysical Characterization

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• 作者：Christian Schulz-Drost ; Vito Sgobba ; Dirk M. Guldi
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：July 12, 2007
• 年：2007
• 卷：111
• 期：27
• 页码：9694 - 9703
• 全文大小：1102K
• 年卷期：v.111,no.27(July 12, 2007)
• ISSN：1932-7455

文摘

This work demonstrates the systematic development and characterization of water-soluble one-dimensionalnanorods of CdTe (QR) with the assistance of a mixed ligand system, namely, a combination of2-(dimethylamino)ethanethiol and cysteine, that both serve as surface stabilizers. Their characterization hasbeen accomplished by means of a wide range of microscopic and photophysical techniques. The correspondingthree-dimensional quantum dots of CdTe (QD) emerged as important reference systems, especially for thedifferent photophysical assays. The latter were exclusively formed when just 2-(dimethylamino)ethanethiolwas used as surface stabilizer. A maximum photoluminescence quantum yield of 25% was estimated for QRsamples that were refluxed in water for approximately 11 h. Such remarkably high quantum yields, whichare appreciably higher than what is seen for the analogous QD, point to a successful control over defects,trapping states, etc. In line with this trend is the observation that the excited-state lifetime of the QR is longerthan in analogous QD.