Nano Archive

Shell-Controlled Photoluminescence in CdSe/CNT Nanohybrids

Si, Hua-Yan and Liu, Cai-Hong and Xu, Hua and Wang, Tian-Ming and Zhang, Hao-Li (2009) Shell-Controlled Photoluminescence in CdSe/CNT Nanohybrids. Nanoscale Research Letters, 4 (10). pp. 1146-1152. ISSN 1931-7573 (Print) 1556-276X (Online)

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A new type of nanohybrids containing carbon nanotubes (CNTs) and CdSe quantum dots (QDs) was prepared using an electrostatic self-assembly method. The CdSe QDs were capped by various mercaptocarboxylic acids, including thioglycolic acid (TGA), dihydrolipoic acid (DHLA) and mercaptoundecanoic acid (MUA), which provide shell thicknesses of ~5.2, 10.6 and 15.2 Å, respectively. The surface-modified CdSe QDs are then self-assembled onto aridine orange-modified CNTs via electrostatic interaction to give CdSe/CNT nanohybrids. The photoluminescence (PL) efficiencies of the obtained nanohybrids increase significantly with the increase of the shell thickness, which is attributed to a distance-dependent photo-induced charge-transfer mechanism. This work demonstrates a simple mean for fine tuning the PL properties of the CdSe/CNT nanohybrids and gains new insights to the photo-induced charge transfer in such nanostructures.

Item Type:Article
Uncontrolled Keywords:Carbon nanotubes - CdSe - Nanohybrids - Photoluminescence - Charge transfer
Subjects:Physical Science > Nanophysics
Material Science > Nanofabrication processes and tools
Technology > Nanotechnology and energy applications
Physical Science > Photonics
ID Code:7139
Deposited By:Lesley Tobin
Deposited On:02 Nov 2009 11:38
Last Modified:02 Nov 2009 11:38

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