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- Title
Shell-Controlled Photoluminescence in CdSe/CNT Nanohybrids.
- Authors
Si, Hua-Yan; Liu, Cai-Hong; Xu, Hua; Wang, Tian-Ming; Zhang, Hao-Li
- Abstract
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.
- Subjects
CARBON nanotubes; QUANTUM dots; NANOSTRUCTURES; PHOTOLUMINESCENCE; MOLECULAR self-assembly; ELECTROSTATICS; CHARGE transfer
- Publication
Nanoscale Research Letters, 2009, Vol 4, Issue 10, p1146
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1007/s11671-009-9373-z