title: Shell-Controlled Photoluminescence in CdSe/CNT Nanohybrids.
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.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, 730000, Lanzhou, China. Haoli.zhang@lzu.edu.cn.
authors.forename: Hua-Yan
authors.initials: HY
authors.lastname: Si
authors.forename: Cai-Hong
authors.initials: CH
authors.lastname: Liu
authors.forename: Hua
authors.initials: H
authors.lastname: Xu
authors.forename: Tian-Ming
authors.initials: TM
authors.lastname: Wang
authors.forename: Hao-Li
authors.initials: HL
authors.lastname: Zhang