Báo cáo hóa học: " Shell-Controlled Photoluminescence in CdSe/CNT Nanohybrids"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Shell-Controlled Photoluminescence in CdSe/CNT Nanohybrids | Nanoscale Res Lett 2009 4 1146-1152 DOI S11671-009-9373-Z NANO EXPRESS Shell-Controlled Photoluminescence in CdSe CNT Nanohybrids Hua-Yan Si Cai-Hong Liu Hua Xu Tian-Ming Wang Hao-Li Zhang Received 9 May 2009 Accepted 3 June 2009 Published online 14 June 2009 to the authors 2009 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 and A respectively. The surface-modified CdSe QDs are then selfassembled 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. Keywords Carbon nanotubes CdSe Nanohybrids Photoluminescence Charge transfer Introduction Recently nanohybrids containing both semiconductor quantum dots QDs and carbon nanotubes CNTs have been the subject of great interest as a consequence of the development of methods for the chemical modification of CNTs and the seeking for novel functional materials 1-4 . . Si . Liu H. Xu . Wang . Zhang H State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University 730000 Lanzhou China e-mail Attachment of QDs onto conducting CNTs would place a metallic wire in direct chemical contact with the QDs surface. The metallic CNTs could then promote direct charge transport and efficient charge transfer from the .

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