Web Release Date: June 13,
Chemical Conjugation of Fullerene C60 to CdSe Nanocrystals via Dithiocarbamate Ligands
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Received: February 13, 2007
In Final Form: April 27, 2007
Abstract:
Buckminsterfullerenes have been conjugated to CdSe nanocrystals by exchanging trioctylphosphine oxide (TOPO) ligands on the CdSe nanocrystals with C60-bound dithiocarbamate ligands. To improve solubility of the C60-capped CdSe nanocrystals, a small molecular weight dithiocarbamate ligand was used as the coligand in the ligand-exchange reaction. The as synthesized (C60)8-CdSe conjugates were purified by dialysis against ethanol and characterized by 1H NMR, UV-vis, and transmission electron microscopy. Photoelectrochemistry of a film cast from the (C60)8-CdSe conjugate revealed a significantly enhanced photocurrent compared with the film of CdSe-TOPO nanocrystals as well as that of C60 alone, suggesting that our conjugation strategy is viable for efficient photoinduced charge separation, transport, and collection.
Download the full text: PDF | HTML
