Web Release Date: January 29,
Facile Synthesis of Semiconductor and Noble Metal Nanocrystals in High-Boiling Two-Phase Liquid/Liquid Systems
and
Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry, the Chinese Academy of Sciences, Beijing 100080, China, and Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
Received: August 24, 2007
In Final Form: November 25, 2007
Abstract:
Novel high-boiling liquid/liquid systems were introduced for the synthesis of semiconductor and noble metal nanocrystals. Polyols and long-chain hydrocarbons were utilized to form such two-phase systems. Because of the high-boiling nature, these systems may be conveniently employed for nanocrystal synthesis at relatively high temperatures (under the normal pressure) and thus are useful alternatives to toluene/water. CdS and Ag nanocrystals were successfully prepared in an octadecene (ODE)/glycerol system via interfacial processes, demonstrating the effectiveness of this class of two-phase systems. As-prepared nanocrystals had hydrophobic surfaces and were dispersed in the ODE phase of the system. Furthermore, a congeneric two-phase system of liquid paraffin/glycerol was also found to be effective for the synthesis of CdS and Ag nanocrystals.
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