title: Synthesis of core/shell nanoparticles of Au/CdSe via Au-Cd bialloy precursor.
abstract: We present a novel method for the preparation of ultrasmall Au/CdSe core/shell particles. Au-Cd bialloy particles of 4.7 nm diameter were prepared as the precursor. The Cd component in the precursor reacted with the Se source at a temperature of 205 degrees C and was heated to 250 degrees C, leading to formation of a Au/CdSe core/shell structure. The sizes of Au/CdSe nanoparticles have a narrow distribution with an average size of 6.0 nm and Au core of 2.2 nm diameter. The X-ray diffraction pattern and the images of the high-resolution electron transmission microscopy show that the Au cores and the CdSe shells of Au/CdSe core/shell nanoparticles are both well crystallized, and the CdSe shells are in a cubic phase. The absorption spectrum of the Au/CdSe nanoparticles combines the absorption behaviors of the Au cores and the CdSe shells.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Zeng
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Wang
authors.forename: Shuyuan
authors.initials: S
authors.lastname: Zhang
authors.forename: J G
authors.initials: JG
authors.lastname: Hou