Camargo Pedro H C, Lee Young Hwan, Jeong Unyong, Zou Zhiqing, Xia Younan
Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA.
Langmuir. 2007 Mar 13;23(6):2985-92. doi: 10.1021/la0632070. Epub 2007 Jan 30.
This paper describes a cation exchange approach to the synthesis of metal chalcogenide core-shell particles with the same size but a number of different compositions. This method begins with the preparation of colloidal spheres of amorphous Se (a-Se), followed by their reaction with Ag atoms to form Se@Ag2Se spheres. These core-shell spheres are then converted into Se@MSe (M = Zn, Cd, and Pb) via cation exchange with Zn2+, Cd2+, and Pb2+. All the colloidal spheres prepared using this method are monodispersed in size and characterized by a spherical shape and a smooth surface. Starting from the same batch of Se@Ag2Se, the resultant Se@MSe samples were essentially the same in size. Furthermore, these core-shell colloidal spheres can be easily made superparamagnetic by incorporating Fe3O4 nanoparticles into the a-Se cores. This synthetic approach provides a simple and versatile route to magnetoactive core-shell spheres with the same size but a range of different compositions. This study also implies that it is feasible to further increase the diversity of cations that can be used in the cation exchange of a colloidal system to produce multifunctional core-shell spheres with a variety of properties.
本文描述了一种阳离子交换方法，用于合成尺寸相同但组成不同的金属硫族化物核壳颗粒。该方法首先制备非晶态硒（a-Se）的胶体球，然后使其与银原子反应形成Se@Ag2Se球。接着，通过与Zn2+、Cd2+和Pb2+进行阳离子交换，将这些核壳球转化为Se@MSe（M = Zn、Cd和Pb）。使用该方法制备的所有胶体球尺寸均一，呈球形且表面光滑。从同一批Se@Ag2Se开始，所得的Se@MSe样品尺寸基本相同。此外，通过将Fe3O4纳米颗粒掺入a-Se核中，这些核壳胶体球可以很容易地制成超顺磁性。这种合成方法为制备尺寸相同但组成多样的磁活性核壳球提供了一条简单且通用的途径。该研究还表明，进一步增加可用于胶体体系阳离子交换的阳离子多样性，以生产具有各种性质的多功能核壳球是可行的。
