Synthesis and Characterization of Sn/R, Sn/Si-R, and Sn/SiO2 Core/Shell Nanoparticles

详细信息    查看全文

• 作者：Chung-Sung Yang ; Qi Liu ; Susan M. Kauzlarich ; and Brian Phillips
• 刊名：Chemistry of Materials
• 出版年：2000
• 出版时间：April 2000
• 年：2000
• 卷：12
• 期：4
• 页码：983 - 988
• 全文大小：362K
• 年卷期：v.12,no.4(April 2000)
• ISSN：1520-5002

文摘

Nanometer-sized tin, Sn/R, and Sn/Si-R (R = n-C₄H₉), core/shell nanoparticles have beenprepared by the reaction of SnCl₄ or SiCl₄ with Mg₂Sn in ethylene glycol dimethyl ether(glyme) and subsequently with n-C₄H₉Li. Sn/SiO₂ core/shell nanoparticles are produced fromthe reaction of Mg₂Sn with SiCl₄ and subsequent reaction with H₂O₂. Fourier transformInfrared (FTIR) spectra are consistent with n-butyl surface termination for the n-butyl-capped tin (Sn/n-butyl) and the silicon-n-butyl capped tin (Sn/Si-n-butyl) core/shell nanoparticles. High-resolution transmission electron microscope (HRTEM) confirms that the corepart of Sn/n-butyl and Sn/Si- n-butyl nanoparticles is consistent with the tetragonal structureof tin, exhibiting lattice fringes of the {200} crystal plane (2.92 Å). The FTIR spectrum ofSn/SiO₂ confirms the evidence of silica capping and selected area electron diffraction (SAED)is consistent with an amorphous shell (SiO₂) and crystalline Sn core. Solid-state nuclearmagnetic resonance (NMR) spectra and X-ray powder diffraction (XRD) pattern providesupporting evidence for the tetragonal structure of mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-tin as the core part of Sn/SiO₂nanoparticles. The typical size distribution of Sn/n-butyl, Sn/Si-n-butyl, and Sn/SiO₂nanoparticles (diameter) range from 7 to 15 nm derived from TEM micrographs. The averageradius ratio (Rr) value, (radius of SiO₂/radius of Sn) for Sn/SiO₂ derived from 24 individualnanoparticles in TEM images is 0.17 (0.02).