Unique Microstructure of Mesoporous Pt (HI-Pt) Prepared via Direct Physical Casting in Lyotropic Liquid Crystalline Media
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- 作者：Yusuke Yamauchi ; Toshiyuki Momma ; Minekazu Fuziwara ; Sivakumar Sadasivan Nair ; Tetsu Ohsuna ; Osamu Terasaki ; Tetsuya Osaka ; and Kazuyuki Kuroda
- 刊名：Chemistry of Materials
- 出版年：2005
- 出版时间：December 13, 2005
- 年：2005
- 卷：17
- 期：25
- 页码：6342 - 6348
- 全文大小：1707K
- 年卷期：v.17,no.25(December 13, 2005)
- ISSN：1520-5002
文摘
Two-dimensional hexagonally ordered mesoporous Pt particles are prepared by Pt deposition in theaqueous domains of lyotropic liquid crystals (LLC) by chemical reduction with Zn powders. Interestingly,the framework is composed of connected nanoparticles of about 3 nm in size. Moreover, it is proved thatthe lattice fringes on the atomic crystallinity are coherently extended across the several nanoparticles inthe framework. Such a framework composed of connected nanoparticles with extended crystallinity isuniquely created by using LLC as a soft template, which is not attainable by a traditional approach usingmesoporous silica as a hard template. Through the structural identification, the formation mechanism ofmesoporous Pt in the presence of LLC is thought to be continuous deposition of Pt nanoparticles fromone nanoparticle.