標題: Self-Assembled Fernlike Microstructures of Polyhedral Oligomeric Silsesquioxane/Gold Nanoparticle Hybrids
作者: Lu, Chu-Hua
Kuo, Shiao-Wei
Huang, Chih-Feng
Chang, Feng-Chih
應用化學系
Department of Applied Chemistry
公開日期: 5-三月-2009
摘要: We have used a thiol-functionalized polyhedral oligomeric silsesquioxane (SH-POSS) as a protective group for the preparation of POSS-protected gold nanoparticles (POSS-Au NPs). The organic/inorganic hybrid SH-POSS NPs exhibited an interesting platelike morphology arising from steric hindrance between the isobutyl groups of SH-POSS. An XRD study of the SH-POSS crystal revealed the relatively large interstice (1.64 nm lattice constant a > 1.3 nm diameter SH-POSS) on the basal plane of the unit cell, which resulted in a platelike morphology having lateral dimensions on the order of a few micrometers and thicknesses of a few hundred nanometers. In addition to behaving as a stabilizer for the preparation of Au NPs, an excess of SH-POSS colloids led to the formation of a crystalline template that incorporated the POSS-Au hybrid NPs on its surface, providing a unique fernlike microstructure. After removal of the POSS template (through sublimation and decomposition to a silica char) at 350 degrees C in air for I h, nanosized Au islands having diameters of 50-100 nm and thicknesses of 2-20 nm were sintered onto the substrate. As a result, SH-POSS is an excellent protective group for the preparation of Au NPs of high stability in the powder state. In addition, we suspect that SH-POSS crystals could be used to disperse Au NPs onto substrates for a wide range of applications (e.g., Au catalysts).
URI: http://dx.doi.org/10.1021/jp808635j
http://hdl.handle.net/11536/7502
ISSN: 1932-7447
DOI: 10.1021/jp808635j
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 113
Issue: 9
起始頁: 3517
結束頁: 3524
顯示於類別:期刊論文


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