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题名:
Size-control growth of thermally stable Au nanoparticles encapsulated within ordered mesoporous carbon framework
作者: Wang, S; Wang, J; Zhu, XJ; Wang, JQ; Terasaki, O; Wan, Y
刊名: CHINESE JOURNAL OF CATALYSIS
出版日期: 2016
卷号: 37, 期号:1, 页码:61—72
关键词: LIQUID-PHASE OXIDATION ; DISPERSED GOLD NANOPARTICLES ; COUPLING REACTION ; CHEMOSELECTIVE HYDROGENATION ; SELECTIVE SYNTHESIS ; AGGREGATION-FREE ; SUPPORTED GOLD ; CATALYSTS ; SILICA ; EPOXIDATION
DOI: 10.1016/S1872-2067(15)60917-2
通讯作者: Wan, Y (reprint author), Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Educ Minist, Key Lab Resource Chem, Shanghai 200234, Peoples R China.
文章类型: 期刊文献
英文摘要: Simultaneously controlling the size of Au nanoparticles and immobilizing their location to specific active sites while hindering migration and sintering at elevated temperatures is a current challenge within materials chemistry. Typical methods require the use of protecting agents to control the properties of Au nanoparticles and therefore it is difficult to decouple the influence of the protecting agent and the support material. By functionalizing the internal surface area of mesoporous carbon supports with thiol groups and implementing a simple acid extraction step, we are able to design the resulting materials with precise control over the Au nanoparticle size without the need for the presence of any protecting group, whilst simultaneously confining the nanoparticles to within the internal porous network. Monodispersed Au nanoparticles in the absence of protecting agents were encapsulated into ordered mesoporous carbon at various loading levels via a coordination-assisted self-assembly approach. The X-ray diffractograms and transmission electron microscopy micrographs show that the particles have controlled and well-defined diameters between 3 and 18 nm at concentrations between 1.1 and 9.0 wt%. The Au nanoparticles are intercalated into the pore matrix to different degrees depending on the synthesis conditions and are stable after high temperature treatment at 600 degrees C. N-2 adsorption-desorption isotherms show that the Au functionalized mesoporous carbon catalysts possess high surface areas (1269-1743 m(2)/g), large pore volumes (0.78-1.38 cm(3)/g) and interpenetrated, uniform bimodal mesopores with the primary larger mesopore lying in the range of 3.4-5.7 nm and the smaller secondary mesopore having a diameter close to 2 nm. X-ray absorption near extended spectroscopy analysis reveals changes to the electronic properties of the Au nanoparticles as a function of reduced particle size. The predominant factors that significantly determine the end Au nanoparticle size is both the thiol group concentration and subjecting the as-made materials to an additional concentrated sulfuric acid extraction step. (C) 2016, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000368043100008
ISSN号: 0253-9837
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25834
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Wang, S,Wang, J,Zhu, XJ,et al. Size-control growth of thermally stable Au nanoparticles encapsulated within ordered mesoporous carbon framework[J]. CHINESE JOURNAL OF CATALYSIS,2016-01-01,37(1):61—72.
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