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题名: One-phase controlled synthesis of Au-25 nanospheres and nanorods from 1.3 nm Au : PPh3 nanoparticles: the ligand effects
作者: Lin, Jizhi1, 2, 3;  Li, Weili4;  Liu, Chao1, 2;  Huang, Pan1, 2;  Zhu, Manzhou3;  Ge, Qingjie4;  Li, Gao1, 2
刊名: NANOSCALE
发表日期: 2015
DOI: 10.1039/c5nr02638e
卷: 7, 期:32, 页:13663-13670
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary ;  Physics, Applied
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science ;  Physics
英文摘要: We report the controlled synthesis of [Au-25(PPh3)(10)(SR1)(5)X-2](2+) nanorods (H-SR1: alkyl thiol, H-SC2H4Ph and H-S(n-C6H13)) and Au-25(SR2)(18) nanospheres (H-SR2: aromatic thiol, H-SPh and H-SNap) under the one-phase thiol etching reaction of the polydisperse Au-n(PPh3)(m) parent-particles (core diameter: 1.3 +/- 0.4 nm, 20 < n < 50). These as-obtained gold nanoclusters are identified by UV-vis spectroscopy and matrix-assisted laser desorption ionization mass spectrometry. Furthermore, the conversion process, from Au-n(PPh3)(m) nanoparticles to Au-25(SNap)(18) nanospheres, is monitored by UV-vis spectroscopy. It is observed that the Au-25(PPh3)(10)(SR1)(5)X-2 nanorods cannot convert to Au-25(SR)(18) nanospheres in the presence of excess thiol (both the alkyl and aromatic thiol) even under thermal conditions (e.g., 55 and 80 degrees C), indicating that both the Au-25 nanorods and nanospheres are in a stable state during the alkyl and aromatic thiol etching reactions, respectively. The two different conversion pathways (i.e., to Au-25(PPh3)(10)(SR1)(5)X-2 nanorods and Au-25(SR2)(18) nanospheres) mainly are attributed to the different electronic properties and the steric effects of the alkyl and aromatic thiol ligands. The significant ligand effect also is observed in catalytic CO oxidation. The Au-25(SC2H4Ph)(18)/CeO2 catalyst shows catalytic activity at 80 degrees C and reaches up to 80.7% and 98.5% (based on CO conversion) at 100 and 150 degrees C, while Au-25(SNap)(18)/CeO2 and Au-25(PPh3)(10)(SC2H4Ph)(5)X-2/CeO2 give rise to a low activity at 100 degrees C with only 3.3% and 10.2% CO conversion and 98.0% and 94.6% at 150 degrees C.
关键词[WOS]: CRYSTAL-STRUCTURE ;  GOLD NANOCLUSTER ;  CO OXIDATION ;  OPTICAL-PROPERTIES ;  GROWTH-MECHANISM ;  CLUSTERS ;  AU-25(SCH2CH2PH)(18) ;  CONVERSION ;  CATALYSTS
语种: 英语
WOS记录号: WOS:000359234100045
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146450
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Gold Catalysis Researcher Ctr, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
3.Anhui Univ, Coll Chem & Chem Engn, Hefei 230601, Peoples R China
4.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy DNL, Dalian 116023, Peoples R China

Recommended Citation:
Lin, Jizhi,Li, Weili,Liu, Chao,et al. One-phase controlled synthesis of Au-25 nanospheres and nanorods from 1.3 nm Au : PPh3 nanoparticles: the ligand effects[J]. NANOSCALE,2015,7(32):13663-13670.
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