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Title: Fabrication of Au 25(SG) 18–ZIF-8 Nanocomposites: A Facile Strategy to Position Au 25(SG) 18 Nanoclusters Inside and Outside ZIF-8

Multifunctional composite materials are currently highly desired for sustainable energy applications. A general strategy to integrate atomically precise Au 25(SG) 18 with ZIF-8 (Zn(MeIm) 2, MeIm = 2-methylimidazole), is developed in this paper via the typical Zn-carboxylate type of linkage. Au 25(SG) 18 are uniformly encapsulated into a ZIF-8 framework (Au 25(SG) 18@ZIF-8) by coordination-assisted self-assembly. In contrast, Au 25(SG) 18 integrated by simple impregnation is oriented along the outer surface of ZIF-8 (Au 25(SG) 18/ZIF-8). The porous structure and thermal stability of these nanocomposites are characterized by N 2 adsorption–desorption isothermal analysis and thermal gravimetric analysis. The distribution of Au 25(SG) 18 in the two nanocomposites is confirmed by electron microscopy, and the accessibility of Au 25(SG) 18 is evaluated by the 4-nitrophenol reduction reaction. The as-prepared nanocomposites retain the high porosity and thermal stability of the ZIF-8 matrix, while also exhibiting the desired catalytic and optical properties derived from the integrated Au 25(SG) 18 nanoclusters (NCs). Au 25(SG) 18@ZIF-8 with isolated Au 25 sites is a promising heterogenous catalyst with size selectivity imparted by the ZIF-8 matrix. Finally, the structural distinction between Au 25(SG) 18@ZIF-8 and Au 25(SG) 18/ZIF-8 determines their different emission features, and provides a newmore » strategy to adjust the optical behavior of Au 25(SG) 18 for applications in bioimaging and biotherapy.« less
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [1] ;  [1]
  1. Sun Yat-Sen Univ., Guangzhou (China). School of Chemistry. Key Lab. of Environment and Energy Chemistry of Guangdong Higher Education Inst.
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Chemical Science Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Materials Science and Technology Division
  4. Sun Yat-Sen Univ., Guangzhou (China). Instrumental Analysis and Research Centre
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 2014CB845600; 21643017; 21720102007; 2016A030313268; S2013030013474; 201504010031; 17lgzd18
Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 30; Journal Issue: 6; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Research Org:
Sun Yat-Sen Univ., Guangzhou (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC); 973 Program (China); Natural Science Foundation (NSF) of Guangdong Province (China); Fundamental Research Funds for the Central Universities (China)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 4-NP reduction; Au25(SG)18 nanocluster; fluorescence; nanocomposites; ZIF-8
OSTI Identifier:
1422599