A facile one-pot method has been developed to synthesize uniform gold@mesoporous silica nanospheres （Au@MSNs）, which have a well-defined core-shell structure with ordered mesoporous silica as a shell. The resulting ...A facile one-pot method has been developed to synthesize uniform gold@mesoporous silica nanospheres （Au@MSNs）, which have a well-defined core-shell structure with ordered mesoporous silica as a shell. The resulting Au@MSNs have a high surface area （-521 rna/g） and uniform pore size （-2.5 nm） for the mesoporous silica shell. The diameter of the gold core can be regulated by adjusting the amount of HAuC14. The catalytic performance of the Au@MSNs was investigated using the reduction of 4-nitrophenol as a model reaction. The mesopores of the silica shells provide direct access for the reactant molecules to diffuse and subsequently interact with the gold cores. In addition, the Au@MSNs display the great advantage of sintering-resistance to 950 ℃ because the mesoporous silica shells inhibit aggregation or deformation of the gold cores. The high thermal stability enables the Au@MSNs to be employed in high-temperature catalytic reactions.展开更多
基金This work was supported by the National Basic Research Program （973 Project） of China （Nos. 2013CB934104 and 2012CB224805）, the National Natural Science Foundation of China （No. 21210004）, the Shanghai Leading Academic Discipline Project （B108）, and the Science and Technology Commission of Shanghai Municipality （No. 08DZ2270500）.
文摘A facile one-pot method has been developed to synthesize uniform gold@mesoporous silica nanospheres （Au@MSNs）, which have a well-defined core-shell structure with ordered mesoporous silica as a shell. The resulting Au@MSNs have a high surface area （-521 rna/g） and uniform pore size （-2.5 nm） for the mesoporous silica shell. The diameter of the gold core can be regulated by adjusting the amount of HAuC14. The catalytic performance of the Au@MSNs was investigated using the reduction of 4-nitrophenol as a model reaction. The mesopores of the silica shells provide direct access for the reactant molecules to diffuse and subsequently interact with the gold cores. In addition, the Au@MSNs display the great advantage of sintering-resistance to 950 ℃ because the mesoporous silica shells inhibit aggregation or deformation of the gold cores. The high thermal stability enables the Au@MSNs to be employed in high-temperature catalytic reactions.
