Synthesis of stable Au-SiO2 composite nanospheres with good catalytic activity and SERS effect.
For improving stability and efficiency of noble metal nanomaterials, a straightforward one-step method was developed to synthesize Au-SiO2 composite nanospheres. Monodisperse hybrid silica nanospheres that had anilino-methyl on the surfaces were prepared first. The as-prepared hybrid silica nanospheres were then used to obtain Au nanocrystal through the redox reaction of HAuCl4 and anilino-methyl. This approach led to a better utilization of Au. By adjusting the surface morphologies and the particle sizes, the functional nanospheres displayed different surface-enhanced Raman scattering effects of Rhodamine 6G. The composite nanospheres showed high catalytic activity and good reusability in catalytic reduction of 4-nitrophenol because of their active gold surface.
State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, PR China; Department of Polymer Science and Engineering, Nanjing University, Nanjing 210093, PR China; Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, PR China. Electronic address: monica0520@gmail.com.
Weina
W
Wang
Department of Polymer Science and Engineering, Nanjing University, Nanjing 210093, PR China; Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, PR China. Electronic address: mengzhen@nju.edu.cn.
Zhen
Z
Meng
State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, PR China; Department of Polymer Science and Engineering, Nanjing University, Nanjing 210093, PR China; Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, PR China. Electronic address: chemzqh@nju.edu.cn.
Qiuhong
Q
Zhang
State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, PR China; Department of Polymer Science and Engineering, Nanjing University, Nanjing 210093, PR China; Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, PR China. Electronic address: jiaxd@nju.edu.cn.
Xudong
X
Jia
State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, PR China; Department of Polymer Science and Engineering, Nanjing University, Nanjing 210093, PR China; Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, PR China. Electronic address: xikai@nju.edu.cn.
Kai
K
Xi
Au; Catalytic activity; Composite nanospheres; SERS; Silica