Ag-Au alloy nanoparticles: Synthesis and in situ monitoring SERS of plasmonic catalysis

作者：Han, Qingyan; Zhang, Chengyun; Gao, Wei; Han, Zhihang; Liu, Tingzhuo; Li, Caixia; Wang, Zhaojin; He, Enjie; Zheng, Hairong^*

来源：Sensors and Actuators B: Chemical , 2016, 231: 609-614.

DOI：10.1016/j.snb.2016.03.068

• Au-Ag alloy nanoparticles
• Surface plasmon resonance
• Surface-enhanced Raman scattering
• Plasmonic catalysis

Noble metal nanostructures are currently of great interest for their unique plasmonic property and potential applications in catalysis and surface-enhanced spectroscopy. However, the application of plasmonic nanostructures for quantitatively in situ SERS monitoring of the catalytic reaction has been a great challenge for investigators because combining plasmonics with catalysis requires the same kind of noble metal nanoparticles (NPs) in two very different size regimes. Herein, We have demonstrated a facile wet chemical method to synthesize Au-Ag alloy plasmonic NPs that could combine the desired plasmonic and catalytic properties with same NPs. The catalytic activity of Au-Ag alloy NPs using the reduction of 4-nitrothiophenol (4-NTP) by sodium borohydride (NaBH4) is chosen as a model reaction. The signals of the reaction processes are detected and identified through in situ SERS spectroscopy with high sensitivity. The insights gained by current study may serve as a promising and powerful technique for better investigation in the heterogeneous catalysis. Moreover, the reduction of aromatic nitro compounds with prepared Au-Ag alloy NPs also provides potential application in sewage treatment.

• 出版日期2016-8
• 单位陕西师范大学