Quantitative label-free and real-time surface-enhanced Raman scattering monitoring of reaction kinetics using self-assembled bifunctional nanoparticle arrays.
Although surface-enhanced Raman scattering (SERS) has proven to be an effective tool for label-free monitoring of catalytic reactions, quantitative characterization of reaction kinetics via this technique remains challenging owing to the difficulty in integrating catalytic and plasmonic activities into a single platform. In this work, we report on an easy access to highly sensitive plasmonic nanoarrays for direct and label-free monitoring of a gold-catalyzed reaction by SERS. The hierarchically structured three-dimensional assemblies, which consist of small gold catalyst nanoparticles distributed on a self-assembled monolayer of larger gold nanoparticles, were formed through a simple and rapid stepwise interfacial self-assembling process (fabrication time <10 min). The well-defined interparticle distances (<1 nm) lead to efficient plasmonic coupling and ensure both catalytic and SERS-active sites exposed to the environment. Such a versatile bifunctional platform thus allows quantitative determination of the rate constant and activation energy of the catalytic reaction with SERS.
Department of Chemistry, State Key Lab of Molecular Engineering of Polymers and Institutes of Biomedical Sciences, Fudan University , Shanghai 200433, China.
Kun
K
Zhang
Department of Chemistry, State Key Lab of Molecular Engineering of Polymers and Institutes of Biomedical Sciences, Fudan University , Shanghai 200433, China.
Jingjing
J
Zhao
Department of Chemistry, State Key Lab of Molecular Engineering of Polymers and Institutes of Biomedical Sciences, Fudan University , Shanghai 200433, China.
Ji
J
Ji
Department of Chemistry, State Key Lab of Molecular Engineering of Polymers and Institutes of Biomedical Sciences, Fudan University , Shanghai 200433, China.
Yixin
Y
Li
Department of Chemistry, State Key Lab of Molecular Engineering of Polymers and Institutes of Biomedical Sciences, Fudan University , Shanghai 200433, China.
Baohong
B
Liu
D002623:Chemistry Techniques, Analytical / Q000295:instrumentation* / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D007553:Isotope Labeling; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013499:Surface Properties
D006046:Gold