An accurate monitoring platform for the surface catalysis of nanozyme validated by surface-enhanced Raman-knietics model

Analytical Chemistry
Sisi WenYukihiro Ozaki

Abstract

Surface-enhanced Raman scattering (SERS) is a super-sensitive technique for monitoring catalytic reactions. However, building a SERS-kinetics model to investigate catalytic efficiency on the surface or interface of catalyst remains a great challenge. In the present study, we successfully obtained an excellent semiconducting SERS substrate, reduced MnCo2O4 (R-MnCo2O4) nanotubes, whose favourable SERS sensitivity is mainly related to the promoted interfacial charge transfer caused by the introduction of oxygen vacancies as well as electromagnetic enhancement effect. Furthermore, the R-MnCo2O4 nanotubes showed a favourable oxidase-like activity towards oxidation with the aid of molecular oxygen. It was also showed the oxidase-like catalytic process could be monitored using the SERS technique. A new SERS-kinetics model to monitor the catalytic efficiency of the oxidase-like reaction was developed, the results demonstrate that the Vm values measured by the SERS-kinetics method are close to that obtained by the UV-vis approach, while the Km values measured by the SERS-kinetics method are much lower, demonstrating the better affinity between the enzyme and the substrate from SERS results and further confirming the high sensitivity of ...Continue Reading

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