Precise real-time quantification for photocatalytic reaction: integration of the sensitive in-situ SERS sensor and high-efficiency photocatalyst

摘要

Recently, in-situ surface-enhanced Raman spectroscopy (SERS) is gradually becoming an important method for monitoring photocatalytic reaction processes, in which the quantification potential is a vital factor in determining whether this technology can be truly applied in the future. In order to improve the quantification performance of in-situ SERS and explore a precise operando Raman detection for photocatalytic reactions, an architecture of heterostructural Cu2O/ZnO/Ag nano round brush has been designed and discussed in this work. This structure is an integration of sensitive in-situ SERS sensor and high-efficiency photocatalyst, realizing real-time monitoring of photocatalytic reaction in a wide concentration range from 20 to 3 mg l(-1). The coefficient of determination between different detection methods is beyond 0.86 in this range, implying the high-precise quantification of this platform. Comprehensive analysis on structure effect, SERS performance, photocatalytic property, electric filed characteristic, etc were all systematically made and discussed in detail for this platform. This work presents a precise preliminar real-time photocatalytic monitoring using in-situ SERS detection, which is a new attempt and also meaningful reference for other in-situ analytical technology.