Abstract
Exploring of an efficient and cheap-cost peroxidase mimic is crucial for constructing a colorimetric sensing platform. Herein, a series of Ag-decorated CoO nanoparticles (Ag-CoO NPs) were synthesized by a facile one-pot solvothermal strategy and followed by heat treatment. The compositions and morphologies of the as-prepared catalysts were characterized by XRD, N2-adsorption/desorption, SEM, TEM, XPS, UV–vis diffuse reflectance and transient photocurrent techniques. The core-shell structured 0.10Ag-CoO NPs (molar ratio of AgNO3/Co(NO3)2 = 0.10) with high dispersion possess large specific surface area (156.8 cm2 g−1) and rich mesoporous structure, thus providing more catalytic active sites. Suitable Ag decoration not only increases the surface active oxygen species and strengthens the visible light respond but also improves the separation of photo-generated electron–hole pairs of 0.10Ag-CoO NPs. As a result, 0.10Ag-CoO NPs exhibit superior peroxidase-like activity for 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation in the presence of H2O2 compared to pure CoO NPs and the other nanoparticles. Then a sensitive and selective colorimetric sensing platform was constructed for detecting hydrogen peroxide and o-phenylenediamine. Finally, the possible catalytic mechanism was also proposed here.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
