Architecture of DNA–Multiwalled Carbon Nanotubes–Silver Nanoparticles Composites–Modified Glassy Carbon Electrode for Hydrogen Peroxide Detection

摘要

Sensitive and accurate determination of a small quantity of hydrogen peroxide (H2O2) is of great importancenin environmental analysis. In this article, a novel strategy for fabrication of H2O2 sensor was developed bynelectrodepositing silver nanoparticles (Ag NPs) on a DNA–multiwalled carbon nanotubes (DNA-MWCNTs)ncomposites–modified glassy carbon electrode. Experimental results showed that the constructed electrodenhad an excellent catalytic ability for the reduction of H2O2, suggesting that it could be used as a sensor tondetect H2O2. The good catalytic activity was ascribed to the DNA-MWCNTs composites that resulted in thenformation of small Ag NPs and homogenous distribution of these Ag NPs. The sensor showed a highnsensitivity, wide linear range, and good stability, and thus it could be used as an ideal tool in environmentalnengineering.