Composite Coating on Au Inverse Opals As a Highly-Sensitive Enzyme-Free

Abstract

The detection of hydrogen peroxide (H2O2) is of practical importance due to its involvement in the functioning and signal transduction of living cells. Various electrochemical techniques have been explored using either enzymatic or non-enzymatic sensors. In particular, non-enzymatic biosensors have attracted considerable attention because of their impressive stability and reproducibility. In addition, they are less susceptible to environmental interferences. However, the primary drawback of non-enzymatic sensors is poor sensitivity and selectivity. Hence, we want to address this issue by fabricating Cu2O in an inverse opaline structure. Our process involves the preparation of Au inverse opals serving as a three-dimensional ordered macroporous conductive substrate that allows an excessive surface area and sufficient porosity for mass transport. The Cu2O is electrodeposited on the Au inverse opals for the detection of H2O2. Comprehensive electrochemical analysis and materials characterization are conducted and discussed.