High Performance of Gas Sensor Based on Novel Cu-Based Binary Composite Phase-Modified ZnO

Abstract

Novel Cu-based binary composite phases were synthesized with an octadecylamine (ODA) synthetic system. HR-TEM was used to characterize the binary composite phase indicating that the Cu-based binary composite phase was a mixed phase of two oxides. ZnO gas sensing films decorated with Cu-based binary composite phase were parallel fabricated. The gas sensing performance to nitric oxides (NO, N2O, NO[Formula: see text] was studied. Cu–Mo–O binary composite phase-modified ZnO was screened out with high sensitivity and selectivity to NO. The gas sensing response to 0.5 ppm NO was 128.1. The detection limit of Cu–Mo–O binary composite phase-modified ZnO to NO was less than 10 ppb. Cu–Mo–O binary composite phase-modified ZnO also shows good selectivity to NO even using NO2 as interference gas. It is of great importance for the detection of NO.