ZnO Nanowires Coated with CuO Films as Highly Sensitive H_2S Sensors

摘要

The gas sensing characteristics of ZnO nanowires (NWs) coated with different thickness of CuO film have been investigated. ZnO NWs were grown on Si/SiO_2 by hydrothermal method and CuO films were deposited by thermal evaporation. It has been found that ZnO NWs exhibit characteristic n-type behavior upto a CuO thickness of 50 nm; whereas at higher thickness the samples show p-type behavior (typical of CuO). At a CuO thickness of 10 nm the sensitivity towards H_2S was 500% more as compared to pure ZnO NWs films. In addition, the operating temperature was reduced to 200°C.