Research on Film Type Acetone Sensor Based on Copper Oxide/Zinc Oxide Heterostructure Nanoflower

The copper oxide/zinc oxide (CuO/ZnO) heterostructure nanoflower was prepared by low-temperature hydrothermal method. A new film-type acetone gas sensor was designed by transferring CuO/ZnO nanoflower onto aluminum plate with platinum-inter digital electrodes using clip-coating method. The crystalline phase and microstructure of CuO/ZnO nanoflower were displayed using X-ray diffraction (XRD), scanning electron microscope (SEM) and high resolution transmission electron microscopy (HRTEM). Sensitive mechanism and electrochemical characteristic of CuO/ZnO were analyzed by X-ray photoelectron spectroscopy (XPS). These characteristic tests of acetone gas sensor were carried out on the traits of sensitive performance, temperature, dynamic response, selectivity and stability in gas sensor test system. The conclusion demonstrated that the acetone gas sensor based on CuO/ZnO nanoflower presented a good linear range (10-300 mg/m(3) acetone) at the operating temperature of 200 degrees C. Dynamic response time and recover time of sensor to 100 mg/m(3) acetone were 1.8 and 10.7 s, respectively. This kind of sensor showed good antidisturbance to these gases, such as NO, CO, Formaldehyde , methanol and 1, 3 -butadiene. Standard deviation of acetone sensor response was 0.107 after it was applied continually on automobile about 50 days.