NANOSTRUCTURED ZnCo_2O_4THICK FILM AS AN ETHANOL SENSOR

摘要

Semiconductive nanometer-size material ZnCo_2O_4 was synthesized by a solution combustion reaction of inorganic reagents of Zn(NO_3)_3. 6H_2O, Co(NO_3)_3.6H_2O and glycine as a fuel. The process was a convenient, environment friendly, inexpensive and efficient preparation method for the ZnCo_2O_4 nanomaterial. The synthesized materials were characterized by TG/DTA, XRD, EDX, SEM, and TEM. Conductance responses of the nanocrystalline ZnCo_2O_4 thick film were measured by exposing the film to reducing gases like Acetone, Ethanol and CO_2. It was found that the sensors exhibited various sensing responses to these gases at different operating temperature. Furthermore, the sensor exhibited a fast response and a good recovery. The results demonstrated that ZnCo_2O_4 can be used as a new type of gas-sensing material which has a high sensitivity and good selectivity to Ethanol 200 ppm.