Enhanced Humidity-Sensitive Properties of Novel Graphene/Zinc Oxide Nanocomposite Films

摘要

A highly sensitive humidity sensor composed of G/ZnO-layered films was analyzed. The sensor was characterized through X-ray diffraction and transmission electron microscopy. The response characteristics, such as hysteresis, response time, and recovery time, of the sensor to humidity were investigated experimentally and theoretically. The experimental data revealed linear function relationships between impedance shifts in the sensor and variations in relative humidity. Furthermore, the developed sensor exhibited higher sensitivity (S = 468) and the 5 wt% G/ZnO nanocomposite film had more favorable humidity sensing properties than that the other films displayed. In addition, the response and recovery time were 5 and 90 s, respectively, and the humidity hysteresis value was low (1.5%) at all humidities. Therefore, the humidity sensor has potential for applications in the field of humidity control.