DOI number:10.1016/j.snb.2014.04.072
Journal:sensors and actuators B
Key Words:Zinc oxide; Nanosheets; Hydrothermal; Gas sensor,Sensitivity
Abstract:ZnO nanosheet microstructures have been directly grown on Al2O3 tube electrode by one-step hydrothermal method with different reaction times (3 h, 8 h and 12 h). The crystalline phase, morphology, and structure of the nanosheets are characterized by FESEM, TEM/SAED, and XRD. The results of FESEM reveal that ZnO nanosheets exhibit a sheet networks structure and a lager surface area. TEM/SAED images show a rough surface and a polycrystalline structure of ZnO nanosheets. X-ray diffraction indicated the ZnO architectures are well crystallized in a hexagonal wurtzite structure. Gas sensing properties of the ZnO nanosheets show high response, fast response-recovery cuves and long-term stability to 25–1000 ppm ethanol at appropriate temperature (400 ℃), especially for sensor B (8 h). Moreover, the response of sensorB can get up to 38.4 for 100 ppm ethanol, and even 25 ppm ethanol could be well detected with a high response about 15 which is mainly attributed to the high surface area. This demonstrated the great potential application of ZnO nanosheets for developing gas sensors.
Indexed by:Journal paper
Discipline:Engineering
Document Type:J
Volume:201
Translation or Not:no
Date of Publication:2014-04-21
Included Journals:SCI
Links to published journals:https://doi.org/10.1016/j.snb.2014.04.072