Abstract
In this study, pure ZnO (ZnO-1, ZnO-2) with two different morphologies, and graphene doped ZnO-2 (G-ZnO-2) were synthesized using a simple hydrothermal process at 150 °C. The formaldehyde gas sensing performance of the G-ZnO-2 composite, synthesized by an in-situ method was investigated. The morphologies and the structures of the nanomaterials were characterized by X-ray diffraction, field emission scanning electronic microscopy, and transmission electron microscopy. The experimental results indicate that the G-ZnO-2 based sensor exhibits unique advantages for the sensing of formaldehyde gas at concentrations in the range of 2 to 2000 ppm, such as fast response/recovery time and good selectivity, at an optimal working temperature of 200 °C. The improved sensing performance of the G-ZnO-2 composite indicates that the addition of graphene is effective in improving the formaldehyde sensing performance of ZnO-based sensors.
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Chen, ZW., Hong, YY., Lin, ZD. et al. Enhanced formaldehyde gas sensing properties of ZnO nanosheets modified with graphene. Electron. Mater. Lett. 13, 270–276 (2017). https://doi.org/10.1007/s13391-017-6245-z
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DOI: https://doi.org/10.1007/s13391-017-6245-z