期刊
IEEE SENSORS JOURNAL
卷 21, 期 24, 页码 27290-27297出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3126377
关键词
Charge transport mechanisms; graphene oxide; humidity; metalorganic framework; surface treatment
The study demonstrates an increase in sensitivity and performance of humidity sensors by combining GO with ZIF-8, with ZIF-8 particles dispersed on the GO surface contributing to improved ionic conductivity and sensing capabilities. The enhanced sensitivity of the surface-treated GO is attributed to the proton ion hopping mechanism from low relative humidity values, indicating the superficial origin of the sensing mechanism.
Graphene oxide (GO) is proven to be a very versatile material in sensing devices. As a moisture-sensitive material, it finds a wide variety of applications from biomedical to environmental, which is mainly related to its fast response and low cost. Here a treatment to GO using the metalorganic framework ZIF-8 is applied for the realization and study of humidity sensing. An incremental increase in sensitivity is demonstrated as we move from pure GO to GO blended with ZIF-8 to ZIF-8 dispersed on the GO surface, with two and three order of magnitude change in relative DC current respectively. The particles of ZIF-8 are uniformly dispersed on the GO surface with an average size of 200 nm contributing to ionic conductivity and improving the sensing capabilities. The dynamic analysis reveals that behind the enhanced sensitivity of the surface treated GO lays the fact that, in contrast to GO, the proton ion hopping mechanism kicks in from the lowest relative humidity values and the resistance follows the R similar to f(-1) law throughout the whole relative humidity range, while at the same time it signifies the superficial origin of the sensing mechanism.
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