Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 45, Issue 8, Pages 4275-4281Publisher
SPRINGER
DOI: 10.1007/s11664-016-4630-2
Keywords
Humidity sensing; characterization; graphene; nanocomposite
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Funding
- National Natural Science Foundation of China [51407200]
- Science and Technology Plan Project of Shandong Province [2014GSF117035]
- Fundamental Research Funds for the Central Universities of China [15CX05041A]
- Science and Technology Project of Huangdao Zone, Qingdao, China [2014-1-51]
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This paper demonstrates the one-step hydrothermal synthesis of a tin dioxide (SnO2)-decorated reduced graphene oxide (RGO) hybrid nanocomposite, which was drop-casted on a polyimide substrate as a humidity sensor. The as-synthesized hybrid was characterized in terms of its nanostructural, morphological and compositional features by SEM, XRD and nitrogen sorption. The humidity sensing properties of the presented RGO/SnO2 hybrid nanocomposite, such as repeatability, stability, response-recovery characteristics, were investigated by exposing it to a broad humidity range of 11-97% RH at room temperature. As a result, the sensor demonstrated a high sensitivity, a good repeatability, an acceptable linearity, a fast response/recovery characteristic and high long-term stability over a full humidity range measurement, indicating the unique advantages of one-step hydrothermal synthesis for sensor fabrication. The possible and proposed sensing mechanism for the sensor is mainly attributed to a humidity-induced transfer of charge carriers occuring at the interfaces and the swelling effect of RGO.
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