Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 197, Issue -, Pages 66-72Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.02.078
Keywords
Graphene oxide; Layer-by-layer; Self-assembly; Flexible device; Humidity sensor
Funding
- National Natural Science Foundation of China [51205414]
- Promotive Research Foundation for the Excellent Middle-Aged and Youth Scientists of Shandong Province of China [BS2012DX044]
- Science and Technology Development Plan Project of Qingdao [13-1-4-179-jch]
- Fundamental Research Funds for the Central Universities of China [12CX04065A]
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Chemically reduced graphene oxide (RGO)/poly(diallylimethyammonium chloride) (PDDA) nanocomposite film sensor with high-performance humidity properties was reported in this paper. The film sensor was fabricated on flexible polyimide substrate with interdigital microelectrodes structure. By the layer-by-layer nano self-assembly approach, graphene oxide and PDDA were exploited to form hierarchical nanostructure, and then was partially reduced via solution-based chemically reduction for obtaining both conductivity and chemically active defect sites. The effect of hydrobromic acid treatment on the conductivity properties of PDDA/GO film was examined, further verifying the advantage of hydrobromic acid reduction. The humidity sensing properties of the presented nanocomposite film sensor, such as repeatability, hysteresis, stability, response-recovery characteristics, were investigated by exposing to the wide relative humidity range of 11-97% at room temperature. As a result, the sensor exhibited not only excellent sensing behavior to humidity, but also fast response-recovery time and good repeatability, highlighting the unique advantages of layer-by-layer nano self-assembly for film sensors fabrication. As last, the possible humidity sensing mechanism of the proposed sensor was discussed in detail. (C) 2014 Elsevier B.V. All rights reserved.
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