Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 203, Issue -, Pages 263-270Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.06.116
Keywords
Graphene oxide; Nanocomposite film; Humidity sensor; Layer-by-layer self-assembly
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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A ultrahigh performance humidity sensor based on graphene oxide (GO)/poly(diallyldimethylammonium chloride) (PDDA) nanocomposite film was reported in this paper. The multilayered film of GO/PDDA was fabricated on a polyimide substrate using layer-by-layer self-assembly technique. The structures of the selfassembled films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The humidity sensing behaviors of the film sensor were investigated at room temperature over awide range of 11-97% relative humidity. Unprecedented response of up to 265,640% was demonstrated for the presented sensor when exposed to varying relative humidity levels, which is better than that of the best conventional humidity sensor. Furthermore, the presented sensor exhibited ultrafast response and recovery times capable of monitoring human breath. Moreover, the possible humidity sensing mechanism of the proposed sensor was discussed by using complex impedance spectra and bode diagrams. This measurement results observed highlight the layer-by-layer self-assembled graphene oxide/polyelectrolyte film is a candidate material for constructing humidity sensors. (C) 2014 Elsevier B. V. All rights reserved.
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