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    Combining the Converse Humidity/Resistance Response Behaviors of RGO Films for Flexible Logic Devices

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    Type
    Article
    Authors
    Tai, Yanlong cc
    Bera, Tushar Kanti
    Lubineau, Gilles cc
    Yang, Zhen-Guo
    KAUST Department
    Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/623073
    
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    Abstract
    Carbon nanomaterials have excellent humidity sensing performance. Here, we demonstrate that reduced-graphene-oxide- (rGO) based conductive films with different thermal reduction times have gradient and invertible humidity/electrical resistance responses: rGO films (< 11 h, negative response, regarded as a signal of “0”), rGO films (around 11-13 h, balance point) and rGO films (> 13 h, negative response, regarded as a signal of “1”). We propose a new mechanism that describes a “scale”-like model for rGO films to explain these behaviors based on contributions from Ohm-contact resistance and capacitive reactance at interplate junctions, and intrinsic resistances of the nanoplates, respectively. This mechanism is accordingly validated via a series of experiments and electrical impedance spectroscopies, which complement more classical models based on proton conductivity. To explore the practical applications of the converse humidity/resistance responses, three simple flexible logic devices were developed, i) a rGO pattern for humidity-insensitive conductive film, which has the potential to greatly improve the stability of carbon-based electrical device to humidity; ii) a Janus pattern of rGO films for gesture recognition, which is very useful to human/machine interactions; iii) a sandwich pattern of rGO films for 3-dimensional (3D) noncontact sensing, which will be complementary to existing 3D touch technique.
    Citation
    Tai Y, Bera TK, Lubineau G, Yang Z (2017) Combining the converse humidity/resistance response behaviors of rGO films for flexible logic devices. J Mater Chem C. Available: http://dx.doi.org/10.1039/c7tc00686a.
    Sponsors
    We express gratitude to the key discipline fund of Shanghai (B117) for financial support and AKM Industrial Ltd for helpful discussions. This work was also partially supported by Baseline Funding from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Journal of Materials Chemistry C
    DOI
    10.1039/c7tc00686a
    Additional Links
    http://pubs.rsc.org/en/Content/ArticleLanding/2017/TC/C7TC00686A#!divAbstract
    ae974a485f413a2113503eed53cd6c53
    10.1039/c7tc00686a
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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