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The critical role of hydroxyl groups in water vapor sensing of graphene oxide

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Abstract

Excellent adsorption of water vapor on the surface of graphene oxide (GO), which contains several inherited functional groups, leads to the development of improved humidity monitoring systems that can urgently meet the high industrial demand. In this study, we fabricated a GO-based humidity sensor and investigated the influence of hydroxyl group concentration on its performance. The sensor exhibited excellent humidity sensing performance in terms of sensitivity (sensor response ∼40 for 90% RH), selectivity, stability (both long-term and short-term) and reaction time (τres = 8.5 s and τrec = 13 s). Additionally, this sensor does not require external power consumption for heating; thus, the aforementioned performance (recorded at room temperature) with an applied voltage of 0.1 V can significantly reduce the power/energy consumption to about ∼1.314 × 10−4 kW h per year. In the future, this type of sensor can be integrated into smart humidity monitoring systems to not only monitor but also control the humidity levels on a specific application area. Based on complementary characterization techniques, such as XRD, AFM, Raman and electrical measurement, here, we propose a physical-chemical sensing model to elucidate the aforementioned sensor characteristics.

Graphical abstract: The critical role of hydroxyl groups in water vapor sensing of graphene oxide

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Publication details

The article was received on 07 Aug 2018, accepted on 21 Oct 2018 and first published on 26 Oct 2018


Article type: Paper
DOI: 10.1039/C8NA00135A
Citation: Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    The critical role of hydroxyl groups in water vapor sensing of graphene oxide

    Q. Fatima, A. A. Haidry, Z. Yao, Y. He, Z. Li, L. Sun and L. Xie, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C8NA00135A

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