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Linear humidity response of carbon dots modified molybdenum disulfide

Abstract

Molybdenum disulfide (MoS2) based humidity sensor has been suffered from low sensing sensitivity and long response time. Herein, this problem has been effectively solved by modifying MoS2 nanosheets using carbon dots (CDs) with abundant functional groups via a convenient and facile hydrothermal method. The mechanism for the enhanced humidity response of CDs modified MoS2 is proposed through the characterization of physical and chemical properties of the as-prepared composites. The introduction of CDs is expected to enlarge the adsorption of water molecules by increasing the specific surface area and surface active sites of MoS2 nanosheets. At the same time, a three-dimensional conductive network is jointly established by the chemisorbed water molecules, CDs and MoS2 nanosheets, which ensures continuous transmission of charges in the low humidity environment. As a result, the response performance and the repeatability have been significantly improved in CDs-MoS2 based humidity sensor. The response curve shows an excellent linear property in the range of 15‒80% RH. This work gives potential applications for CDs modified two-dimensional nanomaterials to improve their humidity sensing performance.

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Publication details

The article was received on 19 Oct 2017, accepted on 03 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP07125F
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Linear humidity response of carbon dots modified molybdenum disulfide

    G. He, D. Huang, Z. Yang, Y. Han, J. Hu, N. Hu, Y. Su, Z. Zhou, Y. zhang and Y. Zhang, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP07125F

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