Colorimetric Sensor Based on Self-Assembled Polydiacetylene/Graphene-Stacked Composite Film for Vapor-Phase Volatile Organic Compounds

Authors

  • Xiaona Wang,

    1. Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China
    2. Department of Material Physics and Chemistry, Harbin Institute of Technology, Harbin, 150080, China
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  • Xiuling Sun,

    1. Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China
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  • Ping An Hu,

    Corresponding author
    1. Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China
    2. Department of Material Physics and Chemistry, Harbin Institute of Technology, Harbin, 150080, China
    • Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China.

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  • Jia Zhang,

    1. Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China
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  • Lifeng Wang,

    1. Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China
    2. Department of Material Physics and Chemistry, Harbin Institute of Technology, Harbin, 150080, China
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  • Wei Feng,

    1. Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China
    2. Department of Material Physics and Chemistry, Harbin Institute of Technology, Harbin, 150080, China
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  • Shengbin Lei,

    1. Key Lab of Microsystem and Microstructure of the Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China
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  • Bin Yang,

    1. Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, 150080, China
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  • Wenwu Cao

    1. Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, 150080, China
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Abstract

A portable litmus-type chemosensor is developed for the effective detection of environmentally hazardous volatile organic compounds (VOCs) using polydiacetylene (PDA) and graphene stacked within a composite film. The graphene is exploited as a transparent and efficient supporter for the highly ordered PDA monolayer. This colorimetric sensor exhibits a sensitive response to low concentrations of VOCs (∼0.01%), including tetrahydrofuran (THF), chloroform (CHCl3), methanol (CH3OH), and dimethylformamide (DMF). The color change that is caused by relatively high concentrations of VOCs can be perceived by the naked eye, and it is noteworthy that a logarithmic relationship is observed between the chromatic response and the VOC concentration in the range of ∼0.01%–10%. The structural conformation changes of the PDA molecules, caused by interactions with VOCs, are directly observed by scanning tunneling microscopy (STM), which reveals the intrinsic mechanism of the chromatic variety at the molecular level.

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