Colorimetric sensor based on self-assembled polydiacetylene/graphene- stacked composite film for vapor-phase volatile organic compounds

Xiaona Wang, Xiuling Sun, Ping An Hu, Jia Zhang, Lifeng Wang, Wei Feng, Shengbin Lei, Bin Yang, Wenwu Cao

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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. Polydiacetylene (PDA)/graphene chemosensors are prepared by the self-assembly of PDA monomers on graphene sheets. The graphene is exploited as a transparent and efficient supporter for the highly ordered PDA monolayer, enabling effective detection of environmentally hazardous volatile organic compounds (VOCs). This colorimetric sensor shows sensitive response to low concentrations of VOCs (∼0.01%), such as tetrahydrofuran, chloroform, dimethylformamide, and methanol.

Original languageEnglish (US)
Pages (from-to)6044-6050
Number of pages7
JournalAdvanced Functional Materials
Volume23
Issue number48
DOIs
StatePublished - Dec 23 2013

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

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