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    • Keywords


      Carbon nanotubes; polyethylenimine (PEI); sensor; NO$_2$.

    • Abstract


      Chemical detection of toxic gases, such as greenhouse gases is still very important as a research topic. To design gas sensor detectors based on single-walled carbon nanotubes (SWCNTs) with high sensitivity and selectivity for the toxic environment is a continuous process. The aim is to detect NO$_2$ gas with better sensitivity. In the present work, the thin-film sensor is fabricated on SiO$_2$ substrate and it is functionalized with polyethylenimine (PEI). It has been established that PEI functionalized SWCNTs (F-SWCNTs) show high sensitivity towards strong electron-withdrawing particles. It was found that at room temperature, SWCNTs-PEI functionalized gas sensor exhibited a higher sensitivity of 37.00% as compared with bare SWCNTs gas sensor. The gas sensor has shown the repeatable response for the entire concentration range studied.The sensing properties and the PEI functionalization duration effects on the behaviour of SWCNTs-based gas sensors were demonstrated.

    • Author Affiliations



      1. Department of Nanoengineering, Samara National Research University, Samara 443086, Russia
      2. ISOM, E.T.S.I. Telecommunication, Universidad Politecnica de Madrid, Madrid 28040, Spain
      3. Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (MIPT), Dolgoprudny 141700, Russia
      4. Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia (Central University), New Delhi 110025, India
    • Dates

  • Bulletin of Materials Science | News

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