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Design and fabrication of CoS2/graphene hybrid composite film sensor for NO2 gas-sensing performance

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Abstract

Since there is a wide variety of 2D and nanostructured metal sulfide materials with easily tunable electrical, optical, physical, and chemical properties, they hold great promise for the development of numerous gas-sensing applications. These applications are particularly attractive for gas sensing in environmental monitoring and breath analysis. In this paper, researchers describe a unique approach for making CoS2/graphene nanocomposites using the chemical vapor deposition (CVD) technique. In comparison to other gas sensors based on transition-metal dichalcogenide materials, the proposed device offers the fastest response time for sensing NO2 gas. Using a heterojunction device in chemiresistive mode, we study the gas-sensing response at varying levels of NO2. The NO2 gas sensor device made from the CoS2/G composite showed a maximum sensitivity of 6.11 for 50 ppm at the optimal temperature (100 oC), in comparison to the pure CoS2 (2.1). The stability of the CoS2/G composite-based sensor device was further tested by measuring its response to varying concentrations of NO2 gas. It was also discovered that gas sensors based on CoS2 and CoS2/G had high levels of selectivity and reproducibility. Sensing mechanism study for the CoS2/G composite attributes the greater sensitivity of the sensing device to the heterostructure between graphene and CoS2.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Authors and Affiliations

  1. Department of Electronics, PSG College of Arts & Science, Civil Aerodrome Post, Coimbatore, Tamilnadu, 641 014, India

    R. Sakthivel

  2. Department of Chemistry, Hindusthan College of Arts and Science, Hindusthan Gardens(Behind Nava India), Avinashi Road, Coimbatore, Tamilnadu, 641 028, India

    A. Geetha

  3. Department of Electronics and Communication Systems, VLB Janakiammal College of Arts and Science, Kovaipudur, Coimbatore, Tamilnadu, 641 042, India

    J. Dineshkumar

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RS and JD, study conceptualization and writing (original draft). AG funding this manuscript.

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Sakthivel, R., Geetha, A. & Dineshkumar, J. Design and fabrication of CoS2/graphene hybrid composite film sensor for NO2 gas-sensing performance. J Mater Sci: Mater Electron 34, 1495 (2023). https://doi.org/10.1007/s10854-023-10807-x

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