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Resistive room temperature LPG sensor based on a graphene/CdO nanocomposite

Abstract

The authors decribe an ultra-sensitive, room temperature, flexible transparent LPG sensor based on the use of a CdO/graphene nanocomposite. The graphene prevents the accumulation of CdO, enhances the surface area, and acts as a gas sensing material. FESEM images show a uniform decoration of CdO nanoparticles on graphene. The CdO/graphene composite was deposited as a film on interdigitated electrodes (IDEs) which then were used for chemiresistive sensing of liquid petroleum gas (LPG) by using a four probe technique. A Resistivity decreases significantly upon exposure to a LPG. The electrical resistance measurement at a constant bias voltage of 0.5 V. The sensor of type CdO/graphene (1 wt.%) exhibits a sensitivity of 600 ppm of LPG at 27 °C. It is a highly selective, stable and sensitive to low concentration of LPG even at room temperature.

The gas sensing properties of CdO/graphene nanocomposite with different weight percentages were studied using chemiresistive technique.

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Acknowledgments

The author (KVR) is thankful to Science and Engineering Research Board (SERB) - Department of Science and Technology (DST), Government of India, [Project No. SB/EMEQ-183/2013] for the generous financial support.

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Correspondence to Kalagadda Venkateswara Rao.

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Goutham, S., Jayarambabu, N., Sandeep, C. et al. Resistive room temperature LPG sensor based on a graphene/CdO nanocomposite. Microchim Acta 186, 62 (2019). https://doi.org/10.1007/s00604-018-3170-2

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  • DOI: https://doi.org/10.1007/s00604-018-3170-2

Keywords

  • Liquefied petroleum gas
  • Graphene
  • CdO
  • Gas sensor
  • Flexible