3 years ago

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

Solleti Goutham, Naradala Jayarambabu, Chinta Sandeep, Kishor Kumar Sadasivuni, Devarai Santhosh Kumar, Kalagadda Venkateswara Rao

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.

Graphical abstract

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

Publisher URL: https://link.springer.com/article/10.1007/s00604-018-3170-2

DOI: 10.1007/s00604-018-3170-2

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