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Resistive room temperature LPG sensor based on a graphene/CdO nanocomposite
Solleti Goutham1, Naradala Jayarambabu1, Chinta Sandeep2
1Nano Electronics Laboratory, Centre for Nano Science and Technology, JNT University Hyderabad, Kukatpally, Telangana, 500085, India.
Mikrochimica Acta
|January 11, 2019
Summary
This study presents a highly sensitive, room temperature, flexible transparent sensor for liquid petroleum gas (LPG) using a cadmium oxide/graphene nanocomposite. The novel sensor demonstrates excellent selectivity and stability for detecting low LPG concentrations.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Graphene-based nanocomposites offer enhanced surface area and conductivity for gas sensing applications.
- Cadmium oxide (CdO) is a promising semiconductor for gas sensors, but its performance can be limited by nanoparticle aggregation.
Purpose of the Study:
- To develop an ultra-sensitive, room temperature, flexible, and transparent gas sensor for liquid petroleum gas (LPG).
- To investigate the gas sensing properties of a cadmium oxide/graphene (CdO/graphene) nanocomposite.
Main Methods:
- Fabrication of a CdO/graphene nanocomposite with uniform CdO nanoparticle decoration on graphene.
- Deposition of the composite film on interdigitated electrodes (IDEs) for chemiresistive sensing.
- Utilizing a four-probe technique for electrical resistance measurements at a constant bias voltage of 0.5 V.
Main Results:
- The CdO/graphene nanocomposite exhibited a significant decrease in resistivity upon exposure to LPG.
- The sensor demonstrated high sensitivity (600 ppm of LPG) at room temperature (27 °C).
- The material showed excellent selectivity, stability, and sensitivity to low LPG concentrations.
Conclusions:
- The CdO/graphene nanocomposite is a highly effective material for developing ultra-sensitive, room temperature, flexible, and transparent LPG sensors.
- The synergistic effect of graphene and CdO enhances gas sensing performance, preventing aggregation and increasing surface area.
- This technology holds potential for advanced gas detection systems operating under ambient conditions.
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