Volatile organic compounds (VOCs) are organic compounds that easily vaporises. Along with carbon, they contain elements such as hydrogen, oxygen, fluorine, chlorine, bromine, sulphur or nitrogen. Many VOCs are hazardous air pollutants, and are health and environmental risks.
A method detecting such gases is through the use of optical sensors, which has several advantages over electronic sensors such as being electromagnetically unsusceptible. 1-dimensional semiconducting metal oxide nanowires have been widely investigated due to their high sensitivity to different compounds, but they are often bogged down by humidity interference, hence requiring operating temperatures above 100oC. Several further studies have shown that hydrophobic, 2-dimensional (2D) reduced Graphene Oxide (rGO) is able to overcome this problem and functions with high sensitivity in high humidity environments, allowing for low temperature use.
In this technology, a novel hydrophilic, 2D Graphene Oxide (GO) based gas sensor, was developed. The GO sensor is able to maintain high sensitivity in highly unfavourable conditions (up to 90% relative humidity, strongly acidic or basic) and outperforms the rGO. This technology also proposes the combined use of rGO and GO in a gas sensor, to provide the ability for distinguishing between tetrahydrofuran (THF) and dichloromethane (MC), in addition to the above benefits.
This technology features:
The technology can be applied, but not limited to the following: