New graphene-based nano-roll sensor can mimic dog nose gas detection
Recently, Chinese researchers published a report in the latest issue of the American Chemical Society·Nano magazine that they have developed high-quality graphene-based nano-rolls that mimic the nose-nosed olfactory function.
Graphene is a single crystal with a honeycomb two-dimensional monatomic layer, which is an essential part of the carbon allotrope. In theory, graphene can be considered as an infinitely large aromatic molecule with many excellent properties. The gas sensor is a device that integrates gas-sensitive materials. It adsorbs gas molecules by sensitive materials, which leads to changes in electrical properties, and finally obtains a functional relationship between changes in gas concentration and changes in electrical properties.
As a new nanomaterial, graphene has been fully developed on gas sensors in recent years. Recent studies have shown that it has features such as low operating temperature, low power consumption, and high sensitivity. The main principle of the graphene sensor is that graphene is similar to the olfactory and olfactory receiving nerves, and gas molecules are adsorbed on the surface of the graphene, thereby inducing the change of the graphene conductance.
In 2007, the Novoselov team at the University of Manchester produced graphene-based single-molecule gas sensors for the first time. Afterwards, Novoselov's work made many scientists realize the potential of graphene in gas sensing. Many researchers have done more in-depth research on graphene sensors, have a more comprehensive understanding of its mechanism, and improve its performance. .
Chinese researchers have also conducted many research activities on graphene. The researchers were inspired by the dog's nose. There are millions of capillaries in the dog's nose and the surface area is large, which helps the dog to smell a very low concentration of odors. The researchers selected graphene with high surface area and high temperature stability and durability. Base nano roll making gas sensor.
Researchers at institutions such as South China Normal University and Beijing University of Aeronautics and Astronautics used a non-covalent bond supramolecular assembly method to assemble a material called “sodium polystyrene sulfonate†on the surface of graphene sheets, and then passed directional control. The freeze-drying technique causes the graphene-based sheet to curl as it dehydrates, resulting in a plump graphene-based nanoparticle. In addition, the production process of graphene-based nanocoils is simple and efficient, and it is expected to be prepared on a large scale.
The new graphene sensor production process is simple and efficient, and is expected to be prepared on a large scale. The research team plans to use this material in the future to develop gas sensors that can be used to detect toxic gases, as well as medical equipment such as nitric oxide exhalation detectors.
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