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The Internet of Things disposable paper gas sensor is available

Date:2020-12-23 15:00:36

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What is a gas sensor? Gas sensors are also called gas detectors, which are electronic devices that detect and identify different types of gases. They are usually used to detect toxic or explosive gases and measure gas concentrations. Gas sensors are used in factories and manufacturing facilities to identify gas leaks and detect smoke and carbon monoxide in houses. However, gas sensors vary greatly in size (portable and fixed), range, and sensing capabilities. They are usually part of large embedded systems (such as hazardous materials and security systems) and are usually connected to audible alarms or interfaces. Because gas sensors constantly interact with air and other gases, they must be calibrated more frequently than many other types of sensors.
 
However, not long ago, according to foreign media reports, researchers at Osaka University developed a disposable paper gas sensor. According to reports, this gas sensor solves supply chain problems, such as the cost and sustainability of raw materials used, and equipment Robustness and consistency, as well as its disposability and environmental impact.
 
This gas sensor is a paper molecular sensor device, which is composed of a wood-derived cellulose nanofiber paper substrate, a zinc oxide nanowire sensor and a pencil-shaped graphite electrode. The nanowires that make this gas sensor are very thin, and these nanowires are backed by biodegradable cellulose nanofibers and have graphite electrodes that can be drawn on them with a pencil.
 
When nitrogen dioxide molecules are present around the gas sensor, they will adsorb to the surface of the nanowire, and as the gas molecules affect the electrons that transport current between the electrodes, the resistance will increase. For a higher concentration of gas, the resistance increase is greater. This gas sensor is used to detect NO2 gas (an important part of many industrial processes), and its performance is comparable to available electrodes.

Hirotaka Koga, a researcher at Osaka University, explained: “Our design lays a lot of foundation for the large-scale provision of economic and environmentally friendly molecular gas sensing. Zinc oxide nanowires provide a very large surface area for gas molecules to attach, and cellulose paper The bracket is sturdy and durable, and can be cut to a small size (just a few millimeters) with ordinary scissors. These gas sensors are prepared through a simple two-step process, so they are suitable for widespread use."
Associate Professor Koga said: "We hope that the many advantages of our equipment can make a significant contribution, especially in molecular detection. Accurate measurement of gas concentration is of great significance in many fields such as medical care, environmental protection, chemical production, health and safety. "The researchers hope that this simple two-step process can be extended to detect other gas molecules.
 
Disposable gas sensors can not only effectively sense gas molecules, but also have the cut-and-paste usability for one-time use in the future Internet of Things society.