An international joint research team announced that by adding boron atoms to graphene, they have developed a highly sensitive gas sensor. The device can “smell†harmful gases with extremely low concentrations in the air and alert people when they are not aware. The study also helps improve the performance of lithium-ion batteries and field-effect transistors.
The gas sensor made of graphene has high sensitivity, but scientists do not want to stop there, hoping to further improve its performance by incorporating other elements in the graphene.
Morrisio Terence, a professor of physics, chemistry, and materials at Pennsylvania State University, has succeeded in synthesizing high-quality boron-doped graphene sheets that are 1 cm square by replacing the doped elements. In order to prevent the boron compounds from rapidly decomposing after being exposed to the air, they used a chemical vapor deposition system similar to a bubbler in their development.
After the core parts were made, they were sent to a U.S. company at the Honda Research Institute for assembly. The laboratory of the Nobel Prize in physics in 2010 and the scientist of the University of Manchester, Konstantin Novoselov, was responsible for investigating the transmission mechanism of the sensor. In addition, scientists from Belgium, Japan and China also contributed to this study.
Tests have shown that new gas sensors can detect extremely low concentrations of harmful gas molecules, such as nitrogen oxides and parts per million in the air, which are one part per billion in the air, and are more sensitive than graphene alone. The gas sensor should be 27 times higher and 1000 times higher, respectively.
The chief scientist of the Honda Institute responsible for the study, Avidik Haridan, believes that the new method opens up a new way to create ultra-high sensitivity gas sensors. In the future, this technology is very likely to exceed the detection limit of one-sixth of the 1000th, which is six orders of magnitude higher in sensitivity than the most advanced gas sensors.
In the future, this kind of sensor is expected to be widely used in scientific experiments and industries. No matter whether it is poisonous and harmful gases, exhaust gas that exceeds the standards, or nitrogen oxides in air pollution, it will appear in its original form one by one. The researchers said that in addition to detecting toxic and flammable gases in vitro, this boron-doped graphene can theoretically help rebuild lithium-ion batteries and field-effect transistors.
Related papers were published in the "United States National Academy of Sciences" published on November 2. (Reporter Wang Xiaolong)
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