How to quickly and easily detect indoor pollution has become a concern for the people. Today, the reporter learned from Harbin Institute of Technology that the university has developed a new technology. A test strip can test the gaseous organic pollutants in the living environment. It is reported that this paper is a composite film with graphene as a carrier, and it will change color when indoor pollution is found. Recently, the internationally renowned academic journal "Advanced Functional Materials" published the research results of the research group.
On the afternoon of September 1, the reporter met this "magic" test paper at the Research Center of Micro-Nanotechnology of HIT Foundation. The test paper is blue and is the same size as the pH test paper for measuring pH in daily life. Subsequently, the team member and Ph.D. student Wang Xiaona placed a piece of test paper in the glass bottle. When the test paper encountered a toxic gas in the glass bottle, it immediately turned pink. According to reports, the darker the toxic gas, the darker the color of the test paper becomes.
"It looks like an ordinary test paper, but it has a lot of technology." Wang Xiaona told reporters that it is a graphitic-based litmus paper sensor for color change sensors. Graphene is currently known in the world. The thinnest, but also the hardest, nanomaterials are also hot topics in the world.
Professor Hu Ping, the person in charge of the project said. With people’s growing concerns about health, more and more homes are undergoing indoor environmental testing after renovations. Such inspections are not cheap and it takes a few days. "Whether it can find a convenient, sensitive and cheap test method." The team thought of pH test paper for testing pH, and this new material of graphene can better contact with the indoor environment and detection targets, thereby improving the detection sensitivity. Sex. "Even if there is 0.01% pollution in indoor air, it will be detected..." said Hu Ping.
At present, the test paper made by the research group is a composite film of graphene and polydiacetylene, mainly for the common organic chemical contaminants in the experiment. For indoor decoration pollution, the most common forms of formaldehyde and other pollution, researchers said, as long as the transformation of this graphene composite film reaction material can be. The cost of manufacturing such a film is also very low, and a small piece of test paper requires only a few cents. It is understood that this kind of graphene-based litmus paper type of color-changing sensor is also being developed for the first time in the world. (Reporter Wang Shu)
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