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Defined microstructure makes some substances are highly sensitive to the presence of air of different chemical compounds, making them excellent candidates for the role of detectors of explosives. Alas, the small size of these substances has a downside: they are extremely difficult to integrate into the detectors, which then become very expensive and fragile to handle. In addition, after the discovery of the title compound has long and carefully cleaned from it for next use.
Devoid of these shortcomings, the new ... The authors managed to create such a technology to produce fragments of foam about the size of a postage stamp - and consist of coherent graphene structures. They are convenient to manipulate, they are flexible, durable, easy to clean - and ten times more sensitive than the detectors used today based on organic polymers.
In principle, the technology is quite simple: scientists have only grown graphene on the surface of the nickel foam, which acts as a ...
In the laboratory, the scientists tested the ability of this ... The effectiveness of the system is impressive. For example, ammonia in quantities of 1,000 units for 5-10 minutes, changed the resistance of the graphene by a third.
To the same effect with modern detectors require ten times more material. Generally, to detect the presence of ammonia using the new ... In addition, unlike many of them, ... Cleaning after use as it is also simple: just attach to the graphene current of 100 mA, and the particles of matter ...
Not the worst performance demonstrates the foam and in tests with nitrogen dioxide, and the authors believe, slightly varying the microstructure can be obtained for the detection of similar materials and other compounds.
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