Aerosols with nanobots will save our world?

The Massachusetts Institute of Technology has developed a technology that brings fantastic ideas about microscopic helper robots to life. It's a spray that contains nanobots, passive automatic sensors tuned to recognize specific kinds of threats. It is enough to spray an aerosol in a dangerous place and read the signal to draw conclusions.

The nanobot consists of a substrate and an active part. The first is a colloid, an insoluble particle or stable molecule. It is too small and light, therefore, due to collisions between themselves and the movement of the atmosphere, a suspension of such particles does not have time to fall to the ground under the influence of gravity, but soars in the air for a long time. If you spray at the beginning of the pipe and blow air through the fan, it will fly through it, collecting information.

The active part of the nanobot is represented by a thin, two-dimensional, like graphene, fragment of a nanosized substance. It is sensitive to a specific compound, such as ammonia, after a chemical reaction with it, it dramatically improves its electrical conductivity. A simple photodiode is attached to this material, which generates an electric current when light hits it. When a nanobot stumbles upon a placer of ammonia, its properties change, a stream of electrons jumps through the system, which is recorded by a memory device. Disposable sensor.

Without a colloid base, nanobots will not fly anywhere, but in conjunction with it, they can be passed through pipes and through vessels in the human body. All that remains is to catch it at the exit, at least with the help of a piece of gauze, and then count the number of triggered nanobots-sensors. And to draw a conclusion about the presence of specific substances in the object under study, without the need to penetrate into it. How much it will simplify and secure the diagnosis of everything and everything, one can only dream of!