https://phys.org/news/2018-06-nanotech-sensor-molecular-fingerprints-bar.html

Their system consists of an engineered surface covered with hundreds of tiny sensors called metapixels, which can generate a distinct bar code for every molecule that the surface comes into contact with. These bar codes can be massively analyzed and classified using advanced pattern recognition and sorting technology such as artificial neural networks. This research—which sits at the crossroads of physics, nanotechnology and big data—has been published in Science.

Translating molecules into bar codes