MIT reports some of its researchers have developed a method to produce cheap NFC-based sensors that could tell if a box contains spoiled food - or explosives.
These inexpensive sensors could be widely deployed, making it easier to monitor public spaces or detect food spoilage in warehouses. Using this system, the researchers have demonstrated that they can detect gaseous ammonia, hydrogen peroxide, and cyclohexanone, among other gases.
“The beauty of these sensors is that they are really cheap. You put them up, they sit there, and then you come around and read them. There’s no wiring involved. There’s no power,” says Timothy Swager, the John D. MacArthur Professor of Chemistry at MIT. “You can get quite imaginative as to what you might want to do with a technology like this.”