Canary Out, Smartphone In For Gas Detection

By using tiny carbon nanotubes tuned electronically to particular gases, researchers turned smartphones into toxin sensors. Cynthia Graber reports. December 11, 2014 | |

Devices that detect potentially or are out there. But they’re expensive and bulky. Now MIT researchers say they’ve developed a way to get the same detection abilities—with your smartphone.

The research team modified what are called near-field communication tags, or NFC tags. Smartphones with NFC capabilities send out magnetic field pulses. The magnetic field creates an electric current on the tag that the phones pick up. Such systems are typically used to track products or drugs.

For the new application, the scientists added links to the circuit made of carbon nanotubes. Each link responds to one particular gas, by changing how the nanotubes conducts electricity. By sensing the change in electric current on the tag, the smartphone signals that it has detected the gas in question.Wireless gas detection with a smartphone via rf communication]

Such inexpensive tiny tags require no external power. The scientists say their NFC tag system has the potential to be widely used to monitor gases that can affect health, safety and the environment.

—Cynthia Graber

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