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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?
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2 .Devices that detect potentially hazardous gases or airborne environmental pollutants are out there.
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3 .But they're expensive and bulky.
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4 .Now MIT researchers say they've developed a way to get the same detection abilities with your smartphone.
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5 .The research team modified what are called near-field communication tags, or NFC tags.
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6 .Smartphones with NFC capabilities send out magnetic field pulses.
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7 .Magnetic field creates an electric current on the tag that the phones pick up.
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8 .Such systems are typically used to track products or drugs.
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9 .For the new application, the scientists added links to the circuit made of carbon nanotubes.
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10 .Each link responds to one particular gas, by changing how the nanotubes conducts electricity.
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11 .By sensing the change in electric current on the tag, the smartphone signals that it has detected the gas in question.
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12 .The method was tested with ammonia, cyclohexanone and hydrogen peroxide.
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13 .And the tags could sense the substances at levels of a few parts per million.
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14 .The research is in the Proceedings of the National Academy of Sciences.
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15 .Such inexpensive tiny tags require no external power.
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16 .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.
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17 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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