A joint research team from Japan and the United States has recently developed a sensitive material that can detect toxic gases with high sensitivity. Using this material and Near Field Communication (NFC) technology, it can allow mobile phones to read toxic gases in the air within seconds. The Japan Material Research Institute recently said that they cooperated with the Massachusetts Institute of Technology to apply a layer of polymer material called a supramolecular polymer on the surface of carbon nanotubes to make them into inductive materials.
According to reports, this sensing material uses the change in the conductivity of carbon nanotubes to detect toxic gas concentrations. Carbon nanotubes are inherently highly conductive materials, but they are poorly conductive when covered with a supramolecular polymer. When exposed to toxic gases, the chemical bonds of the supramolecular polymer will be partially destroyed; and when the surface coating of the supramolecular polymer is destroyed, the conductivity of the carbon nanotubes will greatly increase.
Incorporating this sensing material into a circuit using near-field communication technology becomes a sensor that can detect toxic gases. When operating, just use the mobile phone with near field communication function to “sweep†the sensor and read the toxic gas on the mobile phone within 5 seconds. The detected concentration can be as low as 10ppm (1ppm is 1ppm one).
This sensor is a one-off item, but it is small and portable and has a very low cost. It is expected to be applied to anti-terrorism or safety supervision occasions such as metro toxic gas monitoring.
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