Development of IoT Based n-ZnO/p-rGO Nanohybrid H₂ Sensor Node

An integrated hydrogen detection node was developed using the n-rGO and p-ZnO combining nanohybrid sensor. The hydrogen detecting performance of this integrated system displayed a decent linear relationship among the detecting signal and hydrogen concentrations in air, for a wide range of hydrogen concentrations from 100 ppm to 10,000 ppm (1 % vol.). This ingratiated sensing node was IoT platform based and is connected in the near of the gas measurement setup and the response for set threshold H2 gas in air of 100 ppm, 500 ppm, 1000 ppm, 5000 ppm and 10000 ppm was tested for 1 hours. Upon the detection of a discernible amount of hydrogen, the system will “wake” from an idle state to create a wireless data communication link (using IoT) to relay the detection of hydrogen to a central monitoring station (i.e. laptop, desktop, tablet or smart phone). The hydrogen detecting node was created with two operating modes in mind. In the first mode, considerable amounts of hydrogen would be detected and a central monitoring person would be notified if hydrogen was found above a predetermined threshold in order to track the amount of hydrogen present, actual hydrogen concentrations as low as 100 ppm are sent to the receiver in the second mode of operation.