Wireless ZnO nanowires QCM ammonia sensor system based on zigbee protocol

In this paper, we present a zigbee wireless ammonia sensor system which based on quartz crystal microbalance (QCM) coated with ZnO nanowires as sensing element. This system concludes two parts: one is the base station which is constructed with zigbee coordinator linked computer, the other is called the sensor transmitter module which is zigbee coordinator linked ZnO-nanowires-modified QCM sensor. We use star network of zigbee protocol to construct ammonia wireless sensing system. Experimental results indicate that the wireless sensing system has quite good stability and reproducibility. The interaction distance between the computer and RFD can be as far as 100 m in a buliding. The proposed system is potential to construct the low-cost, real-time online wireless gas sensor system, which can be used to monitor the pollutants in the family and the harsh environment.