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In this paper, a ZigBee wireless ethanol vapor sensor system has been presented. This system is based on quartz crystal microbalance (QCM) coated with graphene nanowires as sensing element. This system is a QCM ethanol vapor sensor network, and we use star network to construct it. It consists of two parts: one is the sensor transmitter module witch consist of lots sensor transmitter; the other is a network center. Every sensor transmitter is a ZigBee coordinator linked with grapheme- nanowires-modified QCM ethanol vapor sensor, and it is responsible to acquire information from QCM sensor and transmit information to network center. The network center constructed with ZigBee coordinator also but linked with computer, and it is responsible to processing and controlling. It is indicated form experimental results that the stability, sensitivity and reproducibility of this wireless sensing system are quite good. The proposed system is low-cost and real-time, and it can not only be used to monitor ethanol vapor but also detect the polluted gas in family and harsh environment.

Wireless Graphene Nanowires QCM Ethanol Vapor Sensor Network Based on ZigBee Protocol