Nano Structured Gas Sensing Device and Its Application in Underground Mines

Nano gas sensing technology finds its importance where gas sensors used for detecting the toxic gases have been fabricated and modified gradually to enhance its sensitivity and selectivity. Timely and precise monitoring of flammable and hazardous gases inside the mines can aid preventing accidents. Previously Graphene mono-layer has been used as sensing material along with addition of Gold nano-particles on its surface as a sensor device. Various wired and wireless communication with the sensor nodes like Zigbee protocol, IBM Bluemix have been established in recent past and implemented with Internet of Things (IoT)but with limitations. In this paper fabrication of Au based TiO₂, CuO, ZnO, WO₃ resistive type gas sensors array using sol gel method is proposed for better conduction and Node MCU(ESP8266)is employed as a Wireless Fidelity (WiFi)module in this study which when implemented using Message Queuing Telemetry Transport (MQTT)protocol ensures better efficiency and speed. With increased sensitivity, selectivity and better efficiency the paper aims in resulting a better mine hazard management system.