Methane Sensors Based on Lithium Doped Porous Materials for Coal Mine Safety Application

Abstract

Two kinds of methane sensors based on lithium-montmorillonite (Li-MMT) or lithium-cyclodextrin (Li-CD) have been developed, and they have been further modified by adding a small amount of carbon nanotubes (CNTs). The sensitivity of the sensors increases linearly with methane content in the concentration range of 50-500 ppm. Other characteristics of the sensors such as response time, gas selectivity, and stability have been investigated as well. The results indicate that all the sensors response quickly, show good sensitivity and selectivity to methane. Li-MMT/CNTs sensor has highest sensitivity towards methane, and Li-CD sensors have certain resistance to dust and humidity, showing great advantages in coal mine safety application.

Combined Mixed Potential Electrochemical Sensors and Artificial Neural Networks for the Quantificationand Identification of Methane in Natural Gas Emissions Monitoring

“…33 Recently, much research has been focused on mixed solid-state gas sensors. [34][35][36][37][38][39][40][41][42][43] Of these, mixed potential electrochemical sensors (MPES) are well suited to natural gas leak detection in that they have been shown to be capable of detecting methane, ammonia and heavier hydrocarbons. 44,45 The sensing mechanism has been described in detail by Muira et.…”

Recent trends in gas sensingviacarbon nanomaterials: outlook and challenges

“…Due to the change in the hole concentration of the CNTs, the sensor showed improved sensitivity (14.48% at 500 ppm CH 4 ). For a further improvement in the sensing performance, Wu et al fabricated methane sensors based on lithium-montmorillonite (Li-MMT) or lithium cyclodextrin (Li-CD), 138 where Li-MMT showed a higher response (∼42% @ 500 ppm CH 4 ).…”