Gas sensors play an important role in a wide range of both home and industrial applications such as gas leakage detection, air-quality monitoring and breath-analysis. Among the various types of gas sensors, chemiresistors are probably the most promising due to their easy fabrication, low cost, high sensitivity and wide detection range. Gas sensors can complement as an alternative to more sophisticated instruments or systems for various detection purposes.
With the fast development of graphene research, materials with a typical 2D structure are attracting increasing attention, typically including metal dichalcogenides, metal oxides, phosphorene, MXene, boron nitrides, as well as their nanocomposites. These materials can be obtained by typically top-down or bottom-up process. They also bring up a huge opportunity to manipulate diverse composite materials though surface functionalisation or hybridisation.
To be utilised for a sensing layer, the 2D geometry affords enhanced surface adsorption due to its large surface-to-volume ratio. The 2D planar structure also provides a good compatibility with current thin film technology for manufacturing electronic devices. Gas-phase deposition techniques such as atomic layer deposition or chemical vapour deposition also make it possible to study the dependence of the thickness of the sensing layer on the sensor properties and performances.
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Source: Advanced Science News