Abstract
The design and development of composite thin films of polymethylmethacrylate (PMMA)with multiwalled carbon nanotubes (CNTs) and surface-modified multiwalledcarbon nanotubes (f-CNTs) for gas-sensing applications are presented in thispaper. The responses of these composites for different organic vapors wereevaluated by monitoring the change in the resistance of thin films of compositewhen exposed to gases like dichloromethane, chloroform, acetone, methanol, ethylacetate, toluene and hexane. It was observed that the f-CNT/PMMA compositeshowed a higher response. There was an increase in resistance of the order of102–103, due to surface modification, when exposed to dichloromethane, chloroform and acetone.The sensing mechanism is explained on the basis of volume expansion and polar interactionof various vapors on the CNT surface.
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