Surface Adsorbed Reduced Graphene Oxide on Nylon-6 via Vacuum-Assisted Self-Assembly for Chemiresistor Sensing of Trimethylamine

A surface adsorbed reduced graphene oxide (rGO) on nylon-6 was prepared by a facile vacuum-assisted method. Spectroscopic, surface, and thermal characterization of the fabricated film revealed the formation of semi-ordered stacked rGO nanolayers, indicating physical interaction between the rGO and nylon 6 substrate. Electrical conductivity measurement data suggested a percolated system with a conducting network of nanosheets in the composite matrix. A low percolation threshold of 0.48% was observed, which can be attributed to the high conductivity and large surface to volume ratio of rGO. The conductivity of the nanocomposite was affected by the presence of trimethylamine (TMA) vapor, and the variation was dependent on the concentration of TMA in the vapor phase. This behavior proves the potential of the rGO/nylon6 composite as a promising sensing material for TMA.