Relative humidity sensor based on MWCNTs-doped polymer microfiber

A relative humidity sensor based on Multi Walled Carbon Nanotubes (MWCNTs) doped with polymer Poly(methyl methacryate) was proposed in this paper. The fabrication technique applied in this paper is a simple direct drawing method that was able to produce a uniform waist microfiber with a minimum diameter of 5 μm with a length of 5 mm. This microfiber was tested on a different range of relative humidity from 45% to 80%. Performance of the fabricated sensor were then analyzed, focusing at the sensitivity of undoped and MWCNTs-doped polymer microfiber. Based on the results, MWCNTs-doped polymer microfiber exhibits higher sensitivities and better resolution compared to undoped polymer microfiber, with sensitivity and resolution obtained at 0.3341 dBm/% and 1.649% respectively. Indeed, the sensor exhibited a high reliability as well as repeatability. Therefore, this study provides a good platform for enhancing the concept of doping nanomaterials like MWCNTs into PMMA for a chemical and biosensor application.