KAJIAN SIFAT OPTIK NANOFIBER REDUCED GRAPHENE OXIDE/POLY (3,4-ETHYLENEDIOXYTRIOPHENE):POLY (STYRENE SULFONATE) (PEDOT:PSS) HASIL ELECTROSPINNING; STUDY ON THE OPTICAL PROPERTIES OF REDUCED GRAPHENE OXIDE/POLY (3,4-ETHYLENEDIOXYTRIOPHENE):POLY (STYRENE SULFONATE) (PEDOT:PSS) ELECTROSPINNING NANOFIBERS

Widianto, Eri, Imam Santoso

2015 | Disertasi | FMIPA

Reduced graphene oxide (rGO) nanofibers have been successfully fabricated with variations of dopant concentration poly (3,4-ethylenedioxytriophene):poly (styrene sulfonate) (PEDOT:PSS) by electrospinning. The rGO nanofibers were prepared initially by synthesizing graphene oxide using Hummer’s method.The result of Raman spectroscopy, UV-Vis spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy showed that graphene oxide has been formed. Morphological structure of rGO/PEDOT:PSS nanofibers was observed by using Scanning Electron Microscope (SEM) with diameters (262.03 ± 25.87) nm and (227.23 ± 27.97) nm for additions PEDOT:PSS 0.2 ml and 0.8 ml, respectively. Study on optical properties rGO/PEDOT:PSS nanofibers was optical absorption and complex refractive index (n and k). It was observed that absorption width peak at 2.9 eV. We report significant changes of complex refractive index with the increasing of PEDOT:PSS. The value of extinction coefficient decreases with the addition PEDOT:PSS due to the new band or further widening of the band gap. Addition of PEDOT:PSS shows the value of n decreases at range 3 to 6.2 eV and increases at range below 3 eV. The decreasing value of k showed that rGO nanofibers more transparent with the addition of PEDOT/PSS, so it is potentially as a transparent and conductive electrode.

Kata Kunci : nanofibers; graphene oxide; PEDOT:PSS; complex refractive index