(566g) Laser Induced Graphene Conductive Films

In this work, we developed a process that starts with raw coal and ends with high quality, transparent, patterned electronic circuits. Coal was treated to remove toxic components while isolating carbon materials that were refined into graphene and graphene oxide powders and films. TEM, XRD and Raman spectroscopy were performed on powders treated over a large thermal range (200 - 2500C). Transparent films were then formed via an ultrasonic spray system and characterized for optical transmission across a spectral range from the UV to the NIR. Thin films of graphene oxide were selectively patterned using a high-power laser to transform the material into highly conductive channels while a high resolution 2D Raman spectral map was taken in situ. Correlations between electrical and optical properties were obtained from conductivity measurements. The carbon-derived materials were slightly less transmissive than ITO in the UV but outperformed it in the NIR while having similar conductivities.