Electronic Tuning of Laser-Scribed Graphite Oxide

 

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Shaun Mumma-Ditzler
Committee: David Coffey, Steve Cartier

Since its discovery in 2004, the search for an inexpensive, scalable production method of high-quality graphene has proven elusive. The superior electrical, mechanical, and thermal properties of this carbon allotrope paired with its potential applications to semiconductors, structural materials, and energy storage devices has made the efficacy of such a process highly desirable among materials scientists. Here, a Lightscribe-enabled optical disk drive is used to pattern conductive graphene-containing domains directly onto insulating graphite oxide (GO) films, providing a single step method for the production of laser-scribed graphene (LSG) from GO. Several parameters of this fabrication method are varied and their effects on the electrical and structural properties of GO are measured. We report that control over the concentration of GO, the number of exposures to the laser irradiation process, and bending of the LSG films allow tuning of the electrical conductivity of graphene over several orders of magnitude. Optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), are used to characterize the chemical and structural properties of the GO and LSG films.