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MEASUREMENT OF THE ELECTRONIC DENSITY OF STATES OF GRAPHENE OXIDE USING CAPACITIVE PHOTOCURRENT SPECTROSCOPY Tanesh Bansal April 28, 2011 Understanding of the band structure of the new nano materials is essential to have a deeper insight into their optical and electrical properties. Along with the existing techniques used for characterization of nano-materials, it is also important to develop new techniques and methods which can reveal previously unobserved details. This dissertation describes an innovative measurement technique, capacitive photo current spectroscopy (CPS), which is used to probe the density of states (DOS) of graphene, graphene oxide (GO) and reduced graphene oxide (rGO). In contrast to the standard photocurrent measurement technique, CPS technique uses a floating electrode (electrodes separated by an insulator) configuration. Floating electrode eliminates the existence of any background current, which in turn increases the sensitivity towards photo generated electronlhole pairs revealing new features in the photocurrent spectrum.

Measurement of the electronic density of states of graphene oxide using capacitive photocurrent spectroscopy.