Dielectric behavior of graphene oxide powder when washed

In the recent years, graphene studies have increased rapidly. Graphene oxide (GO), which is an intermediate product to form graphene, is insulating and it should be thermally reduced to be electrically conductive. In this work, we have described an attempt to change the insulating properties of GO by changing their pH. GO powder has been synthesized and modified to maintain pH=3 by wash process. Microstructure and dielectric performance of GO were investigated. Using dielectric spectroscopy, a saturated value of the conductivity around 10^-5 S/cm was observed. This saturation value was to remain unchanged for applied excitation voltages from 0.1 to 3V. However, performing the dielectric-response measurement under vacuum has unraveled the dominant role of moisture uptake on the electrical conductivity.