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In recent times, single layer graphene oxide (GO) has been of intense interest for a broad spectrum of applications. Size and surface charge of GO sheets are two key factors in the most of these fields. These structural properties can be tuned by adjusting pH manipulating the content of oxygen-containing groups. Furthermore, the pH value extremely affects on the surface chemistry and functional groups of GO sheets which are crucial in providing a high stable solution and chemical activity of particles. In this study, Graphene oxide is synthesized by improved hummer method and characterized by XRD, AFM, FTIR, DLS and zeta potential. pH value can be tuned trough titration with NaOH and HCl and effect of pH on GO dispersion stability and optical properties is investigated.

The effect of pH on lateral size and surface chemistry of graphene oxide