Exemplary methods of semiconductor processing may include delivering a carbon-containing precursor and a hydrogen-containing precursor to a processing region of a semiconductor processing chamber. The methods may include generating a plasma of the carbon-containing precursor and the hydrogen-containing precursor within the processing region of the semiconductor processing chamber. The methods may include forming a layer of graphene on a substrate positioned within the processing region of the semiconductor processing chamber. The substrate may be maintained at a temperature below or about 600° C. The methods may include halting flow of the carbon-containing precursor while maintaining the plasma with the hydrogen-containing precursor.