Factors Affecting Synthesis
Concentration of Graphene Oxide: The first main ingredient for the synthesis of rGO/ZnO composite is Graphene Oxide. As much concentration we take initially, that much amount rGO we get at the end of the process. But much higher amount of Graphene Oxide can leads to incomplete reduction and thus bad quality final product.
Concentration of Zinc Precursor: Second main salt in this synthesis is Zinc Acetate (Or Zinc Nitrate). If concentrate of Zinc Acetate is increased, then amount of reducing agent (i.e. Hydrazine Hydrate) should also be increased. Much higher concentration of Zinc Acetate will lead to bigger particles of Zinc Oxide in the final composite.
Concentration of Hydrazine Hydrate: Hydrazine Hydrate acts as the reducing agent in synthesis method. For the optimum reduction of Graphene Oxide and Zinc Acetate, optimum quantity of Hydrazine Hydrate is properly needed.
Effect of Temperature: Temperature plays an important role in speeding up any reaction. High temperature synthesis give us fine product quality by consuming less time.
Why Reflux: Reflux is a very good technique, when we want to give temperature to the solvents just below their boiling point. In this synthesis method, if we do not use reflux and direct heat the solution for 24 hours. Then all the water will be evaporated within few hours and only solid non-reduced GO will be left in the RB flask.