Ball milling is a process for grinding a material. It involves A slightly inclined or horizontal rotating cylinder that is partially filled with balls,which grind material to the necessary fineness by friction and impact with the tumbling balls. A ball-milling treatment can help to fabricate graphene composites of variety of matrixes.
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Bandgap
A bandgap is an energy range in which electrons cannot exist. A bandgap is required to enable electronic switching. Semiconductor materials like silicon are used in electronics because while it conducts it electrons, it can also act as an insulator–it has a bandgap. Graphene without any alteration does not have a bandgap, making it a pure conductor.