Abstract
Pyrolysis of acetylene over thin films made of CuxFeCoNiMn yields graphene and sheet dimension is found to control by x. Monolayer structure forms at x = 0.5 and sheet size reaches a value as large as 600 m2. Layer number increases as x rises and turbostratic graphite forms at x = 1.5. The x-controlled growth mechanism involves five consecutive steps and each is supported by experimental data.