Abstract
Two types of deposit, a continuous graphitic film and “nodular” graphitic clusters, have been grown on pure iron foils that have received different surface pretreatments. It is shown that both morphologies occur by a solution/precipitation mechanism. A tentative mechanism is proposed for the growth of the nodular clusters based on the availability of isolated metal particles on the surface. The effect of pretreatment conditions on the rate of carbon solution in the temperature range 700–900°C is reported and it is shown that the maximum rate is achieved, reproducibly, for foils up to 50 μm thickness, after treatment in hydrogen for 3 hr and annealing in vacuum (5 × 10 −8 Torr) for 16 hr at 990°C. Deposition is preceded by an induction period which is related to the rate of carbon dissolution, and is influenced by the presence of surface oxide and dissolved impurities.
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