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SEM images of h-BN nuclei on Cu after 5 min growth, (a) similar to Figure 3a (Pborazine ≈ 1 × 10–3 mbar) and (b) with 5 × 10–4 mbar air exposure prior to step 3. Air exposure caused an order of magnitude reduction in nucleation density of h-BN on Cu for identical processing conditions. (c) Co-exposure of air (1 × 10–4 mbar) and Pborazine ≈ 1 × 10–3 mbar for 30 min leads to nuclei that are irregular in shape.
