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a) [ℏω.α (ℏω)]1/2 versus photon energy for a‐C:H films deposited at I) 30 V and II) 600 V; lines represent fitting to Tauc equation. Reproduced with permission.38 Copyright 2002, Elsevier. b) Bandgap energy calculation for an activated carbon using spectrophotometric measurements. Reproduced with permission.53 Copyright 2013, Elsevier.
