Evaluation of the optical properties for thick films of epoxy-diamond paste blend prepared by the casting method

Diamond paste is used in many various fields due to its distinctive and unique optical properties. In this study, the diamond paste content at different concentrations (0.15, 0.35, 0.55 and 0.75 wt. %) with epoxy resins was used to fabricate the polymer blend. Thick films were prepared of polymer blend by casting method; deposit them on thin plastic substrates. The effects of polymeric blends were studied carefully investigated on the optical properties of the blends through a variation in the concentration of additions of diamond paste. The thick films study results revealed that additive of diamond paste led to a structure improvement of the polymer blend and then improve optical properties. The optical properties of the blends were characterized by a clear effect of the additions on the absorption coefficient of the polymer blends. The optimal value for diamond paste content concentration that maximize the absorption coefficient were x = 0.55 where the absorption coefficient was at this content (4.2 x 10(6) cm(-1)). Also, it has been observed direct transport allowed occurred in thick polymer films and the permissible direct energy gap was 3.1ev - 3.7ev, respectively. (C) 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/)