“…Mixed or composite oxides have been explored for a lot of other applications such as electrocatalysts for fuel cells (Garino, et al, 2016), as an electron transporting layer in perovskite solar cells (Mahmood et al, 2015), photocatalyst for hydrogen productions (Sinatra et al, 2015). Many kinds of research have been carried out on properties and applications of SnO2-CuO/Cu: SnO2 composite oxides in recent times such as ferromagnetic properties (Akbar et al, 2020), optical and dielectric properties (Jahnavi et al, 2020), photoluminescence (Nachiar and Muthukumaran, 2019), electronic and optical properties (Shao and Zhang, 2019), electron dosimetric properties (Bhadane et al, 2019), and gas sensing behaviour (Choi et al, 2013;Somjaijaroen et al 2019). However, the effects of CuO on optical and dielectric properties of SnO2 have not been comprehensively investigated.…”