Investigating the Impact of Substrate-to-Nozzle Distance on the Microstructure and Optical Properties of CuO Thin Films Deposited by Thermochemical Spray Technique: Investigating the Impact of Substrate-to-Nozzle Distance on the Microstructure . RSCI. 2026;35(1):108-118. doi:10.33899/rsci.v35i1.61997