Preparation Of PVP.BtB Thin Films by Spin Coating Technique and Study the Structural and Optical Properties for Optical Filters Application. cbej [Internet]. 2026 Apr. 5 [cited 2026 Aug. 3];32(135):176-88. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/14619