Synthesis and Characterization of Optical Properties of Carbon Quantum Dots (CQD) Based on Mustard Green (Brassica juncea L) Leaf with Urea Addition. Valensi [Internet]. 2023 Dec. 22 [cited 2026 Mar. 13];9(2):253-60. Available from: https://journal.uinjkt.ac.id/valensi/article/view/34164