Photoluminescent carbon colloids prepared by laser fragmentation of carbon from waste coffee grounds. Superficies y Vacio [Internet]. 2024 Sep. 30 [cited 2026 Jul. 26];37:240901. Available from: http://superficiesyvacio.smctsm.org.mx/index.php/SyV/article/view/2024_syv37_1-240901