Publication date: 15th December 2025
Lead-free halides nanomaterials have emerged as sustainable candidates to replace lead halide perovskites; with potential optoelectronic properties, owing to their strong light absorption, tunable band gaps across the visible spectrum, and promising photocatalytic activity. [1]
In this work, we report a modified synthetic route [2] for the preparation of colloidal Cs3Bi2Br9 nanocrystals (NCs) of ca. 15 nm, high crystallinity and a sharp absorption peak at 440 nm. Their photocatalytic activity was evaluated through the degradation of organic dyes as proof of concept under visible-light irradiation. The performance of these colloidal NCs is compared with that NCs supported in a porous silica matrix and discussed accordingly. Notably, irradiation times below 15 minutes were enough to achieve complete degradation of methylene blue and rhodamine, demonstrating excellent recyclability and superior data performance compared with previous reported studies. [3]
We thank Generalitat Valenciana for the financial support of the PROMETEO project (CIPROM/2022/57). We also thank the “Santiago Grisolía” predoctoral fellowship (CIGRIS/2021/094) and the European project Advanced Multidiscipliary Research for Antimicrobial Resistance (AMRAMR Project: 101131231).
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