Highly Sensitive and Selective Recognition of Chromium Ion by Carbon Dots Derived From Dexamethasone Hybrided With Ag/Au NPs
Sofia Quintana Gamboa, Jessica Marlene Muro Hidalgo, Iván J. Bazany‐Rodríguez, Iván A. Reyes‐Domínguez, Pandiyan ThangarasuABSTRACT
Water resources, vital to life, are increasingly contaminated by organic and inorganic residues, with chromium particularly concerning due to its solubility and mobility. Thus, in this work, an optical sensor for the in situ detection of trivalent chromium ions in water is presented using CQDs derived from dexamethasone/ethylenediamine decorated with Ag/Au nanoparticles (CQDs@Ag/Au). The composite nanomaterial was characterized by methods such as FTIR, XRD, SEM, and TEM. The addition of Cr(III) to CQDs@Ag/Au NPs significantly enhances fluorescence intensity without interference from other metal ions, indicating selective detection at 418 nm. The interaction ratio is 1:2 (CQDs@Ag/Au‐Cr 3+ ), and the limit of detection for Cr(III) is 1.3 µM. This system can effectively detect Cr(III) in living yeast cells without altering their morphology or state, making it suitable for biological applications. Additionally, CQDs@Ag/Au NPs effectively detected the Cr(III) ion in a real sample of mining waste.