2026-04-29T15:59:39Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/110612025-11-15T01:05:34Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

Graphene quantum dot membranes as fluorescent sensing platforms for Cr (VI) detection Carrasco, Pedro Mª García, Ignacio Yate, Luis Tena Zaera, Ramón Cabañero, Germán Grande, Hans J. Ruiz Fernández, Virginia Química analítica Ciencia de materiales Chemistry, Analytic Materials science A simple and versatile method to produce filtration membranes with graphene quantum dots (GQD) and their excellent performance as turn-off fluorescence sensing platforms for Cr (VI) detection in water is presented. Suitably functionalized GQD were immobilized on various types of membranes (nylon, cellulose and glass fiber) and the resulting GQD-modified membranes exhibited the characteristic fluorescence fingerprint of the GQD probes. The membrane fluorescence was quenched by highly toxic Cr (VI) ions due to selective coordination to GQD functional groups. The analytical performance of membranes was comparable to that of dispersed GQD fluorescent probes, displaying a fast and linear response to Cr (VI) concentration in the 1–500 μM range, a low detection limit of 190 nM, high sensitivity, reproducibility and selectivity. Moreover, the membranes can be regenerated by simple washing with deionized water and reused, preserving their good sensing response after several Cr (VI) detection-washing cycles. Membrane sensing performance was very stable after being immersed in water for several days and filtering water through them. Financial support from the Basque Government under the ELKARTEK Program (ACTIMAT project, grant number: KK-2015/00094) and Diputación Foral de Gipuzkoa (BIOGRAF project, grant number: 32/15) is gratefully acknowledged. We wish to thank Dr. Graciela Martinez Paredes for fruitful discussions. 2025-11-14T11:21:21Z 2025-11-14T11:21:21Z 2016-11 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 0008-6223 https://hdl.handle.net/10259/11061 10.1016/j.carbon.2016.08.038 eng Carbon. 2016, V. 109, p. 658-665 https://doi.org/10.1016/j.carbon.2016.08.038 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier