2026-04-29T16:00:08Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/110652025-11-15T01:05:35Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

Ruiz Fernández, Virginia 858 600 0000-0002-0466-0634 Pérez-Marquez, Ana 26f21043-9976-43b0-9a4c-58f1f085f553 Maudes, Jon aaa46f03-d8d9-4800-bf3c-d320ce17ce44 Grande, Hans J. c8ff9d1e-6b7b-4b80-ac09-068a3faaa23f 600 Murillo, Nieves 6d329c84-d3ca-4069-b59a-d0e9b9224ca8 2025-11-14T13:43:42Z 2025-11-14T13:43:42Z 2018-06 0925-4005 https://hdl.handle.net/10259/11065 10.1016/j.snb.2018.02.081 We report a method to encapsulate graphene quantum dots (GQD) in polyacrylonitrile (PAN) nanofibrous membranes to manufacture robust filtering membranes by electrospinning. GQD-PAN membranes with different nanofiber diameter were prepared tuning the electrospinning parameters, all exhibiting the characteristic fluorescence fingerprint of the GQD probes. The photoluminescence (PL) stability of GQD embedded in the PAN fibers was significantly enhanced with respect to that of water dispersed GQD luminescent probes. The PL of GQD-PAN filtering membranes showed remarkable time stability, both stored dry and immersed in phosphate buffer solutions (PBS), as well as exposed to continuous light irradiation. However, the PL intensity of GQD-PAN membranes was irreversibly quenched by highly oxidant free chlorine solutions. Thus, electrospun GQD-PAN membranes exhibited excellent performance as turn-off fluorescence sensing platforms for free chlorine detection in PBS 0.1 M pH 7. The analytical performance of GQD-PAN membranes was comparable to that of GQD solutions with optimal concentrations, displaying a fast (no need of incubation time) and linear response to chlorine concentration in the 10–600 μM range, a low detection limit of 2 μM, high sensitivity, reproducibility and selectivity. Moreover, the sensing performance of the membranes was very stable after being immersed in PBS for months, outperforming the stability of GQD solutions. Los autores agradecen el apoyo financiero del Gobierno Vasco en el marco del Programa ELKARTEK (proyecto ACTIMAT, subvenciones n.º KK-2015/00094 y KK-2016/00097 ). Asimismo, agradecen al Dr. Álvaro Colina su ayuda con la espectroscopia Raman. application/pdf eng Elsevier Sensors and Actuators B: Chemical. 2018, V. 262, p. 902-912 https://doi.org/10.1016/j.snb.2018.02.081 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Graphene quantum dots Nanofibers Membranes Electrospinning Fluorescence sensor Chlorine detection Química analítica Ciencia de materiales Chemistry, Analytic Materials science Enhanced photostability and sensing performance of graphene quantum dots encapsulated in electrospun polyacrylonitrile nanofibrous filtering membranes info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Sensors and Actuators B: Chemical 262 902 912 THUMBNAIL Ruiz-sabc_20218.pdf.jpg Ruiz-sabc_20218.pdf.jpg IM Thumbnail image/jpeg 4532 https://riubu.ubu.es/bitstream/10259/11065/4/Ruiz-sabc_20218.pdf.jpg 888d965b4ff0960ce9468d111102b75a MD5 4 LICENSE license.txt license.txt text/plain; charset=utf-8 999 https://riubu.ubu.es/bitstream/10259/11065/3/license.txt b295bcbce42e2caabeb0c623d3860c06 MD5 3 CC-LICENSE license_rdf license_rdf application/rdf+xml; charset=utf-8 805 https://riubu.ubu.es/bitstream/10259/11065/2/license_rdf 4460e5956bc1d1639be9ae6146a50347 MD5 2 ORIGINAL Ruiz-sabc_20218.pdf Ruiz-sabc_20218.pdf application/pdf 1476924 https://riubu.ubu.es/bitstream/10259/11065/1/Ruiz-sabc_20218.pdf f17eaa95f32c03a20c4655b5f15e1d65 MD5 1 10259/11065 oai:riubu.ubu.es:10259/11065 2025-11-15 02:05:35.965 Repositorio Institucional de la Universidad de Burgos bubrep@ubu.es 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