RT info:eu-repo/semantics/article
T1 Enhanced photostability and sensing performance of graphene quantum dots encapsulated in electrospun polyacrylonitrile nanofibrous filtering membranes
A1 Ruiz Fernández, Virginia
A1 Pérez-Marquez, Ana
A1 Maudes, Jon
A1 Grande, Hans J.
A1 Murillo, Nieves
K1 Graphene quantum dots
K1 Nanofibers
K1 Membranes
K1 Electrospinning
K1 Fluorescence sensor
K1 Chlorine detection
K1 Química analítica
K1 Chemistry, Analytic
K1 Ciencia de materiales
K1 Materials science
AB 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.
PB Elsevier
SN 0925-4005
YR 2018
FD 2018-06
LK https://hdl.handle.net/10259/11065
UL https://hdl.handle.net/10259/11065
LA eng
NO 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.
DS Repositorio Institucional de la Universidad de Burgos
RD 22-abr-2026