| المؤلفون: |
Martín-Pacheco A; Instituto Regional de Investigación Científica Aplicada (IRICA) , 13071 Ciudad Real , Spain., Del Río Castillo AE; Instituto Regional de Investigación Científica Aplicada (IRICA) , 13071 Ciudad Real , Spain., Martín C; Instituto Regional de Investigación Científica Aplicada (IRICA) , 13071 Ciudad Real , Spain., Herrero MA; Instituto Regional de Investigación Científica Aplicada (IRICA) , 13071 Ciudad Real , Spain.; Departamento de Química Orgánica, Facultad de Ciencias y Tecnologías Químicas , Universidad de Castilla-La Mancha (UCLM) , 13071 Ciudad Real , Spain., Merino S; Instituto Regional de Investigación Científica Aplicada (IRICA) , 13071 Ciudad Real , Spain.; Departamento de Química Orgánica, Facultad de Ciencias y Tecnologías Químicas , Universidad de Castilla-La Mancha (UCLM) , 13071 Ciudad Real , Spain., García Fierro JL; Instituto de Catálisis y Petroleoquímica, CSIC , 28049 Madrid , Spain., Díez-Barra E; Instituto Regional de Investigación Científica Aplicada (IRICA) , 13071 Ciudad Real , Spain.; Departamento de Química Orgánica, Facultad de Ciencias y Tecnologías Químicas , Universidad de Castilla-La Mancha (UCLM) , 13071 Ciudad Real , Spain., Vázquez E; Instituto Regional de Investigación Científica Aplicada (IRICA) , 13071 Ciudad Real , Spain.; Departamento de Química Orgánica, Facultad de Ciencias y Tecnologías Químicas , Universidad de Castilla-La Mancha (UCLM) , 13071 Ciudad Real , Spain. |
| مستخلص: |
Fluorescence based on quantum confinement is a property restricted to the nanoscopic range. The incorporation of nanoparticles in a three-dimensional polymeric network could afford macroscopic scaffolds that show nanoscopic properties. Moreover, if these scaffolds are based on strong bonds, the stability of the resulting materials can be preserved, thus enhancing their final applications. We report for the first time the preparation of a graphene quantum dot (GQD) composite based on a cationic covalent network. This new material has unusual features: (i) the final composite remains stable after several swelling-deswelling cycles, thus demonstrating strong interactions between GQDs and the polymeric material, and therefore it could be used as a portable system. (ii) Fluorescence emission in the composite and in solution is quasi-independent to the excitation wavelength. (iii) However, and in contrast to the behavior observed in GQD solutions, the fluorescence of the composite remains unaltered over a wide pH range and in the presence of different ions commonly found in tap water. (iv) Fluorescence quenching is only observed as a consequence of molecules that bear aromatic systems, and this could be applied to the preparation of in situ water sensors. |
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