材料科学
荧光
量子点
纳米尺度
石墨烯
纳米技术
气凝胶
光学
物理
作者
Ana Martín‐Pacheco,Antonio Esaú Del Río Castillo,Cristina Martín,M. Antonia Herrero,Sonia Merino,J.L.G. Fierro,Enrique Dı́ez-Barra,Ester Vázquez
标识
DOI:10.1021/acsami.8b02162
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI