氧化石墨烯/罗丹明6G改性滤纸的制备及性能

Preparation and Properties of Graphene Oxide/Rhodamine 6G Modified Filter Paper

关键词:  滤纸  氧化石墨烯  罗丹明6G  铁离子  检测性能

Key Words:filter paper  graphene oxide  rhodamine 6G  iron ion  detection performances

摘要:利用氧化石墨烯（GO）和罗丹明6G-聚乙烯亚胺（R6G-PEI）对滤纸（FP）进行物理改性，制备了纸基传感器FP/GO/R6G-PEI。利用扫描电子显微镜、X-射线衍射仪、伺服材料多功能高低温控制试验机、紫外光谱仪和荧光光谱仪等，对FP/GO/R6G-PEI的形貌、力学性能和传感性能进行表征。结果表明，与FP、FP/GO相比，FP/GO/R6G-PEI的表面平滑度提高，透气度降低，力学性能增大。将FP/GO/R6G-PEI浸泡于Fe³⁺溶液中时，观察到FP/GO/R6G-PEI变为淡粉红色，且荧光强度显著增强，可实现FP/GO/R6G-PEI对水中的Fe³⁺肉眼可见和荧光检测。理想识别单元Structure 3与Fe³⁺的能级差（0.53 eV）小于Structure 3的能极差（3.12 eV），说明Structure 3与Fe³⁺的螯合体系更稳定。

Abstract:The paper-based sensor FP/GO/R6G-PEI was prepared by physically modifying the filter paper （FP） with graphite oxide （GO） and rhodamine 6G-polyethyleneimine （R6G-PEI）. The morphology， mechanical properties， and sensing performances of FP/GO/R6G-PEI were characterized by scanning electron microscope， X-ray diffraction，servo material multi-functional high and low temperature control testing machine， UV-vis spectrometer， and PL spectrometer. Compared with FP and FP/GO， the surface smoothness and mechanical property of FP/GO/R6G-PEI increased， while the air permeability decreased. When FP/GO/R6G-PEI was immersed in Fe³⁺ solution， it was observed that FP/GO/R6G-PEI turned pale pink， and the fluorescence intensity was significantly enhanced， which realized the visual detection and fluorescence detection of FP/GO/R6G-PEI to Fe³⁺ in water. The energy gap between Structure 3 and Fe³⁺ （0.53 eV） was obviously smaller than that of Structure 3 （3.12 eV）， indicating that the chelating system was more stable after the interaction of structure 3 with Fe³⁺.