摘要
以菠菜粉为碳源,通过微波法一步制备了水溶性红光碳点(R-CDs),并研究了其光学性能、结构特征及荧光调控机理.结果表明,R-CDs具有均匀的粒径分布(3.62 nm)、长波长红光发射(648 nm)及窄半峰宽(30 nm),其荧光红移源于羟基与石墨氮的协同作用.基于R-CDs构建的荧光探针可实现Pb^(2+)的高选择性检测,线性范围为0~40 nmol/L,检测限为4.2 nmol/L(R^(2)=0.990).研究表明,Pb^(2+)与R-CDs之间的相互作用主要由动态猝灭机制主导.本研究为绿色合成红光碳点及其在重金属检测中的应用提供了新策略.
In this study,water-soluble red carbon dots(R-CDs)were successfully synthesized via a microwaveassisted method using spinach powder as the carbon precursor.The optical properties,structural characteristics,and fluorescence regulation mechanisms of R-CDs were investigated.The results demonstrated that R-CDs exhibit uniform particle size distribution(3.62 nm),long-wavelength red light emission(648 nm),and a narrow full width at half maxima(FWHM)(30 nm).The observed fluorescence redshift is attributed to the synergistic interaction between hydroxyl groups and graphitic-nitrogen.A fluorescent probe based on R-CDs was developed for highly selective detection of Pb^(2+)ions,with a linear response range of 0—40 nmol/L and a detection limit of 4.2 nmol/L(R^(2)=0.990).Further studies revealed that the interaction between Pb^(2+)and R-CDs is primarily governed by a dynamic quenching mechanism.This work provides a novel and environmentally friendly approach for the synthesis of red carbon dots and their application in heavy metal ion sensing.
作者
江霆杰
曹珏然
姚胜峰
宋健
李娜
陈永颖
李唯
张浩然
雷炳富
JIANG Tingjie;CAO Jueran;YAO Shengfeng;SONG Jian;LI Na;CHEN Yongying;LI Wei;ZHANG Haoran;LEI Bingfu(College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China;Zhejiang Biomass Solution Co.,Ltd.,Huzhou 313000,China;Guangdong Dahai Biotechnology Co.,Ltd.,Shenzhen 518105,China)
出处
《高等学校化学学报》
北大核心
2025年第6期154-161,共8页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:12274144,22361132525)
广东省自然科学基金(批准号:2022A1515010229,2022A1515012448)资助.
关键词
碳点
红色荧光
铅离子
荧光探针
Carbon dot
Red fluorescence
Lead ion
Fluorescent probe
