硝酸辅助合成水溶性绿光碳点及其在pH测量与Fe3+检测中的应用  

Nitric Acid Assisted Synthesis of Water-Soluble Green Fluorescent Carbon Dots for pH Measurement and Fe Ions Detection

作　　者：康亚超 黄园媛 孙化振 郑万里 马献力[1] 蒋东丽[1] KANG Ya-Chao;HUANG Yuan-Yuan;SUN Hua-Zhen;ZHENG Wan-Li;MA Xian-Li;JIANG Dong-Li(Pharmacy College,Guilin Medical University,Guilin,Guangxi 541100,China;College of Materials Science and Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China)

机构地区：[1]桂林医学院药学院,桂林541100 [2]桂林理工大学材料科学与工程学院,桂林541004

出　　处：《无机化学学报》2020年第9期1744-1752,共9页Chinese Journal of Inorganic Chemistry

基　　金：广西自然科学基金重大项目(No.2016GXNSFEA380001);桂林市科学研究与技术开发重点项目(No.20170108-10);桂林医学院博士科研启动项目(No.31304018001)资助。

摘　　要：以柠檬酸、甲酰胺与浓硝酸为原料合成了绿色荧光碳点(CDs),对其物相、形貌及荧光性能进行了表征,并研究了其在离子检测及荧光标记方面的应用。结果表明:所合成的CDs呈现良好的水溶性;当以360~460 nm波长的光激发时,该CDs发出明亮的绿色荧光,并且发射峰的位置不随激发光波长而改变,其量子产率高达44.2%;同时,该绿光CDs对pH敏感,体系pH值在4.5~8.5范围内时,其归一化荧光强度与pH间有较好的线性关系;此外,该绿光CDs对Fe^3+有较好的选择性响应,在0~1 000μmol·L^-1范围内,体系的荧光淬灭效率(I0/I)与Fe^3+浓度有良好的线性关系,检出限为9.8μmol·L^-1。A green fluorescent carbon dots(CDs) was synthesized from citric acid, formamide and concentrated nitric acid. The phase compositions, morphologies and fluorescence properties were characterized. The applications of the as-prepared CDs in ion detection and fluorescence imaging were studied as well. The results show that the as-synthesized CDs presented a good water - solubility and emitted bright green fluorescence with an excitation-independent photoluminescence(PL) behavior when the excitation wavelength ranged from 360 to 460 nm. The quantum yield was as high as 44.2%. Meanwhile, the green fluorescent CDs was pH sensitive and the normalized fluorescence intensity was linearly proportional to the pH values of solutions in a range of 4.5~8.5. Furthermore, the CDs also exhibited excellent selective response to Fe^3+with a good linear relationship between the fluorescence quenching efficiency(I0/I) and the Fe^3+concentration in a range of 0~1 000 μmol·L^-1, and the detection limit was calculated to be 9.8 μmol·L^-1.

关 键 词：绿光碳点 水溶性 荧光材料 铁离子检测 PH响应 

分 类 号：TB34[一般工业技术—材料科学与工程]