荧光碳点的制备及银离子辅助的点亮型识别青霉胺  

Fluorescent Carbon Dots:Synthesis and Ag+Assisted Turn⁃On Recognition of D⁃Penicillamine

作　　者：李玲芳 王琦 LI Ling-Fang;WANG Qi(Chemistry&Chemical Engineering Department,Taiyuan Institute of Technology,Taiyuan 030008,China)

机构地区：[1]太原工业学院化学与化工系,太原030008

出　　处：《无机化学学报》2020年第11期2055-2062,共8页Chinese Journal of Inorganic Chemistry

基　　金：山西省高等学校科技创新项目(No.2019L0918);山西省应用基础研究计划项目(No.201901D211454)资助。

摘　　要：以半胱氨酸为原料,通过一步热解法制备了荧光碳点(CDs),并采用透射电镜(TEM)、动态光散射(DLS)、X射线能谱分析(XPS)、紫外可见吸收光谱(UV⁃Vis)和荧光光谱(FL)对其进行了表征。结果表明该碳点平均尺寸为3.12 nm,且表现出了良好的荧光特性。银离子能够与碳点结合进而通过光诱导的电子转移有效猝灭碳点的荧光。青霉胺得益于其与重金属离子的配位作用,能够与银离子结合使得后者离开碳点表面从而实现荧光恢复。基于此,我们建立了银离子辅助的碳点荧光点亮型识别青霉胺的新方法。该方法的线性范围为8~500μmol·L-1,检出限为5.62μmol·L-1。该荧光体系用于尿液样品测定,回收率在97.17%~102.05%范围内。Carbon nanodots(CDs)were prepared through a one⁃step pyrolysis procedure using cysteine as precur⁃sor.The as⁃prepared nanomaterials were characterized by transmission electron microscope(TEM),dynamic light scattering(DLS),X⁃ray photoelectron spectroscopy(XPS),ultraviolet⁃visible absorption spectrum(UV⁃Vis)and fluo⁃rescence spectrum(FL).It was turned out that the average size of as⁃prepared CDs was 3.12 nm and they showed good fluorescence property.Silver ions can bind to the CDs and effectively quench the fluorescence through photo⁃induced electron transfer(PET).Further,benefitting from its coordination with heavy metal ions,penicillamine com⁃bines with Ag+and makes the latter leave the surface of the carbon dots to achieve fluorescence recovery.Based on this,an Ag+assisted CDs fluorescent turn⁃on probe was established to recognize penicillamine.The linear range of this method was 8~500μmol·L-1 with a detection limit of 5.62μmol·L-1.The penicillamine content in urine sample was detected and the recovery was in the range of 97.17%~102.05%.

关 键 词：碳点 银离子 荧光点亮型 青霉胺 

分 类 号：O613.7[理学—无机化学] O614.122[理学—化学]