微波一步法制备氮掺杂碳量子点及其对蛇莓中Cu2+的检测  

Preparation of nitrogen-doped carbon quantum dots by microwave one-step method and detection of Cu2+ in snakesberry

作　　者：孟铁宏[1] 钟婷 姜艳萍[1] 王恒[1] 胡先运[1,2] 赵鸿宾 李春荣[1] MENG Tie-hong;ZHONG Ting;JIANG Yan-ping;WANG Heng;HU Xian-yun;ZHAO Hong-bin;LI Chun-rong(Qiannan Medical College for Nationalities,Duyun 558000,China;The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences,Guiyang 550002,China)

机构地区：[1]黔南民族医学高等专科学校,贵州都匀558000 [2]贵州省中国科学院天然产物化学重点实验室,贵州贵阳550002

出　　处：《化学研究与应用》2019年第10期1732-1738,共7页Chemical Research and Application

基　　金：国家自然科学基金项目(81860317)资助;贵州省自然科学基金项目(黔科合基础[2019]1301)资助;贵州省中医药管理局中医药、民族医药科学技术研究项目(QZYY-2018-99)资助;黔南州科技计划项目(黔南州科合社字[2016]1号,黔南州科合社字[2017]19号,黔南科合工字[2016]12号)资助;黔南民族医学高等专科学校基金项目(QNYZ201706,QNYZ201605,QNYZ201801,QNYZ201807,QNYZ201801,QNYZ201807)资助

摘　　要：以维生素C(Vc)为碳源,尿素为氮源,经微波一步法制备得到一种具有高荧光强度的氮掺杂碳量子点。所合成的氮掺杂碳量子点富含-OH、-NH 2和C=O等基团,平均粒径约为4.1 nm,在365 nm紫外光照射下发射出明亮的蓝色荧光。基于氮掺杂碳量子点能与铜离子相互作用进而建立一种快速检测Cu^2+的方法。当Cu^2+浓度在1~18μmol·L^-1之间,氮掺杂碳量子点的荧光猝灭强度(F/F 0)随Cu^2+浓度的增加而线性下降,检出限(S/N=3)达0.19μmol·L^-1。将该方法应用于蛇莓中痕量铜的荧光检测,加标回收率为100.3%~107.3%之间,RSD在0.23%~1.2%之间。With vitamin(Vc)as carbon source and urea as nitrogen source,a nitrogen doped carbon quantum dots(N-CQDs)with high fluorescence intensity were prepared by microwave one-step method.The N-CQDs were rich in-OH,-NH 2,C=O groups,had an average particle size of about 4.1 nm,and emitted bright blue fluorescence under 365 nm ultraviolet light.A new and rapid detection method for Cu ^2+ was established with N-CQDs.When the concentration of Cu ^2+ ranges from 1 to 18 μmol·L^-1 ,the fluorescent intensity( F/F 0)of N-CQDs decreased linearly with the increase of Cu ^2+ concentration,and the limit of detection( S/N =3)was 0.19 μmol·L^-1 .The method was successfully applied to detect trace copper in snake blackberry,the standard recovery rate was 100.3%~107.3%,and RSD was 0.23%~1.2%.

关 键 词：微波法 氮掺杂碳量子点 铜离子 检测 

分 类 号：O657[理学—分析化学]