摘要
以柠檬酸和谷氨酸为原料、聚乙二醇(PEG)为分散剂,采用微波法制备掺氮碳量子点(N-CQDs)。研究了不同制备条件对N-CQDs结构和性能的影响,利用透射电镜、紫外可见吸收光谱、荧光光谱以及红外光谱对制备产物进行表征,确定了最佳制备条件:柠檬酸80 mg/mL、谷氨酸16 mg/mL,PEG 80 mg/mL,微波反应功率800 W,反应3.5 min。在该条件下制备的N-CQDs具有尺寸均匀、分散性良好及pH敏感性较好的优点;同时具有激发波长依赖性,最大激发波长为340 nm,发射峰为430 nm。此外,红外光谱研究表明,N-CQDs表面含有丰富的羟基和羰基等官能团,水溶性和生物相容性好,在食品快速检测领域具有良好的应用潜力。
Nitrogen doped carbon quantum dots( N-CQDs) were prepared by microwave reaction method with citric acid and glutamic acid as raw materials,polyethylene glycol( PEG) as dispersant. The transmission electron microscopy,ultraviolet visible absorption spectroscopy,fluorescence spectroscopy and infrared spectroscopy were used to research the influences of different preparation factors on the structure and property of N-CQDs. The optimum conditions are shown as follow: 80 mg/mL citric acid is blended with 16 mg/mL glutamate and 80 mg/mL PEG then microwaved for3. 5 min at 800 W power condition. The N-CQDs prepared in the optimum conditions are size homogeneous,dispersity well and pH sensitive. Meanwhile,they possess excitation wavelength dependence,the maximal excitation wavelength is 340 nm,and the emission peak moves to 430 nm. Moreover,the study of infrared spectroscopy shows that hydroxy,carbonyl and other functional group abound in the surface of N-CQDs,it causes the great water solubility and biocompatibility. Thus,N-CQDs show a significant application potential in rapid detection of food industry.
作者
蒋雪薇
叶菁
许延涛
宁静恒
罗晓明
吕变梅
李赤翎
JIANG Xue-wei;YE Jing;XU Yan-tao;NING Jing-heng;LUO Xiao-ming;LYU Bian-mei;LI Chi-ling(School of Chemical & Biological Engineering,Changsha University of Science & Technology,Changsha 410114,China;Hunan Provincial Engineering Technology Research Center for Condiment Fermentation,Changsha 410600,China;Hunan Provincial Engineering Research Center for Food Processing of Aquatic Biotic Resources,Changsha 410114,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2018年第8期1075-1081,共7页
Chinese Journal of Luminescence
基金
长沙市科技计划重大专项(kq1601013)
湖南省水生资源食品加工工程技术研究中心开放基金项目(2015GCZX07)
湖南省重点研发项目(2017NK2082)资助~~
关键词
掺氮碳量子点
微波法
优化条件
荧光强度
N-CQDs
microwave reaction method
optimal conditions
fluorescence intensity