一种简单的高量子产率氮掺杂荧光碳点的光谱研究及量子产率计算  

A Simple Approach for Preparation N-doped Carbon Dots with High Quantum Yield and Calculation for Quantum Yield

作　　者：王惠英[1] 陈丁龙[1] 张绍岩[1] 李爽 杨旭 梁莉 WANG Huiying;CHEN Dinglong;ZHANG Shaoyan;LI Shuang;YANG Xu;LIANG Li(College of Chemical Engineering,Shijiazhuang University,Hebei Province,Shijiazhuang 050035)

机构地区：[1]石家庄学院化工学院,河北石家庄050035

出　　处：《分析科学学报》2021年第3期346-350,共5页Journal of Analytical Science

基　　金：河北省科技厅科技计划(No.16214904);石家庄学院博士科研启动基金(No.19BS001);石家庄学院自然科学研究启动基金(No.10YB004)。

摘　　要：本实验采用柠檬酸铵为碳源和氮源,乙二胺为掺氮剂,用简单的水热法合成了一种高量子产率的氮掺杂荧光碳点。研究了不同的水热温度、反应时间和反应物配比对碳点的荧光强度的影响。发现水热温度为180℃,反应时间为5 h,柠檬酸铵与乙二胺的质量比例为2.6∶1时,合成碳点荧光强度最高,其最大发射峰在446 nm。同时考察了合成碳点在pH和紫外光照射下的稳定性。以硫酸奎宁作为标准荧光参照,测定并计算了合成的氮掺杂荧光碳点的量子产率,发现在最大激发波长360 nm下,碳点的荧光量子产率达到0.63。与文献相比,合成碳点的荧光量子产率优于大部分的报道。Herein,we prepared nitrogen-doped CDs by a simple hydrothermal method using ammonium citrate as carbon and nitrogen sources,and ethylenediamine as nitrogen additive,respectively.The effects of hydrothermal temperature,reaction time and ratio of the reagents on the fluorescence intensity for the as-prepared CDs were investigated.It was found that the optimum hydrothermal temperature,reaction time and mass ratio of ammonium citrate and ethylenediamine were 180℃,5 h and 2.6∶1,respectively,which gave the highest intensity and fluorescence peak located at 446 nm.The influence of pH and irradiation of UV light on the CDs were considered.Besides,using quinine sulfate as a standard fluorescence reference,it was calculated that the prepared N-doped CDs excited at 360 nm had a high fluorescence quantum yield of 0.63.Compared with the most reported values in literatures,the fluorescence quantum yield of synthesized CDs is better.

关 键 词：柠檬酸铵 乙二胺 水热法 荧光碳点 量子产率 

分 类 号：O657.39[理学—分析化学]