作者：陈文静, 伍贤学, 吴云英, 李亮星, 肖群, 雷旭, 罗义, 鄢林琼, 谢建新

作者单位：玉溪师范学院化学生物与环境学院，云南 玉溪 653100

关键词：N, S共掺杂碳点;微波法;Fe³⁺检测;纳米温度计

摘要：

以韭菜为前驱体，采用微波法一步绿色合成N, S共掺杂的粒径均匀、分散性好的碳点。所合成的碳点近似球状，粒径2.0~5.0 nm。在365 nm的紫外灯照射下发明亮的蓝色荧光，发射峰具有激发波长依赖性。Fe³⁺对所制备的碳点有明显选择性荧光猝灭现象。在5~300 μmol/L的范围内，荧光猝灭程度(F/F₀)与Fe³⁺浓度呈现良好的线性关系（R=0.9930），检测限为4.0 μmol/L。同时探测温度对制备碳点的影响，在20~55 ℃范围内，碳点荧光强度与温度具有较好的线性响应。由于生理温度范围在此温度范围内，所制备的碳点可用于细胞温度传感。

Microwave green synthesis of N, S co-doped carbon dots and their application in Fe³⁺ detection and temperature sensor
CHEN Wenjing, WU Xianxue, WU Yunying, LI Liangxing, XIAO Qun, LEI Xu, LUO Yi, YAN Linqiong, XIE Jianxin
School of Chemistry, Biology and Environment, Yuxi Normal University, Yuxi 653100, China
Abstract: The N, S co-doped carbon dots (CDs) which have uniform particle size and good dispersion were synthesized through one-pot microwave green synthesis using garlic chives as the precursor. The prepared CDs are nearly spherical and the diameters are distributed in the range of 2.0–5.0 nm. Under 365 nm UV light, the CDs solution shows a brightly blue fluorescence emission, the excitation dependent emission phenomenon is observed. Fe³⁺ showed the obvious and selective fluorescence quenching effect on the synthesized CDs. There was a good linear relationship between fluorescence quenching intensity (F/F₀) and Fe³⁺ concentration (R=0.9930), in the range of Fe³⁺ concentrations from 5 to 300 μmol/L, the detection limit was as low as 4.0 μmol/L. Meanwhile, the influence of temperature on CDs was investigated, the fluorescence intensity of CDs has a good linear response to temperature over the physiological temperature range (20-55 ℃), which makes the synthesized CDs has potential application value of cellular temperature sensing.
Keywords: N, S co-doped carbon dots;microwave method;Fe³⁺ detection;temperature nanosensor
2021, 47(3):64-69  收稿日期: 2020-03-16;收到修改稿日期: 2020-05-02
基金项目: 国家自然科学基金（21465024）；云南省教育厅指导性项目（2017ZDX135)；玉溪师范学院大学生创新创业训练项目（2017B32，2017B30）；云南省地方本科高校（部分）基础研究联合专项青年项目（2019FH001(-112),2019FH001(-090)）；云南省创新训练项目（202011390012）；云南省教育厅科学研究基金项目（2018JS421）；云南省科技厅科技计划项目（2018FD091）
作者简介: 陈文静(1986-),女,陕西洛南县人,讲师,硕士,研究方向为分析化学
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