双发射碳点协同智能手机构建用于Ag^(+)和Cu^(2+)的便携式荧光比色传感器  

Dual-emission Carbon Dots Work with Smartphones to Build Portable Fluorescence Colorimetric Sensors for Ag^(+) and Cu^(2+)

作　　者：王丛丛 周恒博 任丽芳 申世刚[1,2] 马会春 董江雪 WANG Congcong;ZHOU Hengbo;REN Lifang;SHEN Shigang;MA Huichun;DONG Jiangxue(School of Chemistry and Materials Science,Hebei University,Baoding 071002,China;Engineering Research Center of Ecological Safety and Conservation in Beijing-Tianjin-Hebei(Xiong’an New Area)of Ministry of Education,Baoding 071002,China;Hebei Key Laboratory of Mineral Resources and Ecological Environment Monitoring,Baoding 050081,China)

机构地区：[1]河北大学化学与材料科学学院,保定071002 [2]京津冀(雄安新区)生态安全与生态保护教育部工程研究中心,保定071002 [3]河北省矿产资源与生态环境监测重点实验室,保定050081

出　　处：《高等学校化学学报》2025年第4期15-25,共11页Chemical Journal of Chinese Universities

基　　金：河北大学研究与创新团队项目(批准号:IT2023A03);河北省自然科学基金(批准号:B2024201050);国家自然科学基金(批准号:32401191)资助.

摘　　要：以柠檬酸、聚乙烯亚胺和邻苯二胺为碳源,通过水热法制备了发射蓝色和黄色荧光的碳点(CDs),将上述两种CDs通过自组装构筑成双发射探针(B/Y-CDs),构建了用于水溶液中Ag+和Cu^(2+)的可视化荧光传感器.采用高分辨透射电子显微镜、Zeta电位分析、X射线衍射谱和红外光谱对B/Y-CDs进行了表征.结果表明,B/Y-CDs的激发波长为350 nm,发射波长为465和555 nm,将Ag+引入体系后,黄色荧光强度显著降低,而蓝色荧光仅有少量减少;将Cu^(2+)引入体系后,黄色荧光强度显著增加,而蓝色荧光强度明显降低;进一步考察了pH值、时间和温度对传感器性能的影响.在最佳实验条件下,B/Y-CDs检测Ag+的线性范围为0.05~250μmol/L,检出限为19.70 nmol/L;B/Y-CDs检测Cu^(2+)的线性范围为0.02~200μmol/L,检出限为8.87 nmol/L.所构建的传感器具有良好的选择性,且可用于水环境中Ag+和Cu^(2+)的检测,样品回收率分别为93.7%~105.7%和95.3%~106.6%.此外,结合智能手机上的颜色识别器app,将构建的传感器整合到智能手机平台中以记录颜色变化,实现了对水溶液中Ag+和Cu^(2+)的快速、灵敏的可视化定量检测.Carbon dots(CDs)emitting blue and yellow fluorescence were synthesized via a hydrothermal method using citric acid,polyethyleneimine,and o-phenylenediamine as carbon sources.Two types of CDs were self-assembled into dual-emission probes(B/Y-CDs),which were utilized to construct visualized fluorescence sensors for detecting Ag+and Cu^(2+)in aqueous solutions.The B/Y-CDs were characterized using high-resolution transmission electron microscopy,zeta potential analysis,X-ray diffraction spectroscopy and infrared spectroscopy.Results indicated that the excitation wavelength of B/Y-CDs is 350 nm,with emission wavelengths at 465 nm and 555 nm.Upon the introduction of Ag+into the system,the intensity of yellow fluorescence decreased significantly,while the blue fluorescence exhibited only a slight decrease.When Cu^(2+)was introduced,the intensity of yellow fluorescence increased significantly,while the blue fluorescence intensity decreased markedly.The effects of pH,time,and temperature on sensor performance were further examined.Under optimal experimental conditions,the linear range of B/Y-CDs for detecting Ag+was 0.05-250μmol/L,the detection limit was 19.70 nmol/L;the linear range of B/Y-CDs for detecting Cu^(2+)was 0.02-200μmol/L,the detection limit is 8.87 nmol/L.The constructed sensor demonstrated good selectivity and can be utilized for the detection of Ag+and Cu^(2+)in aquatic environments,achieving sample recovery rates of 93.7%-105.7%and 95.3%-106.6%,respectively.Furthermore,the research integrated the sensor with a color recognition application on smartphones,enabling the recording of color changes and facilitating rapid and sensitive visual quantitative detection of Ag+and Cu^(2+)in an aqueous solution.

关 键 词：碳点 银离子 铜离子 荧光比率传感器 可视化检测 

分 类 号：O657.1[理学—分析化学]