高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (4): 20240422.doi: 10.7503/cjcu20240422

• 分析化学 • 上一篇    下一篇

双发射碳点协同智能手机构建用于Ag+和Cu2+的便携式荧光比色传感器

王丛丛1, 周恒博1, 任丽芳1, 申世刚1,2, 马会春3(), 董江雪1()   

  1. 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
  • 收稿日期:2024-09-11 出版日期:2025-04-10 发布日期:2024-10-29
  • 通讯作者: 马会春,董江雪 E-mail:18931283309@163.com;dongjxue@163.com
  • 基金资助:
    河北大学研究与创新团队项目(IT2023A03);河北省自然科学基金(B2024201050);国家自然科学基金(32401191)

Dual-emission Carbon Dots Work with Smartphones to Build Portable Fluorescence Colorimetric Sensors for Ag+ and Cu2+

WANG Congcong1, ZHOU Hengbo1, REN Lifang1, SHEN Shigang1,2, MA Huichun3(), DONG Jiangxue1()   

  1. 1.School of Chemistry and Materials Science,Hebei University,Baoding 071002,China
    2.Engineering Research Center of Ecological Safety and Conservation in Beijing?Tianjin?Hebei(Xiong’an New Area) of Ministry of Education,Baoding 071002,China
    3.Hebei Key Laboratory of Mineral Resources and Ecological Environment Monitoring,Baoding 050081,China
  • Received:2024-09-11 Online:2025-04-10 Published:2024-10-29
  • Contact: MA Huichun, DONG Jiangxue E-mail:18931283309@163.com;dongjxue@163.com
  • Supported by:
    the Research and Innovation Team of Hebei University, China(IT2023A03);the Natural Science Foundation of Hebei Province, China(B2024201050);the National Natural Science Foundation of China(32401191)

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Cu2+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Cu2+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0.05~250 μmol/L, 检出限为19.70 nmol/L; B/Y-CDs检测Cu2+的线性范围为0.02~200 μmol/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Cu2+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Cu2+的快速、 灵敏的可视化定量检测.

关键词: 碳点, 银离子, 铜离子, 荧光比率传感器, 可视化检测

Abstract:

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 Cu2+ 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 Cu2+ 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—250 μmol/L, the detection limit was 19.70 nmol/L; the linear range of B/Y-CDs for detecting Cu2+ was 0.02—200 μmol/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 Cu2+ 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 Cu2+ in an aqueous solution.

Key words: Carbon dot, Silver ion, Copper ion, Fluorescence ratio sensor, Visual detection

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