Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (6): 20230510.doi: 10.7503/cjcu20230510

• Analytical Chemistry • Previous Articles     Next Articles

Room Temperature Driven Sodium Humate-protected Carbon Nanoclusters for Fluorescent and Colorimetric Sensing of Ag+ and Temperature

LI Lin1,2,3(), MA Jing1, XU Changlin1, CHEN Tongyao1, GUO Hengyao1, LI Ziyou1, WU Wenxin1   

  1. 1.College of Chemistry and Materials,Taiyuan Normal University,Jinzhong 030619,China
    2.Humic Acid Engineering and Technology Research Center of Shanxi Province,Jinzhong 030619,China
    3.Laboratory of Protein?based Functional Materials of Shanxi Province,Jinzhong 030619,China
  • Received:2023-12-13 Online:2024-06-10 Published:2024-03-12
  • Contact: LI Lin E-mail:lilin@tynu.edu.cn
  • Supported by:
    the Fundamental Research Program of Shanxi Province, China(202203021221216);the Research Fund of Science and Technology Innovation Platform of Shanxi Province, China(410220367);the Teaching Reform Innovation Programs of Higher Education Institutions of Shanxi Province, China(J20220930)

Abstract:

Based on hydrogen bonding self-assembly strategy, hypotoxicity and water-soluble cyan fluorescent carbon nanoclusters(HAN-CNCs) were constructed to employ a highly-efficient green economy and room temperature synthesis method, which used ascorbic acid and high biocompatibility coal-based sodium humate with abundant hydroxy as raw materials. The as-prepared HAN-CNCs can be specifically quenched by Ag+ at pH of 5.0, with a wide detection range (5.0—300 μmol/L) and a low detection limit of 27.5 nmol/L. It was found that Ag+ can induce fluorescence static quenching of the HAN-CNCs, owing to the coordination interaction between Ag+ and amine groups or carbonyl groups on the surface of HAN-CNCs. More interestingly, the colorimetric detection of Ag+ could be additionally realized by visible color conversion (yellowish-rubricans) under the daylight lamp and the cyan fluorescence gradually changed to blue purple under the irradiation of an ultraviolet lamp. From this, the HAN-CNCs were employed in the fabrication portable test strip for colorimetry monitoring of Ag+via the green-blue(G/B) analysis. In addition, HAN-CNCs exhibit an excellent reversible thermal response in the range of 20—85 ℃ and have potential as a temperature sensor. Furthermore, the HAN-CNCs exhibited a low biotoxicity and an excellent cell permeability when selectively detecting Ag+ in living cells by fluorescence microscopy imaging, indicating that the sensing system can be effectively applied to assessing potential risks and health security.

Key words: Coal-based sodium humate, Carbon nanocluster, Room temperature driven, Colorimetric fluorescence detection of Ag+, Temperature sensing

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