Sunlight and UV driven synthesis of Ag nanoparticles for fluorometric and colorimetric dual-mode sensing of ClO

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 229; p. 117996
• Main Authors: Wang, Xu, Tang, Hong, Tian, Xinming, Zeng, Ranying, Jia, Zejin, Huang, Xiaohuan
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 15.03.2020
• Subjects: Ag nanoparticles; ClO− detection; Fluorometric and colorimetric sensing; Green synthesis; Rapid detection; Green synthesis; Ag nanoparticles; Fluorometric and colorimetric sensing; ClO− detection; Rapid detection; ClO(−) detection
• ISSN: 1386-1425; 1873-3557
• DOI: 10.1016/j.saa.2019.117996

A photo-responsive compound BINOL-LA (1) having a rigid backbone ending up with two 5-membered cyclic disulfide moieties was designed. BINOL-LA capped Ag nanoparticles (1@Ag NPs) with a network structure were synthesized in a green way by sunlight or UV lamp irradiation. 1@Ag NPs exhibit a selective recognition towards ClO− in aqueous solution with a switch-on fluorescence response and a visual color change, with detection limits of 0.17 μM and 1.54 μM, respectively. The sensing mechanism is based on the ClO−-mediated oxidation of AgS bond, resulting in a disaggregation of 1@Ag NPs assembly. With the strategy demonstrated here, ClO− in tap water and lake water can be detected quantitatively in 5 s. [Display omitted] •We realized the fabrication of 1@Ag NPs in a green way by sunlight or UV lamp irradiation.•1@Ag NPs exhibited a short response time of 5 s for ClO− detection.•The assembly shows a “switch on” fluorescence response and visual color change upon ClO− addition.•The sensing mechanism is based on ClO− induced disaggregation of 1@Ag NPs network structure.