Modified triazine-based carbon nitride as a high efficiency fluorescence sensor for the label-free detection of Ag +
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Modified triazine-based carbon nitride as a high efficiency fluorescence sensor for the label-free detection of Ag+ Liying Hao1,2 , Hongjie Song1,a) , Yi Lv3 1
Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China 3 Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 18 July 2020; accepted: 20 October 2020
A triazine-based graphite carbon nitride (tri-C3N4) was successfully prepared using a solid and mild method, and modified through concentrated acid and the hydrothermal method. Interestingly, the modified tri-C3N4 (tri-HC3N4) showed good water stability and excellent fluorescence property. Meanwhile, tri-HC3N4 was successfully used to construct a high-sensitive and selective fluorescence sensor to Ag+. The as-prepared fluorescence sensor showed a fast response and a low detection limit as 0.4046 μM. Moreover, the possible quenching mechanisms were discussed based on the photoinduced electron transfer and the formation of new complex between tri-HC3N4 and Ag+ with the help of the related characterizations. This study does not only provide a new tri-HC3N4 for a high efficiency fluorescence sensor, but also show the potential application in biological sciences.
Introduction Graphitic carbon nitride (g-C3N4), a novel metal-free, twodimensional carbonaceous materials, shows excellent physicochemical properties, including low-cost, large surface area, high fluorescence quantum yield, good biocompatibility, nontoxicity, and good photocatalytic activity [1, 2, 3], and has been aroused great interest of researchers. Thereby, g-C3N4 has been widely applied in variety of applications, including solar cells [4], chemical and biological sensing [5, 6, 7, 8, 9, 10, 11], catalysis [12, 13, 14], cataluminescence sensor [15], and pollutant degradation [16, 17, 18] and so on. Generally speaking, triazine and tri-s-triazine-based structure were the two common structures of g-C3N4 (Supplementary Fig. S1). Some groups have reported that tri-s-triazine-based g-C3N4 (tri-s-C3N4) was stable [19], also used in the detection of metal ions [20, 21], organic pollutant [22] and DNA [23], miRNA [24], and so on. However, the prepared pure g-C3N4 showed poor water solubility and large particle size [9], thus limiting the applications in many areas. Also, the blue fluorescence for the tri-s-triazine-based C3N4 was similar to the nuclear staining, which was bad for the localization in the
nucleus. Therefore, g-C3N4-based material owning a good water solubility and good fluorescence property was necessary to study to construct a fluorescence sensor for environment and biomedicine. Silver has been widely applied in cosmetic, agriculture, medicine, food science, and other industries becau
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