Mussel‐inspired polydopamine‐encapsulated carbon dots with dual emission for detection of 4‐nitrophenol and Fe3+. (2nd November 2020)

• Record Type: Journal Article
• Authors: Liu, Qian; Zhao, Feifei; Shi, Bingfeng; Lü, Changli
• Is Part Of: Luminescence. Volume 36:Number 2(2021)
• Page Start: 431
• Page End: 442
• Publication Date: 2020-11-02
• Subjects: carbon dots -- dual emission -- fluorescence detection -- internal filtering effect -- polydopamine; Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.3961
• Languages: English
• ISSNs: 1522-7235

Abstract

Abstract: Carbon dots (CDs) with excellent optical properties are widely used in biomedicine, fluorescence sensing, and light‐emitting diodes (LEDs). However, it is still a challenge to prepare CDs that can stably emit red fluorescence in the water environment. In this study, polydopamine‐encapsulated luminescent carbon dots (CDs@PDA) with an encapsulating structure were synthesized at room temperature from p ‐phenylenediamine‐derived red‐light CDs as the core and using mussel‐inspired chemical properties of polydopamine (PDA). In the binary system of water:ethanol = 1: 3 (volume ratio), the as‐prepared CDs@PDA had a dual emission of ultraviolet light (330 nm) and red light (640 nm) with the fluorescence quantum yields of 8.0 and 15.5%, respectively, at the same time under 285 nm light excitation. The as‐prepared CDs@PDA could be directly used for fluorescence selective sensing of 4‐nitrophenol (4‐NP) and Fe 3+ through simultaneously quenching of ultraviolet and red fluorescence based on the internal filtration effect mechanism with detection limits of 3.44 and 3.75 μM, respectively. This research showed that PDA‐coated CDs can significantly improve the photoluminescence stability of CDs with new optical features. This means that the encapsulated structure of mussel chemistry is very helpful for expanding the application range of CDs in the water environment. Abstract : A mussel‐inspired route was developed to fabricate polydopamine‐coated carbon dots (CDs@PDA) with dual emission of ultraviolet light and red light. The as‐prepared CDs@PDA were used as a fluorescent probe for the selective detection of 4‐nitrophenol and Fe 3+ using the internal filter effect mechanism.