Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 23, Pages 18801-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b03281
Keywords
carbon dots; Schisandra chinensis polysaccharide; room-temperature phosphorescence; carbon dot/polyvinyl alcohol film; visual sensor
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Funding
- National Natural Science Foundation of China [31890773, 31570567]
- Fundamental Research Funds for the Central Universities [2572017ET02]
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Room-temperature phosphorescent (RTP) materials show great potential for ion detection due to a long lifetime and a high signal-to-noise ratio. Most RTP materials are limited to organometallic or organic compounds that are costly, toxic, and complex. Here, an in situ green synthesis of carbon dot (CD)-based RTP materials using Schisandra chinensis polysaccharide as the only carbon source, which has a natural nitrogen-containing structure for endogenous nitrogen-doping, is performed. RTP measurements show that the CD-based RTP materials had lifetimes up to 271.2 ms under 350 nm excitation and with a smaller energy gap (0.32 eV). In addition, they exhibit adequate quenching in the presence of iron ions (Fe3+). The visible RTP intensity is inversely proportional to the Fe3+ concentration over the range of 0.1-2 mM, with a 0.57 mu M detection limit. Further, the prepared CD-based RTP materials have highly stable optical and physical properties, which open a new perspective as luminescent sensors for Fe3+ detection with inexpensive and green raw materials.
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