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• W3196206820 abstract "In this work, the novel, simple Ni2+ sensors with high sensitivity, selectivity, accuracy, practicality, and adsorption capacity were developed from the label-free carbon dots. The carbon dots were prepared from polyurethane through a one-step pyrolysis method. They exhibited excitation-independent photoluminescence and offered a fluorescence quantum yield of 24 %. They were then tested for metal ion sensing, showing selectivity towards Ni2+ against a range of metal ions with a detection limit of 3.14 μM, the best for the carbon dots reported to date. A carbon dot-loaded paper-based sensor was also fabricated for Ni2+ detection, showing a limit of detection of 43.3 μM. The detection of Ni2+ in real water samples showed excellent recovery of 95.6 to 99.2 %. The selective detection of Ni2+ by the carbon dots arose from the inner filter effect and complex formation, leading to fluorescence quenching of the carbon dots. X-ray absorption analysis further confirmed the unique interaction and electron transfer from the carbon dots to Ni2+. In addition to high-performance sensing, the carbon dots demonstrated high adsorbent capacity towards Ni2+, in which one nanoparticle could accommodate up to 182 Ni2+ ions, equivalent to 234.8 mg g−1. This work demonstrates the unique sensing and adsorbent properties of polyurethane-derived carbon dots towards Ni2+, which can be applied for simultaneous monitoring and cleaning." @default.
• W3196206820 created "2021-08-30" @default.
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• W3196206820 date "2021-08-17" @default.
• W3196206820 modified "2023-10-02" @default.
• W3196206820 title "Highly sensitive Ni ²⁺ sensors based on polyurethane‐derived, label‐free carbon dots with high adsorption capacity" @default.
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• W3196206820 doi "https://doi.org/10.1002/slct.202102526" @default.
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