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<p>Carbon quantum dots are a new type of fluorescent material with promising application prospects in bioimaging, photocatalysis, and metal ions detection. Biomass is a plentiful and renewable natural resource containing a large amount of carbon, hydrogen and oxygen, and is an ideal precursor for the preparation of carbon quantum dots. Although biomass-based carbon dots possess numerous advantages, there are still several challenges. Specifically, the luminescence mechanism remains unidentified. Additionally, how to control the surface functionalization of biomass-based carbon dots is also a challenge. In this work, nitrogen-doped carbon quantum dots were synthesized sheep manure with glycine under optimized hydrothermal conditions to enhance nitrogen-containing functional groups. The results showed that the nitrogen-doped carbon quantum dots were synthesized when sheep manure mixed with glycine in a mass ratio of 4:1 and reacted at 240 ℃ for 12 h exhibited a quantum yield of 10.63%, a fluorescence lifetime of 7.82 ns, and exceptional stability—retaining fluorescence intensity above 630,855 a.u. after 30&#xa0;days of storage. Furthermore, the nitrogen-doped carbon quantum dots exhibit high selectivity and sensitivity to Fe<sup>3+</sup> (detection limit:4.7&#xa0;μM, linear range: 0–200 μM) along with excellent bioimaging performance in L929 cells, demonstrating their dual-functional applications in both environmental sensing and bioimaging.</p>

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Preparation of Nitrogen-Doped Biomass-Based Carbon Quantum Dots and their Application to Fe3+ Detection and Bioimaging

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Rui Lv,
  • Liyu Wu,
  • Fuli Tian,
  • Hongmei Bai,
  • Dongke Huang,
  • Yanqiu Lei,
  • Fenrong Liu

摘要

Carbon quantum dots are a new type of fluorescent material with promising application prospects in bioimaging, photocatalysis, and metal ions detection. Biomass is a plentiful and renewable natural resource containing a large amount of carbon, hydrogen and oxygen, and is an ideal precursor for the preparation of carbon quantum dots. Although biomass-based carbon dots possess numerous advantages, there are still several challenges. Specifically, the luminescence mechanism remains unidentified. Additionally, how to control the surface functionalization of biomass-based carbon dots is also a challenge. In this work, nitrogen-doped carbon quantum dots were synthesized sheep manure with glycine under optimized hydrothermal conditions to enhance nitrogen-containing functional groups. The results showed that the nitrogen-doped carbon quantum dots were synthesized when sheep manure mixed with glycine in a mass ratio of 4:1 and reacted at 240 ℃ for 12 h exhibited a quantum yield of 10.63%, a fluorescence lifetime of 7.82 ns, and exceptional stability—retaining fluorescence intensity above 630,855 a.u. after 30 days of storage. Furthermore, the nitrogen-doped carbon quantum dots exhibit high selectivity and sensitivity to Fe3+ (detection limit:4.7 μM, linear range: 0–200 μM) along with excellent bioimaging performance in L929 cells, demonstrating their dual-functional applications in both environmental sensing and bioimaging.