Scholarlink

<p>Nitrogen and sulfur co-doped carbon quantum dots (N, S-CQDs) with enhanced photoluminescence were synthesized via a hydrothermal method using citric acid and thiourea as the precursors. The optimized synthesis yielded a high quantum yield (50.14%), surpassing many previously reported N, S-CQDs, with excellent fluorescence stability and a low detection limit (LOD = 0.184&#xa0;µM) for Fe<sup>3+</sup> sensing. Spectroscopic analysis confirmed successful heteroatom incorporation, where C=S and C–N functional groups introduced new defect states, enhancing fluorescence efficiency. Fe<sup>3+</sup>-induced fluorescence quenching followed a dynamic quenching mechanism, as confirmed by Stern–Volmer analysis, fluorescence lifetime measurements, and FTIR spectral shifts. The N, S-CQDs exhibited high selectivity for Fe<sup>3+</sup> over competing metal ions and demonstrated practical applications in real water sample analysis<b>,</b> with stable recovery rates (96.83–104.19%) in both clean and industrially polluted water. This study provides a high-QY, low-LOD Fe<sup>3+</sup> fluorescence sensor that offers a balance between sensitivity, selectivity, and environmental applicability, reinforcing the potential of N, S-CQDs for real-world metal ion detection and environmental monitoring.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancement of carbon quantum dot luminescence efficiency through N, S co-doping for rapid ion Fe3+ detection

  • 期刊论文

  • 发表日期：

    2025年5月3日

查看全文
  • Huu Phuc Dang,
  • Vo Thi Ngoc Thuy,
  • Bui Thi Diem,
  • Nguyen Quoc Thang,
  • Nguyen Thi Mai Tho

摘要

Nitrogen and sulfur co-doped carbon quantum dots (N, S-CQDs) with enhanced photoluminescence were synthesized via a hydrothermal method using citric acid and thiourea as the precursors. The optimized synthesis yielded a high quantum yield (50.14%), surpassing many previously reported N, S-CQDs, with excellent fluorescence stability and a low detection limit (LOD = 0.184 µM) for Fe3+ sensing. Spectroscopic analysis confirmed successful heteroatom incorporation, where C=S and C–N functional groups introduced new defect states, enhancing fluorescence efficiency. Fe3+-induced fluorescence quenching followed a dynamic quenching mechanism, as confirmed by Stern–Volmer analysis, fluorescence lifetime measurements, and FTIR spectral shifts. The N, S-CQDs exhibited high selectivity for Fe3+ over competing metal ions and demonstrated practical applications in real water sample analysis, with stable recovery rates (96.83–104.19%) in both clean and industrially polluted water. This study provides a high-QY, low-LOD Fe3+ fluorescence sensor that offers a balance between sensitivity, selectivity, and environmental applicability, reinforcing the potential of N, S-CQDs for real-world metal ion detection and environmental monitoring.