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<p>This study successfully synthesized multifunctional nitrogen- and sulfur-doped carbon quantum dots (N, S-CQDs) using thiobenzamide and citric acid as precursors through a hydrothermal process under neutral conditions. The synthesized N, S-CQDs exhibited an average diameter of approximately 15&#xa0;nm, which is notably larger than that of unmodified CQDs. Unlike conventional CQDs, the N, S-CQDs demonstrated stable yellow fluorescence that remained invariant under different excitation wavelengths. Furthermore, their surface functional groups endowed them with multifunctional luminescent properties. Specifically, these functional groups enhanced the sensitivity toward Cu<sup>2+</sup>, enabling the N, S-CQDs to exhibit a response to Cu<sup>2+</sup> with extremely low detection limit (LOD) of 0.197684 and 0.149791, thus demonstrating excellent Cu<sup>2+</sup> detection performance. Additionally, the N, S-CQDs displayed unique yellow luminescence with a quantum yield of 28.05%, rendering them a promising alternative to YAG: Ce<sup>3</sup>⁺ for applications in white light LEDs and fluorescent anti-counterfeiting labels. The fabricated simple WLED achieves an EQE of 32.39% with chromaticity coordinates of (0.3299, 0.2718). Given the simplicity and efficiency of the synthesis method, these N, S-CQDs hold significant potential for diverse applications across multiple fields.</p>

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Simple synthesis of multifunctional N, S-doped carbon quantum dots for Cu2⁺ ion detection and luminescent applications

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Qizheng Dong,
  • Xiangyu Ren,
  • Huimin Xie,
  • Ling He

摘要

This study successfully synthesized multifunctional nitrogen- and sulfur-doped carbon quantum dots (N, S-CQDs) using thiobenzamide and citric acid as precursors through a hydrothermal process under neutral conditions. The synthesized N, S-CQDs exhibited an average diameter of approximately 15 nm, which is notably larger than that of unmodified CQDs. Unlike conventional CQDs, the N, S-CQDs demonstrated stable yellow fluorescence that remained invariant under different excitation wavelengths. Furthermore, their surface functional groups endowed them with multifunctional luminescent properties. Specifically, these functional groups enhanced the sensitivity toward Cu2+, enabling the N, S-CQDs to exhibit a response to Cu2+ with extremely low detection limit (LOD) of 0.197684 and 0.149791, thus demonstrating excellent Cu2+ detection performance. Additionally, the N, S-CQDs displayed unique yellow luminescence with a quantum yield of 28.05%, rendering them a promising alternative to YAG: Ce3⁺ for applications in white light LEDs and fluorescent anti-counterfeiting labels. The fabricated simple WLED achieves an EQE of 32.39% with chromaticity coordinates of (0.3299, 0.2718). Given the simplicity and efficiency of the synthesis method, these N, S-CQDs hold significant potential for diverse applications across multiple fields.