Scholarlink

<p>In this study, carbon quantum dots (CQDs) were synthesised <i>via</i> a hydrothermal method using five fruit sources—peach, banana, strawberry, pear, and guava—under identical conditions (200°C, 4&#xa0;h). The resulting yellow solutions displayed blue–green fluorescence under UV illumination. Characterisation showed spherical CQDs (1–5&#xa0;nm) with amorphous, oxidised graphitic structures comprising both sp2 and sp3 hybridisations. The degree of oxidation, primarily associated with carbonyl (C=O) functional groups, was found to influence their optical properties. A formation mechanism involving fructose, vitamin C, and pectin was proposed. Optical analysis indicated π–π* and n–π* transitions, with emission peaks at 508 and 528&#xa0;nm upon excitation at 460&#xa0;nm. The band gaps ranged from 2.72 to 3.78&#xa0;eV, increasing with the extent of oxidation.</p> Graphical abstract <p></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

Comparison of the optical properties of quantum dots synthesized by the hydrothermal method from fruit sources

  • 期刊论文

  • 发表日期：

    2025年9月25日

查看全文
  • Carlos Alfredo Zamora-Valencia,
  • Daniela Edith Salado-Leza,
  • Josué Esaú Muñoz-Pérez,
  • Demetrio Mendoza-Anaya,
  • Vicente Garibay-Febles,
  • Ventura Rodríguez-Lugo

摘要

In this study, carbon quantum dots (CQDs) were synthesised via a hydrothermal method using five fruit sources—peach, banana, strawberry, pear, and guava—under identical conditions (200°C, 4 h). The resulting yellow solutions displayed blue–green fluorescence under UV illumination. Characterisation showed spherical CQDs (1–5 nm) with amorphous, oxidised graphitic structures comprising both sp2 and sp3 hybridisations. The degree of oxidation, primarily associated with carbonyl (C=O) functional groups, was found to influence their optical properties. A formation mechanism involving fructose, vitamin C, and pectin was proposed. Optical analysis indicated π–π* and n–π* transitions, with emission peaks at 508 and 528 nm upon excitation at 460 nm. The band gaps ranged from 2.72 to 3.78 eV, increasing with the extent of oxidation.

Graphical abstract