Scholarlink

<p>Graphene quantum dots (GQDs) are highly valued for their chemical stability, tunable size, and biocompatibility. Utilizing green chemistry, a microwave-assisted synthesis method was employed to produce water-soluble GQDs from Mangifera Indica leaf extract. This approach is efficient, cost-effective, and environmentally friendly, offering reduced reaction times, energy consumption, and uniform particle sizes, and has proven advantageous over other methods. Water-soluble GQDs were synthesized using Mangifera Indica leaf extract, which ranged less than 15&#xa0;nm in diameter, confirmed by high-resolution transmission electron microscopy with a lattice spacing of 0.34&#xa0;nm. The GQDs exhibited strong photoluminescence with bright red fluorescence under UV light and excitation-independent emission at 662&#xa0;nm with excitation wavelengths ranging from 300 to 500&#xa0;nm, achieving a quantum yield of 10.3%. A peak at 27.2˚ was recorded corresponding to the graphite's (002) plane diffraction peak. Raman spectroscopy confirmed their graphitic nature and sp<sup>2</sup> crystallinity, with an intensity ratio of D and G peak I<sub>D</sub>/I<sub>G</sub> ratio of 1.12. Biocompatibility assays (MTT and live/dead) showed better results at lower concentrations (1&#xa0;mg/ml) while higher concentrations (2&#xa0;mg/ml) showed reduced efficacy. Antioxidant tests revealed increased DPPH scavenging activity with higher GQD concentrations and longer incubation times. The GQDs demonstrated excellent performance as fluorescent biosensors for Ni<sup>2</sup>⁺ (0.15&#xa0;ppm) and Fe<sup>3</sup>⁺ (0.20&#xa0;ppm), with high selectivity in river water samples, highlighting their potential for environmental and health applications.</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

Microwave-Assisted Green Synthesis of Fluorescent Graphene Quantum Dots: Metal Sensing, Antioxidant Properties, and Biocompatibility Insights

  • 期刊论文

  • 发表日期：

    2025年1月18日

查看全文
  • Parul Singh,
  • Hitasha Vithalani,
  • Aditya Adhyapak,
  • Tinodaishe Semwa,
  • Nihal Singh,
  • Mukesh Dhanka,
  • Dhiraj Bhatia,
  • Jhuma Saha

摘要

Graphene quantum dots (GQDs) are highly valued for their chemical stability, tunable size, and biocompatibility. Utilizing green chemistry, a microwave-assisted synthesis method was employed to produce water-soluble GQDs from Mangifera Indica leaf extract. This approach is efficient, cost-effective, and environmentally friendly, offering reduced reaction times, energy consumption, and uniform particle sizes, and has proven advantageous over other methods. Water-soluble GQDs were synthesized using Mangifera Indica leaf extract, which ranged less than 15 nm in diameter, confirmed by high-resolution transmission electron microscopy with a lattice spacing of 0.34 nm. The GQDs exhibited strong photoluminescence with bright red fluorescence under UV light and excitation-independent emission at 662 nm with excitation wavelengths ranging from 300 to 500 nm, achieving a quantum yield of 10.3%. A peak at 27.2˚ was recorded corresponding to the graphite's (002) plane diffraction peak. Raman spectroscopy confirmed their graphitic nature and sp2 crystallinity, with an intensity ratio of D and G peak ID/IG ratio of 1.12. Biocompatibility assays (MTT and live/dead) showed better results at lower concentrations (1 mg/ml) while higher concentrations (2 mg/ml) showed reduced efficacy. Antioxidant tests revealed increased DPPH scavenging activity with higher GQD concentrations and longer incubation times. The GQDs demonstrated excellent performance as fluorescent biosensors for Ni2⁺ (0.15 ppm) and Fe3⁺ (0.20 ppm), with high selectivity in river water samples, highlighting their potential for environmental and health applications.