Abstract Carbon quantum dots (CQDs) were synthesized from agro-waste Ananas comosus by facile hydrothermal treatment. The synthesize CQDs are characterized by XRD, HRTEM, FTIR, XPS, UV–Visible spectral analysis, and Quantum yield (QY) measurements. The formation of CQDs has a typical particle size of 2.4 ± 0.5 nm which was measured by HR-TEM analysis. The fluorescence properties of CQDs show strong blue emission radiation with a QY of 10.65%. The NLO CQDs exhibit properties of self-defocusing and multi-photon absorbance when exposed to a continuous-wave laser (532 nm, 100 mW). The calculated third-order NLO parameters, like β, n2, and χ(3) was obtained to be in the order of 3.0864×10-4 cm/W, 8.5137 ×10-9 cm2/W, and 3.2882 ×10-7 (esu), respectively. Antibacterial activities of CQDs were screened against (S. aureus, B. cereus, E. coli, P. aeruginosa, and V. cholera) microbial organisms and Antioxidant assay of the CQDs was assessed against the DPPH method. Furthermore, the synthesized CQDs will be applicable to NLO devices and pharmaceutical applications. ___________________________________________________________________________

中文翻译：

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来自 Ananas comosus 废果皮的荧光碳量子点：一种用于 NLO 行为、抗菌和抗氧化活性的有前途的材料

摘要 以农业废弃物 Ananas comosus 为原料，通过简单的水热处理合成了碳量子点（CQDs）。合成的 CQD 通过 XRD、HRTEM、FTIR、XPS、紫外-可见光谱分析和量子产率 (QY) 测量表征。CQD 的形成具有典型的 2.4 ± 0.5 nm 粒径，这是通过 HR-TEM 分析测量的。CQDs 的荧光特性显示出强蓝色发射辐射，QY 为 10.65%。NLO CQD 在暴露于连续波激光 (532 nm, 100 mW) 时表现出自散焦和多光子吸收的特性。计算得到的三阶 NLO 参数，如 β、n2 和 χ(3) 为 3.0864×10-4 cm/W、8.5137 ×10-9 cm2/W 和 3.2882 ×10-7 (esu)，分别。筛选了 CQD 的抗菌活性（金黄色葡萄球菌、蜡状芽孢杆菌、大肠杆菌、铜绿假单胞菌、和霍乱弧菌）微生物和 CQD 的抗氧化测定是针对 DPPH 方法进行评估的。此外，合成的 CQD 将适用于 NLO 设备和制药应用。___________________________________________________________________________