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Miscanthus grass-derived carbon dots to selectively detect Fe3+ ions

机译：来自芒草的碳点可选择性检测Fe3 +离子

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摘要

Novel fluorescent carbon dots (CDs) were synthesized using an economically feasible and green one-step heating process. Miscanthus , a perennial grass and an inexpensive sustainable biomass, was utilized as the starting material to prepare CDs and doped CDs (nitrogen, phosphorous and nitrogen-phosphorous dual doped). The abundance of oxygen-containing functional groups in Miscanthus -derived CDs (MCD) and doped MCD was confirmed via Fourier-transform infrared (FTIR) and energy dispersive X-ray spectroscopy (EDS). The average size of MCD, N-doped MCD, P-doped MCD and dual-doped MCDs was found to be 7.87 ± 0.27, 4.6 ± 0.21, 6.7 ± 0.38 and 5.3 ± 0.32 nm, respectively. The synthesized MCD and doped MCD exhibited a quantum yield (QY) of 4.71, 11.65, 2.33 and 9.63% for the MCD, N-doped MCD, P-doped MCD and dual-doped MCD, respectively. MCD and doped MCD exhibited excellent excitation-dependent photoluminescence properties, with strong blue fluorescence upon irradiation with UV-light (365 nm). N-doped MCD exhibited superb selectivity towards Fe ~(3+) ions, with a detection limit of 20 nM and a detection range from 0.02 to 2000 μM. The normalized linear relationship between the intensity of fluorescence emission of the prepared N-doped MCD and the concentration of Fe ~(3+) ions was utilized to selectively and sensitively detect Fe ~(3+) ions.
机译：使用经济可行的绿色一步加热工艺合成了新型荧光碳点（CD）。多年生草和廉价的可持续生物质芒草被用作制备CD和掺杂CD（氮，磷和氮-磷双重掺杂）的原料。通过傅里叶变换红外（FTIR）和能量色散X射线光谱（EDS）证实了来自芒草的CD（MCD）和掺杂的MCD中的大量含氧官能团。发现MCD，N掺杂MCD，P掺杂MCD和双掺杂MCD的平均尺寸分​​别为7.87±0.27、4.6±0.21、6.7±0.38和5.3±0.32nm。合成的MCD和掺杂的MCD对MCD，N掺杂的MCD，P掺杂的MCD和双掺杂的MCD分别显示出4.71％，11.65％，2.33％和9.63％的量子产率（QY）。 MCD和掺杂的MCD表现出优异的激发依赖性光致发光特性，在紫外线（365 nm）照射下具有强烈的蓝色荧光。 N掺杂的MCD对Fe〜（3+）离子表现出极好的选择性，检测限为20 nM，检测范围为0.02至2000μM。利用制备的N掺杂MCD的荧光发射强度与Fe〜（3+）离子浓度之间的归一化线性关系来选择性和灵敏地检测Fe〜（3+）离子。

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