Picard Maisyn, Thakur Suman, Misra Manjusri, Mohanty Amar K
Bioproducts Discovery and Development Centre, Department of Plant Agriculture, University of Guelph Crop Science Building 50 Stone Road East Guelph Canada
School of Engineering, University of Guelph Thornbrough Building 50 Stone Road East Guelph Canada.
RSC Adv. 2019 Mar 14;9(15):8628-8637. doi: 10.1039/c8ra10051a. eCollection 2019 Mar 12.
Novel fluorescent carbon dots (CDs) were synthesized using an economically feasible and green one-step heating process. , 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 -derived CDs (MCD) and doped MCD was confirmed 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 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 ions was utilized to selectively and sensitively detect Fe ions.
采用经济可行的绿色一步加热法合成了新型荧光碳点（CDs）。芒草是一种多年生草本植物，也是一种廉价的可持续生物质，被用作制备碳点和掺杂碳点（氮、磷和氮 - 磷双掺杂）的起始原料。通过傅里叶变换红外光谱（FTIR）和能量色散X射线光谱（EDS）证实了芒草衍生的碳点（MCD）和掺杂MCD中含氧官能团的丰富性。发现MCD、氮掺杂MCD、磷掺杂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MCD的量子产率（QY）分别为：MCD为4.71%，氮掺杂MCD为11.65%，磷掺杂MCD为2.33%，双掺杂MCD为9.63%。MCD和掺杂MCD表现出优异的激发依赖性光致发光特性，在紫外光（365nm）照射下发出强烈的蓝色荧光。氮掺杂MCD对铁离子表现出极好的选择性，检测限为20nM，检测范围为0.02至2000μM。利用制备的氮掺杂MCD的荧光发射强度与铁离子浓度之间的归一化线性关系来选择性和灵敏地检测铁离子。
