Tarasenka Natalie, Stupak Aleksandr, Tarasenko Nikolai, Chakrabarti Supriya, Mariotti Davide
B.I. Stepanov Institute of physics, National Academy of Sciences of Belarus, 68 Nezalezhnasti ave., 220072, Minsk, Belarus.
Plasma Science and Nanoscale Engineering Group, Nanotechnology & Integrated Bio-Engineering Centre (NIBEC), Ulster University, Shore Road, BT37 0QB, Newtownabbey, UK.
Chemphyschem. 2017 May 5;18(9):1074-1083. doi: 10.1002/cphc.201601182. Epub 2017 Feb 2.
In this paper, we report the one-step synthesis of luminescent carbon nanoparticles (NPs) via laser irradiation of a graphite target in a solvent [H O, ethanol, or a 0.008 m aqueous diethylenetriaminepentaacetic acid (DTPA) solution]. This is a simple approach for the fabrication of carbon dots with tunable photoluminescence (PL) that differs from other preparation methods, as no post-passivation step is required. The unfocused beam of the second harmonic (wavelength 532 nm) of the Nd:YAG laser was used in our experiments. The sizes of the prepared NPs were mainly distributed in the range of 1-8 nm with an average value of 3 nm. Carbon NPs of different inner structure were prepared: hexagonal diamond phase in aqueous DTPA solution, orthorhombic carbon phase in ethanol, and amorphous carbon in water. The synthesized carbon NPs have strong luminescence in the visible region, which makes them attractive for numerous biological applications. The photoluminescence of the synthesized NPs was investigated at different excitation wavelengths, from 260 to 450 nm. The highest intensities of the emission bands were detected for an excitation wavelength of 400 nm.
在本文中，我们报道了通过在溶剂（水、乙醇或0.008 m的二乙烯三胺五乙酸（DTPA）水溶液）中对石墨靶进行激光辐照一步合成发光碳纳米颗粒（NPs）。这是一种制备具有可调光致发光（PL）的碳点的简单方法，与其他制备方法不同，因为不需要后钝化步骤。我们的实验中使用了Nd:YAG激光的二次谐波（波长532 nm）的未聚焦光束。制备的NPs尺寸主要分布在1 - 8 nm范围内，平均值为3 nm。制备了不同内部结构的碳NPs：在DTPA水溶液中为六方金刚石相，在乙醇中为正交碳相，在水中为非晶碳。合成的碳NPs在可见光区域具有强发光，这使其在众多生物应用中具有吸引力。在260至450 nm的不同激发波长下研究了合成NPs的光致发光。对于400 nm的激发波长，检测到发射带的最高强度。
