Measurement of Fluorescence Spectra and Quantum Yield of Carbon Nanoparticles Made from Monosodium Glutamate
Abstract: In this article, fluorescent carbon nanoparticles (Glu-FCN), made by monosodium glutamate pyro-lysis, have been researched, mainly including measurements of Glu-FCN fluorescent spectra and quantum yields. On one hand, pH dependence has been shown to be present in Glu-FCN according to our works. The fluorescence intensity is pretty low when surrounding pH is less than 3.0 or over 12.0. In contrast, it will become quite high when the pH is between 3.0 and 9.0. On the other hand, luminous position of Glu-FCN is very fixed. Optimal excitation and emission wavelengths are respectively located at 338 nm and 391 nm in a stable state. Importantly, good linear relationship exists between fluorescence intensity and concentration of Glu-FCN neutral aqueous solutions. The linear range is 0.20 - 50.0 μg/mL, with 0.20 μg/mL limitation. Eventually, quantum yields of Glu-FCN have been determined using quinine sulfate as a reference under different excitations. And Glu-FCN quantum yield is concluded to be as high as 51.5% under the optimal excitation (338 nm), implying its feasibility for being a fluorescent marker.
文章引用: 郑楠楠 , 楚险峰 , 潘立志 , 毕森林 , 丁 莎 , 周兴平 (2016) 谷氨酸钠碳纳米颗粒的荧光光谱及量子产率测定。 物理化学进展， 5， 75-82. doi: 10.12677/JAPC.2016.53008
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