豆奶粉提取碳点及含碳点荧光纳米纤维的制备

Preparation of Carbon Dots from Soy Milk Powder and Fluorescent Nanofibers Containing Carbon Dots

以豆奶粉为碳源,以有机硅烷为钝化剂,用水热合成法制备碳点,采用静电纺丝技术,以碳点与聚乙烯吡咯烷酮(PVP)共混溶液为纺丝液,制备了含碳点的纳米纤维.通过紫外吸收光谱、荧光吸收光谱和荧光发射光谱表征了碳点性质.结果显示,所得碳点纳米纤维直径分布均匀,形貌良好,碳点分散溶液在340～540 nm的紫外光激发下发出强青绿色荧光,荧光发射峰出现在550 nm处,并且随着激发波长增加有微弱的红移.

Carbon dots were prepared by using hydrothermal synthesis method with soy milk powder as the carbon source and organosilane as a passivating agent. Electrospinning technology was adopted using carbon dot and polyvinyl pyrrolidone(PVP) blending solution as the spinning solution to prepare nanofibers containing carbon dots. The properties of the carbon dots were characterized by ultraviolet absorption spectroscopy, fluorescence absorption spectroscopy, and fluorescence emission spectroscopy. The results showed that the carbon dot dispersion solution extracted from soy milk powder emitted strong cyan fluorescence under the excitation of 340-540 nm ultraviolet light. The fluorescence emission peak appeared at 550 nm and there was a weak redshift with the increase of excitation wavelength. The obtained carbon-containing nanofibers have a uniform diameter distribution, good morphology, and retain excellent fluorescence properties.