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

doi:10.7503/cjcu20180638

Abstract

Abstract:

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.

Key words: Fluorescent nanofiber containing carbon dot, Electrospinning, Biomedical material, Organosilane, Hydrothermal synthesis method

CLC Number:

O631

TrendMD:

GAO Ningxiao,XU Yulong,LIU Yong. Preparation of Carbon Dots from Soy Milk Powder and Fluorescent Nanofibers Containing Carbon Dots^†[J]. Chem. J. Chinese Universities, 2019, 40(3): 555.

Figures/Tables 7

Scheme 1 Preparation process of carbon dots and carbon dots fibers

Scheme 2 Pattern(written with the carbon dots solution as ink) and carbon dots fiber showing cyan fluorescence under UV light

Fig.1 UV-Vis absorption spectrum of carbon dots solution prepared at 150 ℃

Fig.2 Fluorescence excitation spectra of carbon dots solutions prepared at different temperaturea. 150 ℃; b. 160 ℃; c. 170 ℃.

Fig.3 Emission spectra of CDs solutions prepared at 150 ℃(A), 160 ℃(B) and 170 ℃(C) at different excitation wavelengths

Fig.4 SEM images of the electrospun fibers obtained from the carbon dots solutions prepared at 150 ℃(A), 160 ℃(B) and 170 ℃(C)

Table 1 Average diameters and standard deviations of carbon dots fibers

Prepare temperature/℃	Average diameter/nm	Standard deviation
150	432.1	0. 0542
160	556.4	0. 1211
170	320. 7	0. 0534

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