Study on Photoluminescence Characteristics of Carbon Dots in Different Ligands
Carbon dots are widely used in various fields especially in the field of photoluminescence due to their adjustable optical properties and good optical stability.The photoluminescence of carbon dots is closely related to the molecular structure of carbon sources,in which the dispersion of carbon dots affects their luminescence intensity.In order to study the photoluminescence properties of carbon dots in different ligands,carbon dots NCDs,NSCDs and NCDs+NSCDs were prepared by doping synthesis and solution dialysis,the morphologies of the three carbon dots were observed by scanning electron microscopy,transmission electron microscopy,and X-ray diffraction.The light absorption intensity of the three carbon dots was measured by UV-vis.The dispersion and luminescence properties of the three carbon points were also studied.The results show that the morphology of carbon dots NCDs is two-dimensional fine sheet,the heteroatoms of carbon dots NSCDs are loaded on its surface,and the doped atomic groups of carbon dots NCDs+NSCDs have strong monodispersion.The three carbon dots are uniformly distributed as nanoparticles with a size of about 1.8 nm.Taking the carbon characteristic peak of NCDs as the initial position reference,the characteristic peak of NSCDs has obviously shifted to the left,and the characteristic peak of NCDs+NSCDs also shifted to the left,but it is not as obvious as NSCDs.This is because the introduction of doping atomic groups changes the crystal face spacing,thus affecting the size of the crystal face spacing of carbon dots,which shows that doping atoms have been introduced into the carbon dots.The three carbon dots all emit green fluorescence under natural light,and tend to shift to blue with the longer excitation wavelength,among which the mixed carbon dots have the deepest fluorescence color,indicating that the carbon dots of NCDs+NSCDs have stronger hydrophilicity and dispersion,and the enhancement of dispersion will enhance the luminous intensity of carbon dots.The emission intensity of NCDs+NSCDs carbon dots in different ligands is the strongest,indicating that its dispersion is enhanced,thus enhancing its photoluminescence performance.As a new generation of carbon materials,carbon dots have promoted the development of various fields and further understanding of carbon materials.
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