Preparation And Characterizations Of Amorphous Carbon Nanoparticles

Amorphous carbon nanoparticles exhibit potential applications in bioimaging, photocatalysis and bio-sensing for their photo-luminescent properties, biocompatibility and nontoxic characteristics. In this dissertation, we focus on the preparation,characterizations, and properties of amorphous carbon nanoparticles. The main contents are as follows:(1) Disperse spherical amorphous carbon nanoparticles with a small particle size and narrow particle size distribution were synthesized via hydrothermal oxidation of glucose. The compositions of amorphous carbon nanoparticles were characterized by Energy dispersive spectrometer, Fourier transform infrared spectroscopy, and Raman spectra. The EDS results show that the obtained samples were mainly consisted of C and 0 elements, and the results of FTIR and Raman demonstrate that there are carboxyl and hydroxyl oxygen-containing functional groups in the samples. Based on the XRD and SAED analyses, the obtained samples were amorphous. In summary, the samples obtained were amorphous carbon nanoparticles.(2) According to the TEM results, the prepared samples are spherical and well dispersed. The major factors taking effects on the preparation of amorphous carbon nanoparticles were studied. Such as reaction temperature, reaction time, and concentration of glucose solution. The size of amorphous carbon nanoparticles obtained decreases with increasing the reaction temperature (160℃-190℃). The sample crystallizes when the temperature reaches 200℃. The size of amorphous carbon nanoparticles obtained decreases with increasing the reaction time (3-5 h). Large size agglomerations were observed when the reaction time reaches 6 h. The size of amorphous carbon nanoparticles obtained decreases with increasing the concentration of glucose solution (0.05-0.15 mol/L). Large size agglomerations were observed when the concentration of glucose solution reaches 0.2 mol/L. Finally, the optimal experimental conditions are obtained by contrastive analyses of the experiments.(3) UV-Vis analyses shows that the electronic structure of the prepared amorphous carbon nanoparticles were similar to that of the organic light-emitting material.