Controllable Fabrication And Performance Characterization Of Cu/C Core/shell Nanoparticles And Hollow Carbon Nanospheres

:In this thesis Cu/C core/shell nanoparticles were synthesized with large quantities by metal-organic chemical vapor deposition (MOCVD) using Cupric(Ⅱ) acetylacetonate as carbon sources. Our research found that diameters of the particle and thickness and crystallinity of carbon shell could be adjusted by changing the reaction temperature and the flowing of hydrogen. After the annealing of Cu/C core/shell nanoparticles in the vacuum, hollow carbon nanospheres could be obtained. Structures and properties of Cu/C core/shell nanoparticles synthesized at different conditions and hollow carbon nanospheres were characterized using XRD, Raman, SEM, TEM, TGA, BET surface area analysis, PL and UV.In the last part of this thesis, we introduced the applications based on our synthesized materials, hollow carbon nanospheres, such as, electrode materials in supercapacitor. Research works are as follows:(1) Influence of deposition temperature and flowing of hydrogen to final products was studied by changing the temperature from600,700,800and900℃and setting the flowing to50,200and500ml/min. Results indicated that diameters of copper core, thickness of carbon shell and its graphitizing degree (R) could be varied from15nm-20nm,1.5nm-8nm and0.74-1.64, respectively. When the temperature was800℃with flowing rate of200ml/min, deposited products were with the smallest diameter of the copper core (15nm) and the thickest carbon shell (8nm).(2) Optical properties of Cu/C core/shell nanoparticles under different conditions were studied based on the diameter of copper core, the thickness and graphitizing degree of carbon shell,which could arouse the change of SPR and PL of the nanoparticles.(3) Cu/C core/shell could be synthesized with the selectivity in different atmosphere. After the annealing in vacuum, final products were hollow carbon nanospheres. Research reported that surface area was Increased by one order of magnitude after the treatment.(4) Elementary study on the properties of hollow carbon nanospheres as electrode materals in supercapacitor were conducted.