摘要
采用乙酰丙酮铜为原料,通过金属有机物化学气相沉积大批量制备C/Cu壳/核纳米颗粒,并通过反应气氛调控C壳层的厚度。将C/Cu壳/核纳米颗粒在1 300℃的真空环境中退火,获得空心碳纳米球。通过透射电子显微镜、X射线衍射仪、拉曼光谱等表征手段,对退火前和退火后的样品进行对比分析,发现退火前和退火后的碳壳层的直径、厚度和石墨化程度都没有明显改变,但是样品的比表面积增大了一个数量级。因此,通过C/Cu壳/核纳米颗粒的真空退火,是实现空心碳球可控制备的一条简易途径。
Cu/C core/shell nanoparticles were synthesized by metal organic chemical vapor deposition using cupric acetylacetonate as precursor. The thickness and diameter of the as-synthesized core/shell nanoparticles were controlled by the reaction atmosphere. Hollow C nanospheres were obtained by annealing the as-synthesized core/shell nanoparticles at 1300 ℃ in vacuum. The analysis results from transmission electron microscope, X-ray diffraction, Raman spectrometer and specific surface area analyzer show that the diameter, thickness and crystaUinity of the as-obtained hollow C nanoshperes are similar to those of the C shells of Cu/C core/shell nanoparticles, while the specific surface area increases by an order of magnitude. The results demonstrate that annealing Cu/C core/shell nanoparticles in vauum is a simple route for the controllable fabrication of hollow C nanospheres.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2015年第2期225-229,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(50804057
51074188)
关键词
化学气相沉积
碳
空心纳米球
真空退火
Chemical vapor deposition
carbon
hollow nanosphere
annealing
