(1. 廣東工業(yè)大學(xué) 材料與能源學(xué)院，廣州 510006；
2. 廣東工業(yè)大學(xué) 實(shí)驗(yàn)教學(xué)部，廣州 510006)
摘 要: 以碳粉和銅粉為原料，碳粉和銅粉的質(zhì)量比分別為4׃1、3׃2、2׃3、1׃4時(shí)，采用碳弧法制備4種碳包覆納米銅粒子；采用X射線衍射(XRD)、透射電子顯微鏡(TEM)、熱重分析(TGA)和差示掃描量熱法(DSC)對(duì)樣品的物相結(jié)構(gòu)組成、形貌、尺寸、相組成以及抗氧化性能進(jìn)行研究；并對(duì)影響碳包覆納米銅粒子粒徑以及制備速率的因素進(jìn)行研究。結(jié)果表明：碳包覆納米銅粒子具有典型的核殼型結(jié)構(gòu)，內(nèi)核為面心立方的金屬銅，外殼為石墨碳層；碳包覆銅納米顆粒的粒徑為20~60 nm，粒徑隨著樣品電極中的金屬銅含量、放電電流、反應(yīng)氣壓的增加而增大；隨著樣品電極中金屬銅含量的增加以及放電電流的增大，碳包覆納米銅粒子的制備速率加快，而反應(yīng)氣壓對(duì)制備速率沒有明顯的影響；隨著銅含量的增加，內(nèi)部銅核具有進(jìn)一步晶化的趨向，銅對(duì)外層碳層的石墨化具有催化作用，銅含量越高碳的石墨化程度越明顯；外面的碳層能有效阻止內(nèi)核的納米銅粒子的氧化，碳包覆納米銅粒子比純銅粉末表現(xiàn)出更好的抗氧化性能。
關(guān)鍵字: 碳；納米銅粒子；包覆；碳弧法; 抗氧化性能
carbon-coated copper nanoparticles
（1. Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;
2. Equipment and Lab Manngement Division, Guangdong University of Technology, Guangzhou 510006, China）
Abstract:Four different kinds of carbon-coated copper nanoparticles were synthesized by carbon arc discharge method using powder mixtures containing copper and graphite with mass ratios of graphite to copper of 4׃1, 3׃2, 2׃3, 1׃4, respectively. The structures, topographies, size distributions, phase compositions and anti-oxidation properties of those nanoparticles were characterized by X-ray diffratometry(XRD), transmission electron microscopy(TEM), thermogravimetric analysis(TGA) and differential scanning calorimety(DSC), respectively. And the factors influencing the particles size and the yield of carbon coated copper nanoparticles were also discussed. The results indicate that the carbon-coated copper nanoparticles show clear core-shell structure, the cores of the particles are copper, and shells of the particles are graphite carbon layers. The sizes of carbon coated copper nanoparticles are 20−60 nm, and the sizes of nanoparticles increase with increasing the copper content in sample electrode, meanwhile, the particles sizes increase accompanying the increase of the discharge current and reaction pressure. The yield of carbon coated-copper nanoparticles increases with the increase of the copper content, while reaction gas pressure has no significant effect on the yield. And with the increase of copper content, the inner copper core has a trend of further crystallization. Copper possesses catalysis to the external carbon layers, and the graphitization degree becomes more obvious as the content of copper increases. The outside graphitic carbon layers effectively prevent unwanted oxidation of the copper inside. The anti-oxidation property of carbon-coated copper nanoparticles is superior to that of the pure copper powder.
Key words: carbon; copper nanoparticle; coating; carbon arc discharge; anti-oxidation property
