(1. 蘭州理工大學(xué) 理學(xué)院，蘭州 730050； 2. 蘭州理工大學(xué) 省部共建有色金屬先進(jìn)加工與再利用國家重點(diǎn)實(shí)驗(yàn)室，蘭州 730050)
摘 要: 采用直流電弧放電等離子體技術(shù)制備碳包覆銅納米顆粒，并對樣品的形貌、晶體結(jié)構(gòu)、粒度、比表面積和孔結(jié)構(gòu)采用高分辨透射電子顯微鏡(HRTEM)、X射線衍射儀(XRD)和N2吸-脫附等測試手段進(jìn)行分析。結(jié)果表明：直流電弧等離子體技術(shù)制備的碳包覆銅納米顆粒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。顆粒主要呈球形或橢球形，粒度相對比較均勻，分散性良好，粒徑分布在20~100 nm范圍內(nèi)，平均粒徑為50 nm，外殼碳層的厚度為10 nm。碳包覆銅納米顆粒的等溫吸附曲線屬Ⅳ型，晶粒之間的孔隙以介孔為主，樣品的BET比表面積為33 m2/g，當(dāng)量粒徑為45 nm，與TEM和XRD測得的結(jié)果基本一致。BJH吸附累積總孔孔容與BJH吸附平均孔徑分別為0.112 cm3/g和13 nm。
關(guān)鍵字: 碳包覆；核殼結(jié)構(gòu)；氮吸附；比表面積；孔結(jié)構(gòu)
（1. School of Science, Lanzhou University of Technology, Lanzhou 730050, China; 2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China）
Abstract:Carbon encapsulated Cu nanoparticles were successfully prepared by DC arc discharging plasma technology. The product was characterized by X-ray diffractometry (XRD), high resolution transmission electron microscopy (HRTEM) and low-temperature N2 adsorption desorption to determine the morphology, crystal structure, particle size, specific area and pore structure. The results indicate that the carbon encapsulated copper nanoparticles have typical core shell structure, the core is metal face centered cubic structure copper, and the outer shell is graphite carbon layer. The particles morphology mainly exhibit spherical or ellipsoidal shapes with relatively uniform particle size and good dispersion. The particle size distribution is in the range of 20-100 nm, the average particle size is 50 nm, and the thickness of the shell carbon layer is about 10 nm. The N2 adsorption and desorption isotherm belongs to type Ⅳ, most of pores between grains are mesoporous pore, the BET specific surface area is 33 m2/g, and the equivalent particle size is 45 nm, which is consistent with the results measured by TEM and XRD. The BJH adsorption cumulative pore volume and adsorption average pore size are 0.112 cm3/g and 13 nm, respectively.
Key words: carbon-encapsulated; core-shell structure; nitrogen adsorption; specific surface area; pore structure
