超细Ni-C核-壳纳米颗粒的制备及其磁学和微波吸收性能  

Synthesis,magnetic and microwave absorption properties of extremely Ni-C core-shell nanoparticles

作　　者：邝代涛 文祥 梁冰冰[1] 侯丽珍[2] 马松山[1] 王世良[1] KUANG Daitao;WEN Xiang;LIANG Bingbing;HOU Lizhen;MA Songshan;WANG Shiliang(School of Physics and Electronics,Central South University,Changsha 410081,China;School of Physics and Information Science,Hunan Normal University,Changsha 410081,China)

机构地区：[1]中南大学物理与电子学院,长沙410083 [2]湖南师范大学物理与信息科学学院,长沙410081

出　　处：《粉末冶金材料科学与工程》2018年第2期180-185,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51074188;11502080)

摘　　要：以乙酰酮丙镍为原料,通过金属有机物化学气相沉积,合成超细Ni-C核-壳纳米颗粒。采用XRD、Raman光谱仪、TEM和多功能物理测试系统对合成的纳米颗粒的物相、结构和磁学性能进行表征。这种超细纳米颗粒外表包覆一层厚度1~3 nm的C层,内部Ni核的平均粒径为13 nm。磁学测试表明,超细Ni-C核-壳纳米颗粒的饱和磁矩为24.5 emu/g,矫顽力为65.5 Oe,远低于直径超过20 nm的Ni-C核-壳纳米颗粒的对应值。微波吸收测试表明,超细Ni-C核-壳纳米颗粒和石蜡的混合物的最小反射损失值(RL_(min))为-48.7 d B,有效带宽(BW_(eff),RL≤-10dB)为7.4 GHz,是一种非常具有潜力的微波吸收材料。Ultra-small Ni-C core-shell nanoparticles were synthesized by the metal organic chemical vapor deposition(MOCVD)using Ni(acac)2 as precursor.The structure and magnetic properties of the as-synthesized nanoparticles were characterized by XRD,Raman spectroscopy,TEM and Physical Property Measurement System respectively.The Ni nanocores have an average diameter of 13 nm,and are encapsulated by C shells with the thickness of 1-3 nm.The Ni-C core-shell nanoparticles have a saturation magnetic moment of 24.5 emu/g,coercivity of 65.5 Oe which is much smaller than the corresponding values of bulk Ni and Ni-C core-shell nanoparticles which are 20 nm in diameters.In the microwave absorption tests,a low reflection loss(RL)of-48.7 dB and a large effective bandwidth(frequency range for RL≤-10 dB)of 7.4 GHz are obtained from the composites of small Ni-C core-shell nanoparticles and paraffin.This suggests that the as-synthesized ultra-small Co-C core-shell nanoparticles have a high potential as the microwaveabsor

关 键 词：镍 碳 核壳纳米颗粒 金属有机物学气相沉积法 磁性 微波吸收 

分 类 号：TB33[一般工业技术—材料科学与工程]