氢化碳纳米球的铁磁性分析
Ferromagnetic Analysis of Hydrogenated Carbon Nanospheres
作者单位E-mail
刘浩 吉林大学机械与航空航天工程学院, 长春 130012  
赵丁选 燕山大学机械工程学院, 秦皇岛 066044 zdx-yw@ysu.edu.com 
巩国栋 吉林大学物理学院, 长春 130012  
摘要: 为了研究球形碳结构的铁磁性的起源问题,以单质钠(Na)为还原剂,以三氯甲烷为原料,通过溶剂热合成法,分别在80、120℃下制备出2种氢化碳纳米球(HCNSs)并进行了系统表征。SEM图像表明:80℃下合成的HCNSs,其平均粒径为150 nm;而在120℃下合成的HCNSs平均粒径为300 nm,且碳球的分散性更佳。TEM图像表明,2种氢化碳纳米球皆为洋葱状类石墨结构,石墨层以波浪状分布在碳球的曲面上。从X射线光电子能谱可以看出:80℃ HCNSs的氢化程度更高,同元素分析的结果一致。红外光谱(IR)表明,2种碳纳米球的碳氢键含量较低。拉曼光谱表明HCNSs具有较高的无序度和较差的结晶性。室温条件下对HCNSs进行了磁性表征,结果表明2种HCNSs均具有铁磁性。高浓度缺陷与波浪状排布的石墨层所导致的负高斯曲率是HCNSs具有铁磁性的主要原因。
关键词: 氢化碳纳米球  形貌  无序度  氢化  铁磁性
基金项目: 国家高技术研究发展计划(863计划)项目(No.2009AA044403)资助
Abstract: In order to study the origin of ferromagnetism of spherical carbon structure, we prepared two kinds of hydrogenated carbon nanospheres(HCNSs) by solvothermal synthesis at 80 and 120℃, respectively, using Na as reducing agent and chloroform as raw material. Then we performed systematic characterization on them. According to SEM images, we found that the average particle size of HCNSs synthesized at 80℃ was 150 nm, while the average particle size of HCNSs synthesized at 120℃ was 300 nm, and the dispersion of the latter is better than that of the former. The TEM images showed that both hydrogenated carbon nanospheres were in the form of onion-like graphite, and the graphite layer was distributed in a wave shape on the curved surface of the carbon sphere. It can be seen from the X-ray photoelectron spectroscopy that the degree of hydrogenation of the hydrogenated carbon nanospheres at 80℃ is higher, which is consistent with the results of elemental analysis. The infrared spectroscopy (IR) of the HCNSs indicates that the two nanospheres have relative low carbon-hydrogen bond content. The Raman spectra of the HCNSs indicates that the obtained HCNSs have high degree of disorder and poor crystallinity. We magnetically characterized the HCNSs at room temperature, and the results show that both the HCNSs have ferromagnetism. The negative Gaussian curvature caused by wavy graphite layers and high concentration defects are the main reason for the ferromagnetism of HCNSs.
Keywords: hydrogenated carbon nanospheres  morphology features  degree of disorder  hydrogenation ferromagnetic
投稿时间:2019-01-22 修订日期:2019-04-20
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刘浩,赵丁选,巩国栋.氢化碳纳米球的铁磁性分析[J].无机化学学报,2019,35(7):1188-1194.
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