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碳纳米管(CNTs)是一种具有独特理化性能和结构的一维纳米材料,也是当今纳米材料研究的焦点之一.在化学、生物、医药、能源、电子元件等诸多领域具有极高的应用价值.本文以有机溶剂环己烷为碳源.利用化学气相沉积法(CⅥ))在管式电阻炉内,以氩气为栽气,二茂铁为催化剂,一定温度条件下,制备了直径约为50nm,长度达几十微米以上的多壁碳纳米管(MWNTs).采用拉曼光谱、扫描电镜、透射电镜、X-射线粉末衍射等测试手段,表征了碳纳米管的微观形貌和结构特征.通过对实验结果的分析和讨论,对CVD制备法中碳纳米管的生长机理进行了尝试性探讨。 相似文献
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本文概述了碳纳米管的结构性能及制备技术 ,并介绍了目前有关碳纳米材料特别是碳纳米管储氢的理论与实验上的研究进展 相似文献
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本文概述了碳纳米管的结构性能及制备技术,并介绍了目前有关碳纳米材料特别是碳纳米管储氢的理论与实验上的研究进展。 相似文献
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含碳纳米管的聚合物复合材料研究进展 总被引:5,自引:0,他引:5
介绍了近年来含碳纳米管的聚合物复合材料的研究状况,对直接共混法、原位聚合法和溶胶-凝胶法三种制备含碳纳米管聚合物复合材料的工艺进行了比较分析,指出了含碳纳米管聚合物复合材料研究中面临的一些问题,并探讨了该类复合材料的发展方向。 相似文献
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碳源对碳纳米管形态的影响 总被引:7,自引:7,他引:0
以苯和甲苯为碳源,二茂铁为催化剂,含硫化合物为助催化剂,采用浮游催化裂解法制备了碳纳米管,并采用TEM对不同条件下所得碳纳米管进行了形态分析。结果发现,碳源中苯和甲苯的配比对碳纳米管的形态有着重要的影响。以纯苯为碳源时,产物主要为直线型碳纳米管,并存在极少量短的弯曲型碳纳米管。随着碳源中甲苯比例的增加,产物中折线型碳纳米管增加。以纯甲苯为碳源,产物中仍有少量直线型碳纳米管,而不完全是折线型碳纳米管;此外,产物中还发现了极少量分支型碳纳米管。根据所得结果讨论分析了甲苯的加入对碳纳米管形态的影响以及各种碳纳米管的形成机理,认为可能是由于甲苯在催化热解过程中产生的碳种不同于苯催化热解所产生的碳种,造成碳在催化剂颗粒各处浓度不同,从而在碳纳米管的不同部位引入五元环和七元环而形成各种形态的碳纳米管。 相似文献
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《Composites Science and Technology》2007,67(15-16):3041-3050
Functionalization with different amino groups of multi-walled carbon nanotubes was achieved and nanotube-reinforced epoxy nanocomposites were prepared by mixing amino-functionalized multi-walled carbon nanotubes with epoxy resin. Differential scanning calorimetry, thermogravimetric analysis and bending tests were used to investigate the thermal and mechanical properties of the nanocomposites. The results showed that different kinds of amino-functionalized multi-walled carbon nanotubes would have different effects on the thermal and mechanical properties of the nanocomposites. The reinforcement mechanism of amino-functionalized multi-walled carbon nanotubes in epoxy resin was discussed. 相似文献
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Straight carbon nanotubes, carbon nanotube “knees,” Y-branches of carbon nanotubes and coiled carbon nanotubes were grown on a graphite substrate held at room temperature by the decomposition of fullerene under moderate heating (450 °C) in the presence of 200-nm Ni particles. The grown structures were investigated without any further manipulation by STM. The growth and the chemical stability of the carbon nanostructures containing nonhexagonal rings are discussed. 相似文献
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堇青石载镍催化剂对燃烧合成碳纳米管的影响 总被引:1,自引:0,他引:1
借助于硝酸镍溶液, 利用浸渍法在堇青石表面均匀负载镍催化剂颗粒, 在甲烷扩散火焰中活化并催化生成碳纳米 管. 实验结果表明, 生成的多壁碳纳米管直径为30~50nm, 长度约为十几微米, 空腔比较小, 管壁石墨结晶结构良好.提高浸渍液浓度, 催化剂颗粒尺寸明显变大, 但对碳纳米管的形态影响比较小. 延长浸渍时间, 可使催化剂颗粒密度提高, 碳纳米管出现成束生长现象. 结合碳管成核生长过程和火焰燃烧的特点, 探讨了催化剂对于碳纳米管生长的影响机制. 相似文献
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本文讨论了有关纳米碳管制备的方法及工艺要求 ,同时介绍了在纳米碳管制备上的新进展和发展趋势 相似文献
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Oxidatively shortened single-walled and multiwalled carbon nanotubes were characterized by using flow field-flow fractionation (FIFFF) under normal and steric modes, respectively. Narrow size fractions were collected from FlFFF separations. The carbon nanotubes in each fraction were further characterized by using scanning and transmission electron microscopy. FlFFF separates carbon nanotubes principally on the basis of length, leading to fractions with relatively uniform lengths. The relationship between nanotube length and FlFFF elution volume is discussed. 相似文献
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Xuguang Liu Yongzhen Yang Hongyan Liu Weiyun Ji Chunyi Zhang Bingshe Xu 《Materials Letters》2007,61(18):3916-3919
High purity and uniform carbon nanotubes with about 35 nm in diameter were produced by pyrolysis of deoiled asphalt in the presence of ferrocene in an atmosphere of hydrogen and argon at 1000 °C. Characterization of carbon nanotubes was carried out by field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), X-ray energy dispersive spectroscopy (EDS), Raman spectroscopy and X-ray diffraction (XRD). The carbon nanotubes were highly graphitized with amorphous carbons covering the outside wall. The influence of temperature on the preparation of carbon nanotubes was also discussed. 相似文献