共查询到20条相似文献,搜索用时 9 毫秒
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在金属基底上,以铁为催化剂,硅做过镀层,乙烯为源气体,通过普通的化学气相沉积方法生长出垂直基底排列的碳纳米管(CNT)阵列.扫描电子显微镜和透射电镜观察表明,生长的CNT具有阵列形貌和多缺陷的结构.对CNT阵列的场发射性质进行了测量,在10 μA/cm2时不锈钢和镍基底上的开启电场分别为1.25 V/μm 和1.57 V/μm. 相似文献
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A Co-Ni oxide/vertically aligned carbon nanotube (VACNT) composite was prepared by thermal decomposition of cobalt-nickel nitrate precursor on the surface of VACNT electrode. VACNTs were used as 3D nanoporous substrate and were grown by plasma-enhanced chemical vapor deposition from a mixture of H2 and C2H2. The specific capacitance of Co-Ni oxide (5:5)/VACNT (with equal Co+2/Ni+2 mole ratio) was measured to be 1050 Fg?1, which is about 1.9- and 3-fold that of Ni oxide/VACNT (540 Fg?1) and Co oxide/VACNT (341 Fg?1), respectively. The results show Co-Ni oxide (5:5)/VACNT composite electrode has excellent specific capacitance because of porous network structure, good electrical conduction pathways, high access for the electrolyte solution, and consequently increased composite/solution interfacial contact area. The capacitance property of the Co-Ni oxide/VACNT composite electrode with different Co+2/Ni+2 mole ratios was also investigated and the highest specific capacitance is achieved at equal Co+2/Ni+2 mole ratio. 相似文献
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采用注射化学气相沉积(Chemical vapor deposition,CVD),以乙二胺(Ethylenediamine,EDA)为促进剂,在未涂覆无机陶瓷涂层的碳纤维表面直接生长了定向碳纳米管(Carbon nanotubers,CNTs)阵列。研究表明:碳纤维表面的定向CNTs沿纤维轴向呈对称分布,生长密度约为5×109 tubes/cm2,长度可达18μm。定向CNTs具有多壁、竹节状结构,平均直径约为37nm。EDA对CNTs的生长形貌影响显著,是CNTs在碳纤维表面定向生长的关键。 相似文献
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J. Chen A. I. Minett Y. Liu C. Lynam P. Sherrell C. Wang G. G. Wallace 《Advanced materials (Deerfield Beach, Fla.)》2008,20(3):566-570
Entangled networks of multiwalled carbon nanotubes (CNTs) integrated into a highly conducting carbon layer can be grown on a range of substrates including glassy carbon and metal foils. On p. 566, Gordon Wallace and co‐workers report the fabrication of a continuous flexible CNT electrode with high surface area and conductivity. The electrode demonstrates a stable battery capacity of 572 mAh g–1. This discovery provides a direct route for the generation of large‐scale flexible CNT electrode materials. 相似文献
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Several characterization methods have been developed to investigate the mechanical and structural properties of vertically aligned carbon nanotubes (VACNTs).Establishing analytical models at nanoscale to interpret these properties is complicated due to the nonuniformity and irregularity in quality of as-grown samples.In this paper,we propose a new methodology to investigate the correlation between indentation resistance of multi-wall carbon nanotube (MWCNT) turfs,Raman spectra and the geometrical properties of the turf structure using adaptive neuro-fuzzy phenomenological modeling.This methodology yields a novel approach for modeling at the nanoscale by evaluating the effect of structural morphologies on nanomaterial properties using Raman spectroscopy. 相似文献
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定向碳纳米管阵列在石英玻璃基底上的模板化生长研究 总被引:5,自引:0,他引:5
分别以带有刻痕的石英玻璃和溅射过Au膜的石英玻璃为生长基底,通过催化裂解二茂铁和二甲苯混合物的方法,在基底上制备出了模板化的定向碳纳米管(CNT)阵列,扫描电镜(SEM)和透射电镜(TEM)观察表明:在这两种基底上生长的定向碳纳米管阵列的模板化程度都很高,其中的碳纳米管多为直径在20~50nm的多壁管(MWNT),且具有很好的定向性。本文还分析、对比了基底材料对定向碳纳米管生长的影响,初步探讨了定向碳纳米管模板化生长的形成机制。 相似文献
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《Fullerenes, Nanotubes and Carbon Nanostructures》2007,15(2):135-143
Fe-filled multi-wall carbon nanotubes (MWNTs) were produced by pyrolysis of ferrocene in a dual furnace system. They grew vertically aligned on oxidized silicon substrates placed inside the reaction zone of a chemical vapor deposition reactor. A variation of the growth parameters has been performed in order to evaluate the possibility to control the Fe-filled nanotube growth process and thereby the nanotube- and the filling length, diameter and yield, and also the nanotube alignment. Electron microscopy studies show nanotubes with quite different morphologies. The relation between the aligned Fe-filled MWNTs growth and the most important growth parameters is discussed. 相似文献
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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