宏观超长定向碳纳米管阵列的制备

采用二甲苯和二茂铁作为碳源和催化剂的化学气相沉积法连续制备定向碳纳米管阵列,在反应6h内获得长度为6mm的宏观定向碳纳米管阵列。当反应时间超过6h后,定向碳纳米管阵列的生长速度明显下降,并有停止生长的趋势,反应16h,定向碳纳米管阵列的厚度仅为6．7mm。本文研究了采用多次连续进给碳源和催化剂的方式制备定向碳纳米管阵列,成功的制备了8．9mm厚的定向碳纳米管阵列,阵列中的碳纳米管具有高的定向性和良好的界面结合。     

阵列式碳纳米管研究进展

阵列式碳纳米管(Aligned Carbon Nanotubes or ANTs)是指碳纳米管垂直于基底生长形成的碳纳米管阵列,在场发射管和生物传感器等领域具有潜在应用价值.介绍了阵列式碳纳米管的主要制备方法和应用.     

树状取向碳纳米管阵列的制备

采用在Ar气氛保护下裂解FePc制备出一种树状取向碳纳米管阵列(ACNTA),这种种特殊结构是由ACNTA裂缝自组装而成.在生长过程中裂缝处能获得更多的催化剂和碳源,因此自身能够持续发展,且裂缝以60°或120°夹角再次分裂,最终形成树状结构.     

碳纳米管阵列制备及结构与光学特性研究

以乙烯为碳源,铁为催化剂,通过调节碳源气体的供给时间来控制碳纳米管阵列的生长过程,最终在负载有催化剂膜层的硅基底上生长出不同高度的碳纳米管阵列,经sEM、TEM、激光拉曼和紫外-可见-近红外分光光度计对其结构和特性进行分析,结果表明,碳纳米管阵列在300nm-2000nm范围可以达到小于0．238％的超低反射率,不同结构和高度的碳纳米管阵列表现出不同的紫外-可见-近红外反射特性。     

定向生长碳纳米管阵列的制备及其应用研究进展

碳纳米管在力、热、光、电等方面都显示出独特的性质，受到众多领域专家的广泛关注，而定向生长的碳纳米管阵列的获得具有更深远的科学意义。详细介绍了国内外定向生长碳纳米管阵列的制备方法，重点阐述了化学气相沉积法（CVD）的制备流程和生长机理以及其工艺参数对生成碳管阵列的影响。简要论述了碳纳米管阵列在几个典型应用领域的研究进展。     

碳纳米管阵列/热解炭复合材料的制备和表征（英文）

以甲烷为碳源,通过化学气相沉积和化学蒸汽渗透两步法将热解炭填充至碳纳米管阵列间的空隙而制备出碳纳米管阵列/热解炭复合材料。采用扫描电镜和拉曼光谱仪对样品的结构进行表征。结果表明,碳纳米管被热解炭填充和覆盖形成均相的复合膜,其密度增加4倍,同时热解炭已石墨化。     

定向生长碳纳米管阵列的制备及其应用研究进展

碳纳米管在力、热、光、电等方面都显示出独特的性质,受到众多领域专家的广泛关注,而定向生长的碳纳米管阵列的获得具有更深远的科学意义.详细介绍了国内外定向生长碳纳米管阵列的制备方法,重点阐述了化学气相沉积法(CVD)的制备流程和生长机理以及其工艺参数对生成碳管阵列的影响.简要论述了碳纳米管阵列在几个典型应用领域的研究进展.     

无氢化学气相沉积法制备碳纳米管

采用无氢的化学气相沉积法（CVD）进行碳纳米管的制备技术研究,并成功地制备了由20—φ80nm左右,长度为50-100μm左右的碳纳米管。通过改变气体的流量等影响因素实现了定向碳纳米管薄膜和多层碳纳米管薄膜以及其它各种形态的碳纳米管的制备。采用微区Raman光谱、扫描电子显微镜（SEM）和透射电子显微镜（TEM）等方法对产物的形貌和结构进行了表征,结果表明采用无氢CVD法可以制备出多种形态的碳纳米管。     

以乙二胺为促进剂在碳纤维表面生长定向碳纳米管阵列

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。     

定向碳纳米管薄膜的制备研究

采用化学气相沉积法制备了定向碳纳米管薄膜,研究了向反应室载入水、氨水对定向碳纳米管薄膜的影响,并用SEM、TEM、XRD对碳纳米管进行了表征。结果表明：向反应室载入水的量增大,定向碳纳米管的长度先增加后减小。载入水的氩气流量为400ml／min,定向碳纳米管的长度1750μm;向反应室载入氨水,得到疏密相间排列的定向碳纳米管薄膜,氨水量增加,定向碳纳米管薄膜的厚度减小。     

Preparation of Co-Ni Oxide/Vertically Aligned Carbon Nanotube and Their Electrochemical Performance in Supercapacitors

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.     

Tuning Array Morphology for High‐Strength Carbon‐Nanotube Fibers

Vertically aligned carbon‐nanotube arrays are synthesized by chemical vapor deposition. Carbon‐nanotube fibers are directly spun from the obtained nanotube arrays and then tested mechanically. A strong correlation between the array morphologies and the mechanical properties of the fibers is observed: well‐aligned arrays yield fibers with much higher performance, while wavy and entangled arrays give poor fiber properties. More importantly, such array morphologies could be controlled by introducing hydrogen or oxygen during the nanotube synthesis. By simply switching the growth condition from 150 ppm oxygen addition to 2% hydrogen addition, the nanotube array changes from the wavy morphology to the well‐aligned morphology, and correspondingly the tensile strength of the resultant fibers could be increased by 4.5 times, from 0.29 GPa for the fibers spun from the oxygen‐assistance‐grown nanotube arrays to 1.3 GPa for the fibers spun from the hydrogen‐assistance‐grown nanotube arrays. The detailed effects of hydrogen and oxygen on the nanotube growth, especially on the growth rate and the array spinnability, are extensively studied. The formation mechanism of the different morphologies of the nanotube arrays and the failure mechanism of the nanotube fibers are also discussed in detail.     

改变基底合成不同形貌碳纳米管宏观结构

采用化学气相沉积法,选用不同基底和表面涂层合成了碳纳米管垂直阵列薄膜、管束和条带三种碳纳米管宏观结构,并用扫描电镜（SEM）和透射电镜（TEM）进行了表征。结果表明：在石英涂层上合成的定向碳纳米管薄膜厚度达毫米级;在表面有Al2O3涂层的不锈钢基底上可合成碳纳米管垂直阵列薄膜和不同尺寸宏观管束结构;在表面有SiO2涂层...     

无基底阵列式碳纳米管膜

介绍了一种廉价、简单易行的将阵列式排列的碳纳米管从石英基底上完整地剥离下来,从而得到无基底阵列式碳纳米管膜的方法。比较了生长基底对膜转移的影响。结果表明用抛光石英玻璃生长的阵列式碳纳米管膜转移到Al基底上的转移效率为80％,而普通石英玻璃上生长的碳纳米管膜转移到Al基底上的转移率为20％。去除基底后阵列式碳纳米管的电阻值表现出各向异性。     

Perforated Carbon Nanotube Film Assisted Growth of Uniform Monolayer MoS2 (Small 23/2023)

Scaling up the chemical vapor deposition (CVD) of monolayer transition metal dichalcogenides (TMDCs) is in high demand for practical applications. However, for CVD-grown TMDCs on a large scale, there are many existing factors that result in their poor uniformity. In particular, gas flow, which usually leads to inhomogeneous distributions of precursor concentrations, has yet to be well controlled. In this work, the growth of uniform monolayer MoS₂ on a large scale by the delicate control of gas flows of precursors, which is realized by vertically aligning a well-designed perforated carbon nanotube (p-CNT) film face-to-face with the substrate in a horizontal tube furnace, is achieved. The p-CNT film releases gaseous Mo precursor from the solid part and allows S vapor to pass through the hollow part, resulting in uniform distributions of both gas flow rate and precursor concentrations near the substrate. Simulation results further verify that the well-designed p-CNT film guarantees a steady gas flow and a uniform spatial distribution of precursors. Consequently, the as-grown monolayer MoS₂ shows quite good uniformity in geometry, density, structure, and electrical properties. This work provides a universal pathway for the synthesis of large-scale uniform monolayer TMDCs, and will advance their applications in high-performance electronic devices.