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Growth mechanism and structural control of catalytically grown carbon nanotubes using nano-sized metal particles

使用纳米尺寸金属颗粒催化生长碳纳米管的生长机制和结构控制

基本信息

批准号：
16201024
负责人：
ENDO Morinobu
金额：
$ 29.29万
依托单位：
SHINSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

In this project, we successfully produced high purity carbon nanotubes in a catalytic chemical vapor deposition method through an exact understanding of the critical function of nano-sized metal particles during nanotube growth, and have carried out their structural characterizations.The summarized research results are as follows :(1) We have developed the method of synthesizing high purity double walled carbon nanotubes (DWNTs) through an understanding of long-discussed growth mechanism of carbon nanotubes in a catalytic chemical vapor deposition (CVD) method. Specifically, we have clarified the importance of supporting materials because their size and compositions directly contributed to the formation of nano-sized metal particles for growing carbon nanotubes.(2) We found that the reaction temperature of 850℃ was the optimum condition for preferentially growing thin DWNTs (ca. 0.8 nm) over single walled carbon nanotubes (SWNTs).(3) When DWNTs were thermally treated at 2000℃ in argon, … More the adjacent outer shells were structurally merged to form a coalesced nanostructure.(4) DWNT-derived buckypaper exhibited higher resistance to oxidation, and furthermore, had large fraction of nano-sized pores below 1 nm.(5) We demonstrate that the incorporation of boron (B) atoms between double walled carbon nanotubes (DWNTs) during thermal annealing (1400 -1600℃) results in covalent nanotube "Y" junctions, DWNT coalescence and the formation of flattened multi-walled carbon nanotubes (MWNTs). These processes occur via the merging of adjacent tubes which is triggered by B interstitial atoms.(6) By using the mixed gases (methane + sulfur) instead of methane, we found that the obtained nanotubes exhibited the increased shell numbers, possibly due to the increased size of metal particles on the outer surface of supporting materials.(7) We successfully attached fluorine atoms to the sidewall of outer shell in DWNTs through direct reaction with fluorine gas at 200℃ for 5 hrs. The stoichiometry of the fluorinated DWNTs is CF_<0.30>, based on XPS study, while double-layered structure is sustained after fluorination according to HR-TEM observation. By tuning electronic property of only outer shell and controlling dispensability of DWNTs without disrupting double-layered concentric shell morphology through fluorination, we envisaged these chemically modified DWNTs to be useful in the fabrication of novel sensors, nanocomposites and electronic devices. Less

在本项目中，我们通过准确了解纳米金属颗粒在纳米管生长过程中的关键功能，成功地采用催化化学气相沉积法制备了高纯度碳纳米管，并对其进行了结构表征。研究成果总结如下：（1）通过了解，我们开发了合成高纯度双壁碳纳米管（DWNT）的方法。催化化学气相沉积（CVD）方法中碳纳米管的生长机制已被长期讨论。具体来说，我们阐明了支撑材料的重要性，因为它们的尺寸和成分直接有助于形成用于生长碳纳米管的纳米金属颗粒。(2)我们发现850℃的反应温度是比单壁碳纳米管(SWNT)优先生长薄DWNT(约0.8 nm)的最佳条件。(3)当DWNT在100℃下热处理时在2000℃的氩气中，相邻的外壳在结构上融合，形成聚结的纳米结构。（4）DWNT衍生的巴基纸表现出更高的抗氧化性，此外，具有大量小于1纳米的纳米孔。（5）我们证明，在双壁碳纳米管（DWNT）之间硼（B）原子的结合热退火（1400 -1600℃）导致共价纳米管“Y”结、DWNT 聚结并形成扁平多壁碳纳米管（MWNT）。这些过程是通过B间隙原子触发的相邻管的合并而发生的。(6)通过使用混合气体(甲烷+硫)代替甲烷，我们发现所获得的纳米管表现出增加的壳数，这可能是由于支撑材料外表面上的金属颗粒尺寸增加所致。(7)我们通过直接反应成功地将氟原子附着到DWNT的外壳侧壁上氟气200℃处理5小时。根据XPS研究，氟化DWNT的化学计量为CF_<0.30>，而根据HR-TEM观察，氟化后双层结构得以维持。通过仅调整外壳的电子特性并控制 DWNT 的分散性，而不通过氟化破坏双层同心壳形态，我们设想这些化学改性的 DWNT 可用于制造新型传感器、纳米复合材料和电子设备。较少的

项目成果

期刊论文数量（72）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Role of systemic T-cells and histopathological aspects after subcutaneous implantation of various carbon nanotubes in mice

DOI：
10.1016/j.carbon.2005.08.006
发表时间：
2006-05-01
期刊：
CARBON
影响因子：
10.9
作者：
Koyama, S;Endo, M;Kuroiwa, N
通讯作者：
Kuroiwa, N

Attomic Nanotube Welders : Boron Interstitials Triggering Connections in Double-Walled Carbon Nanotubes

原子纳米管焊机：硼填隙物触发双壁碳纳米管中的连接

DOI：
发表时间：
2005
期刊：
Nano Letters 5(6)
影响因子：
0
作者：
M.Endo;H.Muramatsu;T.Hayashi;Y.A.Kim;G.Van Lier;J-Chrisophe Charlier;H.Terrones;M.Terrones;M.S.Dresselhaus
通讯作者：
M.S.Dresselhaus

Oxidation and thermal stability of linear carbon chains contained in thermally treated double walled carbonnanotube

热处理双壁碳纳米管中所含线性碳链的氧化和热稳定性

DOI：
发表时间：
2007
期刊：
Small (in press)
影响因子：
0
作者：
H.Muramatsu;Y.A.Kim;T.Hayashi;M.Endo;M.Terrones;M.S.Dresselhaus
通讯作者：
M.S.Dresselhaus

Fabrications and structural characterization of ultra-fine carbon fibers by electrospinning of polymer blends

聚合物共混物静电纺丝超细碳纤维的制备和结构表征

DOI：
发表时间：
2007
期刊：
Solid State Communications 142
影响因子：
0
作者：
C.Kim;Y.J.Cho;W.Y.Yun;B.T.N.Ngoc;K.S.Yang;D.R.Chang;J.W.Lee;M.Kojima;Y.A.Kim;M.Endo
通讯作者：
M.Endo

Oxidation and thermal stabillity of linear carbon chains contained in thermally treated double walled carbon nanotubes

热处理双壁碳纳米管中所含线性碳链的氧化和热稳定性