Laser ablation for the synthesis of carbon nanotubes
    3.
    发明授权
    Laser ablation for the synthesis of carbon nanotubes 有权
    用于合成碳纳米管的激光烧蚀

    公开(公告)号:US08317983B1

    公开(公告)日:2012-11-27

    申请号:US12798377

    申请日:2010-04-02

    IPC分类号: B01J19/12

    摘要: Single walled carbon nanotubes are produced in a novel apparatus by the laser-induced ablation of moving carbon target. The laser used is of high average power and ultra-fast pulsing. According to various preferred embodiments, the laser produces and output above about 50 watts/cm2 at a repetition rate above about 15 MHz and exhibits a pulse duration below about 10 picoseconds. The carbon, carbon/catalyst target and the laser beam are moved relative to one another and a focused flow of “side pumped”, preheated inert gas is introduced near the point of ablation to minimize or eliminate interference by the ablated plume by removal of the plume and introduction of new target area for incidence with the laser beam. When the target is moved relative to the laser beam, rotational or translational movement may be imparted thereto, but rotation of the target is preferred.

    摘要翻译: 单壁碳纳米管通过激光诱导的移动碳靶的消融在新型装置中产生。 使用的激光器具有高平均功率和超快速脉冲。 根据各种优选实施例,激光器以高于约15MHz的重复频率产生并输出高于约50瓦特/平方厘米,并且表现出低于约10皮秒的脉冲持续时间。 碳,碳/催化剂靶和激光束相对于彼此移动,并且在消融点附近引入侧面泵送的预热惰性气体的聚焦流,以通过去除羽流来最小化或消除被消融的羽流的干扰, 用激光束引入新的目标区域入射。 当目标相对于激光束移动时,可以赋予旋转或平移运动,但是靶的旋转是优选的。

    Method of purifying nanotubes and nanofibers using electromagnetic radiation

    公开(公告)号:US07014737B2

    公开(公告)日:2006-03-21

    申请号:US10174477

    申请日:2002-06-17

    IPC分类号: D01F9/12

    摘要: Disclosed are methods of purifying mixtures comprising nanofibers and/or nanotubes and residual catalyst particles that are covered by outer layers of the nanotube or nanofiber material. The mixtures are exposed to electromagnetic radiation, which induces localized heating in the residual catalyst particles. The localized heating creates breaches in the outer layers. Thereafter, the residual catalyst particles may be removed under relatively mild conditions that do not significantly affect the structural integrity of the nanotubes or nanofibers. The methods of the invention have been used to particular advantage in the purification of single wall carbon nanotubes (SWNTs) synthesized using metal catalysts. For these SWNTs, microwave radiation is preferably used to induce the localized heating, the outer layers are preferably removed at least in part by carrying out the localized heating under air, and the residual catalyst may be removed by exposure to relatively dilute aqueous acid.

    Boron-Doped Single-Walled Nanotubes(SWCNT)
    5.
    发明申请
    Boron-Doped Single-Walled Nanotubes(SWCNT) 审中-公开
    硼掺杂单壁纳米管(SWCNT)

    公开(公告)号:US20100219383A1

    公开(公告)日:2010-09-02

    申请号:US12530369

    申请日:2008-03-07

    申请人: Peter C. Eklund

    发明人: Peter C. Eklund

    IPC分类号: H01B1/04 C01B31/36 B05D1/02

    摘要: The present invention generally relates to methods and apparatus for the synthesis or preparation of boron-doped single-walled carbon nanotubes (B-SWCNTs). The invention provides a high yield, single step method for producing large quantities of continuous macroscopic carbon fiber from single-wall carbon nanotubes using inexpensive carbon feedstocks wherein the carbon nanotubes are produced by in situ boron substitutional doping. In one embodiment, the nanotubes disclosed are used, singularly or in multiples, in power transmission cables, in solar cells, in batteries, as antennas, as molecular electronics, as probes and manipulators, and in composites. It is another object of this invention to provide macroscopic carbon fiber made by such a method.

    摘要翻译: 本发明一般涉及用于合成或制备硼掺杂单壁碳纳米管(B-SWCNT)的方法和装置。 本发明提供了一种高产率的单步法,用于使用廉价的碳原料从单壁碳纳米管制备大量的连续宏观碳纤维,其中碳纳米管是通过原位硼取代掺杂生产的。 在一个实施例中,公开的纳米管单独地或多次地用于输电电缆,太阳能电池,电池,天线,分子电子学,探针和操纵器以及复合材料中。 本发明的另一个目的是提供由这种方法制成的宏观碳纤维。

    Purification of carbon filaments and their use in storing hydrogen
    8.
    发明授权
    Purification of carbon filaments and their use in storing hydrogen 失效
    碳丝的净化及其在储存氢气中的应用

    公开(公告)号:US06869583B2

    公开(公告)日:2005-03-22

    申请号:US10120827

    申请日:2002-04-12

    摘要: Carbon structures, e.g. carbon nano-fibers, suitable for absorbing hydrogen at low pressures and low temperatures are produced by a selective oxidation and/or acid reflux process. The process includes heating an impure mixture containing a crystalline form of carbon in the presence of an oxidizing gas at a temperature and time sufficient to selectively oxidize and remove a substantial amount of any amorphous carbon impurities from the mixture. Metal containing impurities can be removed from the mixture by exposing the desired carbon and accompanying impurities to an acid to produce a carbon fiber that is substantially free of both non-fiber carbon impurities and metal impurities. Another aspect of the present invention includes purified carbon structures that can store hydrogen at low pressures and temperatures.

    摘要翻译: 碳结构,例如 通过选择性氧化和/或酸回流过程产生适合于在低压和低温下吸收氢的碳纳米纤维。 该方法包括在氧化气体存在下加热含有结晶形式的不纯的混合物,该温度和时间足以选择性氧化和从混合物中除去大量的任何无定形碳杂质。 通过将所需的碳和伴随的杂质暴露于酸中以产生基本上不含非纤维碳杂质和金属杂质的碳纤维,可以从混合物中除去含金属杂质。 本发明的另一方面包括可以在低压和低温下储存氢的纯化碳结构。

    Laser ablation for the synthesis of carbon nanotubes
    9.
    发明授权
    Laser ablation for the synthesis of carbon nanotubes 失效
    用于合成碳纳米管的激光烧蚀

    公开(公告)号:US07692116B1

    公开(公告)日:2010-04-06

    申请号:US10188525

    申请日:2002-07-03

    IPC分类号: B23K26/12

    摘要: Single walled carbon nanotubes are produced in a novel apparatus by the laser-induced ablation of moving carbon target. The laser used is of high average power and ultra-fast pulsing. According to various preferred embodiments, the laser produces an output above about 50 watts/cm2 at a repetition rate above about 15 MHz and exhibits a pulse duration below about 10 picoseconds. The carbon, carbon/catalyst target and the laser beam are moved relative to one another and a focused flow of “side pumped”, preheated inert gas is introduced near the point of ablation to minimize or eliminate interference by the ablated plume by removal of the plume and introduction of new target area for incidence with the laser beam. When the target is moved relative to the laser beam, rotational or translational movement may be imparted thereto, but rotation of the target is preferred.

    摘要翻译: 单壁碳纳米管通过激光诱导的移动碳靶的消融在新型装置中产生。 使用的激光器具有高平均功率和超快速脉冲。 根据各种优选实施例,激光器以高于约15MHz的重复频率产生大于约50瓦特/平方厘米的输出,并且表现出低于约10皮秒的脉冲持续时间。 碳,碳/催化剂靶和激光束相对于彼此移动,并且在消融点附近引入预热的惰性气体的聚焦流动,以最小化或消除被消除的羽流的干扰, 羽流和引入新的目标区域与激光束的入射。 当目标相对于激光束移动时,可以赋予旋转或平移运动,但是靶的旋转是优选的。

    Method for low temperature synthesis of single wall carbon nanotubes
    10.
    发明授权
    Method for low temperature synthesis of single wall carbon nanotubes 失效
    单壁碳纳米管的低温合成方法

    公开(公告)号:US07338648B2

    公开(公告)日:2008-03-04

    申请号:US10326276

    申请日:2002-12-23

    IPC分类号: B82B3/00

    摘要: The present invention is directed towards a method of producing single wall carbon nanotubes which comprises providing a catalyst comprising an alumina support and a component selected from the group consisting of reduced Fe, reduced Fe/Mo, Fe oxide, and Fe/Mo oxide, and growing, in an inert atmosphere, single wall carbon nanotubes by passing a gas comprising methane over the catalyst at a temperature and for a time sufficient to grow single wall carbon nanotubes. The invention is also directed towards a single wall carbon nanotube produced by such a method. The invention is also directed towards a catalyst for producing SWNTs, wherein the catalyst comprises an alumina support and a component selected from the group consisting of reduced Fe, reduced Fe/Mo, Fe oxide, and Fe/Mo oxide.

    摘要翻译: 本发明涉及一种制备单壁碳纳米管的方法,其包括提供包含氧化铝载体和选自还原Fe,还原Fe / Mo,Fe氧化物和Fe / Mo氧化物的组分的催化剂,以及 在惰性气氛中通过在包含甲烷的气体在催化剂上经过足以使单壁碳纳米管生长的温度和时间内使单壁碳纳米管生长。 本发明还涉及通过这种方法制备的单壁碳纳米管。 本发明还涉及用于制备SWNT的催化剂,其中催化剂包含氧化铝载体和选自还原Fe,还原Fe / Mo,Fe氧化物和Fe / Mo氧化物的组分。