| 查看: 581 | 回复: 3 | ||
| 【奖励】 本帖被评价1次，作者chl5063增加金币 1 个 | ||
| 当前主题已经存档。 | ||
[资源]
碳纳米管的长度再创新高！
|
||
|
The longest carbon nanotubes you've ever seen Using techniques that could revolutionize manufacturing for certain materials, researchers have grown carbon nanotubes that are the longest in the world. While still slightly less than 2 centimeters long, each nanotube is 900,000 times longer than its diameter. The fibers--which have the potential to be longer, stronger and better conductors of electricity than copper and many other materials--could ultimately find use in smart fabrics, sensors and a host of other applications. To grow the aligned bundles of tiny tubes, the researchers combined advantages of chemical vapor deposition (CVD), a technique for creating thin coatings that is especially common in the semiconductor industry, with a novel substrate and catalyst onto which the carbon attaches. Supported by the National Science Foundation and the Office of Naval Research, University of Cincinnati professors Vesselin Shanov and Mark Schulz collaborated with post-doctoral researcher Yun Yeo Heung and students to develop the technique. The researchers partnered with First Nano, a division of CVD Equipment Corp. of Ronkonkoma, N.Y., to use their laboratory and a specialized furnace called the EasyTube 3000. With the equipment, the researchers were able to break apart hydrocarbons to create a vapor of carbon-atom starting material. Within the vapor sat the new substrate--a catalyst made of alternating metal and ceramic layers atop an oxidized-silicon wafer base--which served as the foundation for growth. "This process is revolutionary because it allows us to keep the catalyst 'alive' for a long period of time thus, providing fast and continuous transport of the carbon 'building blocks' to the carbon nanotube growth zone," said Shanov. The carbon nanotubes are extremely long compared to predecessors--the longest is 3 millimeters beyond the prior world record. More important for manufacturing, the research team grew a 12-millimeters-thick, uniform carpet of aligned carbon nanotubes on a roughly 10-centimeter silicon substrate, opening the door for scaling-up the process. The inventions were presented in April 2007 at the Single Wall Carbon Nanotube Nucleation and Growth Mechanisms workshop organized by NASA and Rice University. The research was supported by NSF grant 0510823, in addition to support from the Office of Naval Research through North Carolina A&T SU. Source: National Science Foundation |
回复此楼» 猜你喜欢
修改论文，如何借助其他力量？
已经有4人回复
-
中山大学潘越教授课题组2027级推免硕士研究生招生 新增一个专业医学技术名额
已经有21人回复
-
金属材料论文润色/翻译怎么收费?
已经有66人回复
» 本主题相关商家推荐: (我也要在这里推广)
2楼2007-05-12 19:13:57
3楼2007-05-13 21:57:31
4楼2007-05-13 23:03:07
10