纳米管可以用于焊接细微裂口
文章来源:未知 文章作者:enread 发布时间:2013-11-26 06:57 字体: [ ]  进入论坛
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University of Illinois researchers have developed a way to heal gaps in wires too small for even the world's tiniest soldering1 iron(烙铁). Led by electrical and computer engineering professor Joseph Lyding and graduate student Jae Won Do, the Illinois team published its results in the journal Nano Letters.
 
Carbon nanotubes are like tiny hollow wires of carbon just 1 atom thick -- similar to graphene but cylindrical2(圆柱形的). Researchers have been exploring using them as transistors4 instead of traditional silicon5, because carbon nanotubes are easier to transport onto alternate substrates, such as thin sheets of plastic, for low-cost flexible electronics or flat-panel displays.
 
Carbon nanotubes themselves are high-quality conductors, but creating single tubes suitable to serve as transistors is very difficult. Arrays of nanotubes are much easier to make, but the current has to hop6 through junctions7 from one nanotube to the next, slowing it down. In standard electrical wires, such junctions would be soldered8, but how could the gaps be bridged on such a small scale?
 
"It occurred to me that these nanotube junctions will get hot when you pass current through them," said Lyding, "kind of like faulty wiring in a home can create hot spots. In our case, we use these hot spots to trigger a local chemical reaction that deposits metal that nano-solders the junctions."
 
Lyding's group teamed with Eric Pop, an adjunct professor(兼职教授,副教授) of electrical and computer engineering, and John Rogers, Swanlund professor in materials science and engineering, experts on carbon nanotube synthesis and transfer, as well as chemistry professor Greg Girolami. Girolami is an expert in a process that uses gases to deposit metals on a surface, called chemical vapor9 deposition10 (CVD化学气相沉积).
 
The nano-soldering process is simple and self-regulating. A carbon nanotube array is placed in a chamber11 pumped full of the metal-containing gas molecules12. When a current passes through the transistor3, the junctions heat because of resistance as electrons flow from one nanotube to the next. The molecules react to the heat, depositing the metal at the hot spots and effectively "soldering" the junctions. Then the resistance drops, as well as the temperature, so the reaction stops.
 
The nano-soldering takes only seconds and improves the device performance by an order of magnitude -- almost to the level of devices made from single nanotubes, but much easier to manufacture on a large scale.
 
"It would be easy to insert the CVD process in existing process flows," Lyding said. "CVD technology is commercially available off-the-shelf. People can fabricate these transistors with the ability to turn them on so that this process can be done. Then when it's finished they can finish the wiring and connect them into the circuits. Ultimately it would be a low-cost procedure."
 
Now, the group is working to refine the process.
 
"We think we can make it even better," Lyding said. "This is the prelude13(前奏,序曲), we hope, but it's actually quite significant."
 
The National Science Foundation and the Office of Naval14 Research supported this work. Lyding and Rogers also are affiliated15 with the Beckman Institute for Advanced Science and Technology at the U. of I.


点击收听单词发音收听单词发音  

1 soldering 308a46b7e24a05d677a12004923dc03d     
n.软焊;锡焊;低温焊接;热焊接v.(使)焊接,焊合( solder的现在分词 )
参考例句:
  • Care must be exercised in attaching the lead wires to the soldering tabs. 在往接线片上焊导线时必须非常小心。 来自辞典例句
  • I suggest posing me with a soldering wand over my head like a sword. 我想让自己这样像把剑一样把电焊杆举过头顶。 来自电影对白
2 cylindrical CnMza     
adj.圆筒形的
参考例句:
  • huge cylindrical gas tanks 巨大的圆柱形贮气罐
  • Beer cans are cylindrical. 啤酒罐子是圆筒形的。
3 transistor WnFwS     
n.晶体管,晶体管收音机
参考例句:
  • This make of transistor radio is small and beautifully designed.这半导体收音机小巧玲珑。
  • Every transistor has at least three electrodes.每个晶体管至少有三个电极。
4 transistors ff750796e6ff1fb40d6a8248a6485dc3     
晶体管( transistor的名词复数 ); 晶体管收音机,半导体收音机
参考例句:
  • In semiconductor receivers transistors take the place of vacuum tubes. 在半导体收音机中晶体管代替了真空管。
  • We often turn to this handbook for information on transistors. 我们常从这本手册查阅有关晶体管的资料。
5 silicon dykwJ     
n.硅(旧名矽)
参考例句:
  • This company pioneered the use of silicon chip.这家公司开创了使用硅片的方法。
  • A chip is a piece of silicon about the size of a postage stamp.芯片就是一枚邮票大小的硅片。
6 hop vdJzL     
n.单脚跳,跳跃;vi.单脚跳,跳跃;着手做某事;vt.跳跃,跃过
参考例句:
  • The children had a competition to see who could hop the fastest.孩子们举行比赛,看谁单足跳跃最快。
  • How long can you hop on your right foot?你用右脚能跳多远?
7 junctions 8d6818d120fa2726af259fc9dc6c7c61     
联结点( junction的名词复数 ); 会合点; (公路或铁路的)交叉路口; (电缆等的)主结点
参考例句:
  • Metals which were mutually soluble would tend to give strong junctions. 可互溶的金属趋向于产生牢固的结合点。
  • Some adhering junctions are present as narrow bands connecting two cells. 有些粘附连接以一窄带的形式连接两个细胞。
8 soldered 641d7a7a74ed6d1ff12b165dd1ac2540     
v.(使)焊接,焊合( solder的过去式和过去分词 )
参考例句:
  • Three lead wires are soldered to the anchor terminals. 在固定接线端子上焊有三根导线。 来自辞典例句
  • He soldered the broken wires together. 他将断了的电线焊接起来。 来自辞典例句
9 vapor DHJy2     
n.蒸汽,雾气
参考例句:
  • The cold wind condenses vapor into rain.冷风使水蒸气凝结成雨。
  • This new machine sometimes transpires a lot of hot vapor.这部机器有时排出大量的热气。
10 deposition MwOx4     
n.免职,罢官;作证;沉淀;沉淀物
参考例句:
  • It was this issue which led to the deposition of the king.正是这件事导致了国王被废黜。
  • This leads to calcium deposition in the blood-vessels.这导致钙在血管中沉积。
11 chamber wnky9     
n.房间,寝室;会议厅;议院;会所
参考例句:
  • For many,the dentist's surgery remains a torture chamber.对许多人来说,牙医的治疗室一直是间受刑室。
  • The chamber was ablaze with light.会议厅里灯火辉煌。
12 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
13 prelude 61Fz6     
n.序言,前兆,序曲
参考例句:
  • The prelude to the musical composition is very long.这首乐曲的序曲很长。
  • The German invasion of Poland was a prelude to World War II.德国入侵波兰是第二次世界大战的序幕。
14 naval h1lyU     
adj.海军的,军舰的,船的
参考例句:
  • He took part in a great naval battle.他参加了一次大海战。
  • The harbour is an important naval base.该港是一个重要的海军基地。
15 affiliated 78057fb733c9c93ffbdc5f0ed15ef458     
adj. 附属的, 有关连的
参考例句:
  • The hospital is affiliated with the local university. 这家医院附属于当地大学。
  • All affiliated members can vote. 所有隶属成员都有投票权。
TAG标签: process carbon nanotubes
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