Nanomaterials & Nanoelectron ...分享



已有 5960 次阅读 2009-1-8 04:44 |系统分类:科研笔记|关键词:学者

 这几天在网上看到不少关于我们组在ACS Nano上发表的论文的报道 (Ishikawa, F. N.; Chang, H. K.; Ryu, K.; Chen, P.; Badmaev, A.; Gomez De Arco, L.; Shen, G. Z.; Zhou, C. W. ACS Nano, 2008, in press. "Transparent electronics based on transfer printed aligned carbon nanotubes on rigid and flexible substrates".),这里挑两个贴出来。在我的上个帖子中(,黄庆建议我有空聊聊文章里面的东西。可惜我这个人写作水平有限,把文章搞的科普一点对于我来说实在力不从心,所以只好捡下面几个媒体的报道贴出来和大家分享。



我修改完后,email给学生,学生继续修改,老板修改。多遍之后投到Nature Nanotechnology,不过没有通过编辑这一关就直接退了回来。再后来,只好投到ACS Nano,审了近两个月,终于最后发表。


Viterbi Researchers Print Transparent Nanotube Transistor Lattices  
Low-temperature process produces both n-type and p-type transistors; allows embedding of LEDs

December 17, 2008 —

It's a clear, colorless disk about 5 inches in diameter that bends and twists like a playing card, with a lattice of more than 20,000 nanotube transistors capable of high-performance electronics printed upon it using a potentially inexpensive low-temperature process.

 Its Hsieh Department creators believe the prototype points the way to such long sought after applications as car windshields that display vehicle information. It could also be used to create cheap, ultra thin, low-power "e-paper" displays. It might even be incorporated into fabric that would change color or pattern as desired for clothing or even wall covering, into nametags, signage and other applications.

A team at the USC Viterbi School of Engineering created the new device, described and illustrated in a just-published paper on “Transparent Electronics Based on Printed Aligned Nanotubes on Rigid and Flexible Structures” in the journal ACS Nano.

Fabrication steps, leading to regular arrays of single-wall nanotubes (bottom).

Professor Chongwu Zhou, together with graduate students Fumiaki Ishikawa and Hsiaoh-Kang Chang worked on the project on the project, which solved problems of attaching dense matrices of carbon nanotubes not just to heat-resistant glass but also to flexible but highly heat-vulnerable transparent plastic substrates.

The researchers not only created printed circuit lattices of nanotube-based transistors to the transparent plastic but also additionally connected them to commercial gallium nitrate (GaN) light-emitting diodes, which change their luminosity by a factor of 1,000 as they are energized.

"Our results suggest that aligned nanotubes have great potential to work as building blocks for future transparent electronics," say the researchers.

The thin transparent thin-film transistor technology developed employs carbon nanotubes - tubes with walls one carbon atom thick - as the active channels for the circuits, controlled by iridium-tin oxide electrodes which function as sources, gates and drains.

Earlier attempts at transparent devices used other semiconductor materials with disappointing electronic results, enabling one kind of transistor (n-type); but not p-types; both types are needed for most applications.

The critical improvement in performance, according to the research, came from the ability to produce extremely dense, highly patterned lattices of nanotubes, rather than random tangles and clumps of the material. The Zhou lab has pioneered this technique over the past three years.

The paper contains a description of how the new devices are made.

Gallium Nitride (GaN) particle embedded in transistor net glows brighter as it is energized more vigorously.
"These nanotubes were first grown on quartz substrates and then transferred to glass or PET substrates with pre-patterned indium-tin oxide (ITO) gate electrodes, followed by patterning of transparent source and drain electrodes. In contrast to random networked nanotubes, the use of massively aligned nanotubes enabled the devices to exhibit high performance, including high mobility, good transparency, and mechanical flexibility.

"In addition, these aligned nanotube transistors are easy to fabricate and integrate, as compared to individual nanotube devices. The transfer printing process allowed the devices to be fabricated through low temperature process, which is particularly important for realizing transparent electronics on flexible substrates. … While large manufacturability must be addressed before practical applications are considered, our work has paved the way for using aligned nanotubes for high-performance transparent electronics "

Zhou is corresponding author on the paper, with Ishikawa and Chang co-authors. Viterbi School graduate students Koungmin Ryu, Pochiang Chen, Alexander Badmaev, Lewis Gomez De Arco, and Guozhen Shen also participated in the project. Zhou, an associate professor, holds the Viterbi School's Jack Munushian Early Career Chair.

The Focus Center Research Program (FCRP FENA) and the National Science Foundation supported the research. The original article can be read at:



作者:记者:吉泽 惠     来源:日经BP社     阅读:83 次     日期:12/26/2008 3:25:00 PM  

      美国南加州大学(University of Southern California)利用碳纳米管(CNT)开发出了载流子迁移率最大为1300cm2/Vs的透明TFT英文发布资料。载流子迁移率的提高是通过提高CNT结构的密度而实现的。最大透射率平均为80%。开、闭路时,源/漏极间的电流比为3×104。因能用120℃以下的工艺制作,可在玻璃和PET底板上形成TFT。

  开发该TFT的是南加州大学电子工程系(Department of Electrical Engineering)教授周崇武(Chongwu Zhou)的研究小组。制法为:首先使CNT在石英底板上生长,然后将其移动到预先形成了ITO栅电极的玻璃或PET底板上。之后,形成透明源极和漏极。CNT管壁的厚度相当于一个碳原子。

  周崇武等人表示,采用此次开发的透明TFT驱动市场上销售的GaN LED时,光度可达原来的1000倍。


上一篇:Flexible and transparent supercapacitor


发表评论 评论 (2 个评论)



Archiver|手机版|科学网 ( 京ICP备07017567号-12 )

GMT+8, 2023-3-29 13:26

Powered by

Copyright © 2007- 中国科学报社