c****g
发帖数: 18 | 1 Title: Fabrication of Integrated Field-Effect Transistors and Detecting
System Based on CVD Grown Graphene
ABSTRACT:
An integrated field-effect transistors based on large-area multilayer
graphene produced by chemical vapor deposition was fabricated in this work.
A planar Au sheet was used as gate electrode integrated with graphene FET to
obtain perpendicular electrical field between gate and graphene substrate.
Graphene film was transferred to cover indium tin oxides films which were
used as dra... 阅读全帖 |
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s*********s
发帖数: 18 | 2 Thanks for your good explains and good comments.
The following responds to your one by one
单层graphene谁能加gate打开gap？？？
As mention above,i didn't mention the conclusion that monolayer graphene can
open band gap. But researcher have been shown that monolayer graphene nano-
mesh and nano-ribbon can open band gap under the applied electric field.
1.强磁场下当然是形成朗道能级啦，不过graphene有零能的LL，弱场下应该没有gap
The effect of the applied perpendicular magnetic can induce the splitting of
Landau Level and the zero-energy L... 阅读全帖 |
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a*****c
发帖数: 3525 | 3 Definition: Graphene is a material discovered by a team out of the
University of Manchester in 2004. It is a sheet of carbon atoms bound
together with double electron bonds (called a sp2 bond) in a thin film only
one atom thick. Atoms in graphene are arranged in a honeycomb-style lattice
pattern.
Artistic view of our smallest (nanometre size) quantum dot.
University of Manchester
Structure of Graphene
Graphene is extracted from graphite, which is how it gets its name. In fact,
graphene provides |
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e******r
发帖数: 23 | 4 又看到一篇graphene的paper. 请各位高人评点. 好像很多以前做nanotube的人转去做
graphene, 这东西真的比nanotube有前景? 这东东的aspect ratio不够吗,在机械性能
方面不理想吧?
Nature Nanotechnology 3, 101 - 105 (2007)
Published online: 27 January 2008 | doi:10.1038/nnano.2007.451
Subject Categories: Nanomaterials | Synthesis and processing
Processable aqueous dispersions of graphene nanosheets
Dan Li1, Marc B. Müller1, Scott Gilje2, Richard B. Kaner2 & Gordon G.
Wallace1
Abstract
Graphene sheets offer extraordinary electronic, thermal and mechanical
proper |
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s*********s
发帖数: 18 | 5 graphene 研究的一个问题（请教前辈）：
graphene 在电场的gate的作用下，可以打开bandgap,i.e bilayer----- tunnable
bandgap, trilayer -----overlap band gap.
1.那么在perpendicular magnetic field 的作用下，graphene 的情况如何呢？
bandgap 能打开？ 还是打开excitonic condensation gap?还是其他情况？？
2. four-terminal graphene device 在perpendicular magnetic field 的作用下，发
现测量的电阻（不是hall effect 磁阻）线性或者非线性的随着磁场增加而增加，也就
是： R vs B， 这个如何解释？
希望前辈指教！ |
|
b******o
发帖数: 110 | 6 march meeting回来，最大的感觉就是toplogical insulator现在火的不行，大有取代
graphene之势，老板现在也盘算着想趟这淌水，但我总有个疑问，这东西以后前途真的
大么？
我们组做凝聚态实验，graphene目前也做的挺顺手，虽说graphene也是个成功的炒作，
但也算是一步步逼近工业应用了，而且本身物理上可以研究的也很多。toplogical
insulator就不太熟悉，打听了一下，目前做实验的形势就是：材料难找,transpot实验
难做，很多高水平的组在抢做实验的credit。
还是看一下形势再说吧，何况graphene估计还能火个一两年。。。 |
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s*********s
发帖数: 18 | 7 小弟正在做spin hall effect in graphene.
敬请前辈给点指教！
i.e
1.如何控制graphene边缘态edgy state(zigzag、 armchair )
2.结构如何设计spin hall effect configuration（big spin diffusion length)
3.如何提高graphene spin-orbit interaction(graphene weak SOL) |
|
s*********s
发帖数: 18 | 8 graphene 研究的一个问题（请教前辈）：
graphene 在电场的gate的作用下，可以打开bandgap,i.e bilayer----- tunnable
bandgap, trilayer -----overlap band gap.
1.那么在perpendicular magnetic field 的作用下，graphene 的情况如何呢？
bandgap 能打开？ 还是打开excitonic condensation gap?还是其他情况？？
2. four-terminal graphene device 在perpendicular magnetic field 的作用下，发
现测量的电阻（不是hall effect 磁阻）线性或者非线性的随着磁场增加而增加，也就
是： R vs B， 这个如何解释？
希望前辈指教！ |
|
w*********y
发帖数: 10 | 9 The Fondazione Istituto Italiano di Tecnologia - IIT - was founded with the
objective of promoting the country's technological development and further
education in science and technology.In this sense IIT is committed to
achieving its scientific program, which it sees in the integration between
basic scientific research and the development of technical applications, a
major inspirational principle. The research areas cover areas of science of
high innovative content, representing the most advanc... 阅读全帖 |
|
K****D
发帖数: 30533 | 10 billtian和ken213用的都不是Graphene Speed MP，他们用的都是更重的版本。
billtian: IG Speed (18x20 or 16x19)
ken213: Graphene Speed Pro
这两款是同一系列。Graphene Speed MP是不同系列，对应于以前的IG Speed 300. |
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a***8
发帖数: 2433 | 11 嗯，又看了一下，Graphene和IG根本就是两只不同的动物。Graphene Speed MP和
Radical MP很接近但增加了力量和旋转，两个都是Radical的弱项。Graphene Speed
Pro和Prestige S 很接近但更强调力量和精准（18X20 VS. 16X19)，看起来都很值得一
试，长草呀。。。 |
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f******n
发帖数: 72 | 12
Yes！
Definitely, graphene and CNT have wide applications.
In my field: passively mode locking fiber lasers,several companies have used
CNT to mode lock fiber lasers and generate high power fs pulses.
CNT based saturable absorber has become commercialized.
Moreover,similiar to CNT, graphene could also be used as ultra-fast
universial saturable absorber which could mode lock lasers at any wavelength.
If you feel interested, you could visit wiki website of graphene:
http://en.wikipedia.org/wiki/Gr |
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f******n
发帖数: 72 | 13
used
wavelength.
http://www.natureasia.com/asia-materials/highlight.php?id=594
石墨烯锁模被Nature Asia亮点了！
NPG Asia Materials research highlight | doi:
Published online 21 December 2009
Graphene: Mode-locked lasers
Fig. 1: A graphene–polymer composite film (white) can be used as a laser
mode locker. The laser schematic is shown in the background, and an optical
fiber for laser output is shown on the left.
Although graphene potentially has many applications, reports on exploiting
its optical propertie |
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s*********s
发帖数: 18 | 14 为什么理论预测graphene spin diffusion length 可达到100 um,但实际测量还不到
10um, 室温只有1-2 um 在single layer graphene. 另外：Spin life time is 50-
200ps, the order of magnitude shorter than expected from the intrinsic spin-
orbit coupling(-us).The results indicates that the presence of the extrinsic
spin relaxation mechanism.
请前辈指点。
why graphene for spintronics?
1. Extraordinary high mobility
>200000cm2v-1s-1 (suspended , low temperature)
>40000cm2v-1s-1 (on sio2 , room temperature)
-------Future high-speed transistor... 阅读全帖 |
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w*********y
发帖数: 10 | 15 The Fondazione Istituto Italiano di Tecnologia - IIT - was founded with the
objective of promoting the country's technological development and further
education in science and technology.In this sense IIT is committed to
achieving its scientific program, which it sees in the integration between
basic scientific research and the development of technical applications, a
major inspirational principle. The research areas cover areas of science of
high innovative content, representing the most advanc... 阅读全帖 |
|
s*********s
发帖数: 18 | 16 为什么理论预测graphene spin diffusion length 可达到100 um,但实际测量还不到
10um, 室温只有1-2 um 在single layer graphene. 另外：Spin life time is 50-
200ps, the order of magnitude shorter than expected from the intrinsic spin-
orbit coupling(-us).The results indicates that the presence of the extrinsic
spin relaxation mechanism.
请前辈指点。
why graphene for spintronics?
1. Extraordinary high mobility
>200000cm2v-1s-1 (suspended , low temperature)
>40000cm2v-1s-1 (on sio2 , room temperature)
-------Future high-speed transistor... 阅读全帖 |
|
g*******g
发帖数: 447 | 17 spintronics是什么？我觉得这个都还没有完全定义好。
graphene spintronics 只不过是很多graphene泡泡中的一个罢了
graphene 肯定会有用，但是十有八九是低端的低科技应用 |
|
a*****c
发帖数: 3525 | 18 Fastest Graphene Transistor Yet
IBM researchers report the creation of a transistor that operates at 26 GHz,
the highest frequency yet achieved for the 2-D carbon material
Elizabeth K. Wilson
New progress in the blossoming field of graphene-based electronics comes
from IBM researchers, who report the creation of a graphene transistor that
operates at 26 GHz, the highest frequency yet achieved (Nano Lett., DOI: 10.
1021/nl803316h). The researchers also show that the performance of these
transisto |
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a*****c
发帖数: 3525 | 19 Graphene Via Arc Discharge
Electrical method yields sheets of carbon a few atoms thick
Mitch Jacoby
A simple electrical method provides an alternative way to prepare graphene
samples, according to researchers in India. Graphene—one-atom-thick sheets
of carbon packed in a honeycomb structure—has recently attracted
considerable attention for its outstanding electronic and mechanical
properties (C&EN, March 2, page 14). Single- and few-layer forms of the
material have been made by peeling apart gra |
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a*****c
发帖数: 3525 | 20 Preparing Large High-Quality Graphene Films
New methods could yield agile devices from carbon-based electronic material
Mitch Jacoby
Ji Hye Hong/Nature
FLEX TIME Patterned graphene films grown by a new method are easily
transferred to polymers and other supports and resist damage from bending.
Two methods for preparing large high-quality films of graphene may lead to
inexpensive, large-area electronic devices that can be flexed, bent, and
folded. Such agility from ordinarily rigid and fragile de |
|
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a*****c
发帖数: 3525 | 22 Graphene Holds Promise For Spintronics
ScienceDaily (Feb. 15, 2008) — Graphene is a nanomaterial combining very
simple atomic structure with intriguingly complex and largely unexplored
physics. Since its first isolation about four years ago researchers
suggested a large number of applications for this material in anticipation
of future technological revolutions. In particular, graphene is considered
as a potential candidate for replacing silicon in future electronic devices.
Theoretical physicis |
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a*****c
发帖数: 3525 | 23 Surprising Graphene
Honing in on graphene electronics with infrared synchrotron radiation
Contact: Paul Preuss, (510) 486-6249, p*********[email protected]
BERKELEY, CA — Graphene is the two-dimensional crystalline form of carbon:
a single layer of carbon atoms arranged in hexagons, like a sheet of chicken
wire with an atom at each nexus. As free-standing objects, such two-
dimensional crystals were believed impossible to create — even to exist —
until physicists at the University of Manchester actual |
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B*****n
发帖数: 654 | 24 我是外行
graphene,的确很好,很强大
似乎就没有缺点了? 难道它就是个比任何其它碳材料都完美?
有什么是,graphene不擅长的地方? |
|
B*****n
发帖数: 654 | 25 我是外行
graphene,的确很好,很强大
似乎就没有缺点了? 难道它就是个比任何其它碳材料都完美?
有什么是,graphene不擅长的地方? |
|
x****y
发帖数: 1853 | 26 中英要在graphene研究和产业化上大搞合作了。华为把本压在graphene器件，IBM压在
纳米碳管。不知道最后哪个赢。 |
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S*******d
发帖数: 35 | 27 求审稿机会： Graphene, 2D TMDc 材料，拓扑绝缘体(Bi2Se3)/黑磷（BP) 等
为了NIW， 楼主真诚寻找Review的机会。
本人是UC Berkeley的一名postdoc，物理背景出身，在材料特性和器件输运方面的研究
已有8年时间。
博士的研究从事于graphene(quantum transport,detector,Raman, plasmonic etc),
spintronics( spin injection,detection, spin hall effect etc)研究.博后目前从
事于topologic insulator( Bi2Se3/Bi2Te3),valleytronics( TMDc 2D 材料，2D
heterostructure), Black phosphorus等方面研究。
楼主已有8次审稿（ACS，RCS,AIP,ELSEVIER 等期刊），一般7天之内给出审稿意见。从
来没有直接拒掉文章（博士老板的影响），总是提出自己的意见和建议，给别人一个修
改的机会。
有12篇paper发表，现寻求审稿机会。如有相关的revi... 阅读全帖 |
|
S*******d
发帖数: 35 | 28 求审稿机会： Graphene, 2D TMDc 材料，拓扑绝缘体(Bi2Se3)/黑磷（BP) 等
为了NIW， 楼主真诚寻找Review的机会。
本人是UC Berkeley的一名postdoc，物理背景出身，在材料特性和器件输运方面的研究
已有8年时间。
博士的研究从事于graphene(quantum transport,detector,Raman, plasmonic etc),
spintronics( spin injection,detection, spin hall effect etc)研究.博后目前从
事于topologic insulator( Bi2Se3/Bi2Te3),valleytronics( TMDc 2D 材料，2D
heterostructure), Black phosphorus等方面研究。
楼主已有8次审稿（ACS，RCS,AIP,ELSEVIER 等期刊），一般7天之内给出审稿意见。从
来没有直接拒掉文章（博士老板的影响），总是提出自己的意见和建议，给别人一个修
改的机会。
有12篇paper发表，现寻求审稿机会。如有相关的revi... 阅读全帖 |
|
n********2
发帖数: 152 | 29 !!! 背景不相关，就别联系了，还是留给背景相关的吧，否则自己审起来，也很累。谢
谢！!!!
RSC journal
关于chemical reduction of graphene oxide nanosheets and their
electrocatalytic activity
请背景相关( graphene 领域 )的同学站内联系。要有你个人信息，发表文章，我会把
相关背景的人的资料，转发给编辑。(最终编辑选没选你，我不知道)
谢谢！ |
|
n********2
发帖数: 152 | 30 IF: 4
key words: graphene oxide, electrochemical activity, surface chemistry
请背景相关( graphene 领域 )的 Ph.D. 站内联系。要有你个人信息，发表文章，我会
把相关背景的人的资料，转发给编辑。(最终编辑选没选你，我不知道)
!!! 背景不相关，就别联系了，还是留给背景相关的吧，否则自己审起来，也很累。谢
谢！!!! |
|
b*********s
发帖数: 6757 | 31 I would imagine Graphene Prestige should come out soon... (just a wild guess)
Graphene Speed is nothing like Prestige, it's a lot softer, bigger frame (
100sq in)
As far as which racquet is the best, my advice is never listen to anyone nor
the ratings on line. You have to demo it yourself. |
|
b*********s
发帖数: 6757 | 32 Head YOUTEK Graphene Speed Pro
Price at tenniswarehouse (new) $199.95; Buy 2 or more for $189.95 per
racquet
Head Size:100 sq. in. / 645.16 sq. cm.
Strung Weight: 11.7oz / 331.69g
Balance: 6 pts HL
Swingweight: 328
Stiffness: 68
Beam Width: 22.5mm / 22.5mm / 21.5mm /
Composition:Graphene
Power Level: Low
Stroke Style: Full
Swing Speed: Fast
String Pattern:18 Mains / 20 Crosses
condition: almost new, 我只用了一个星期。
string: full poly, big hitter black 7 (16g)
tension 58lb (一个多月了，肯定松了很多 )
grip size 4 1... 阅读全帖 |
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u*****x
发帖数: 32 | 33 申请绿卡，审稿不够，还请多帮忙。
博士期间做了很多项目，涉及到graphene fabrication, surface engineering,
mechanical test of nanocomposites, nanoparticles/graphene hybrid,
thermoelectric materials.还与同事合写了solar cell和supercapacitor方面的研究。
曾经review了一些文章，涉及CVD CNTs, CNTs composites, bucky paper, thermal
transport fiber等方面的文章。经验还算丰富，回复速度快。
对你的推荐我将十分感激!谢谢！
联系方式：站内或c********[email protected] |
|
w*****h
发帖数: 231 | 34 D是来源于Diamond，我是第一次听说。不过，现在对于graphene的D,G 2D都已经搞得很
清楚了。
对graphene而言：
D峰不是对应的是sp3,而是碳环的breathing mode.就是环的大小变化.对应声子有有限
动量,因为动量守恒,所以在没有defect的情况下是不会出现的。2D is the overtone
of D. The momentum is conserved because two phonon with opposite momentum.
The scattering path is pretty clear now for D and 2D.
G is the zone center mode in which two sub-lattices vibrate relative to
each other. |
|
e********4
发帖数: 112 | 35 现在觉得这些老板，真是什么有funding就找什么项目，跟自己本专业真是越跑越远。
本来自己挺喜欢机械的，现在越来越偏离方向了。
老板新搞个这个东西，要我做，发些Graphene让我看，那根本就是材料的东西嘛，晕死。
因为如果方向不喜欢，想读了研究生就想工作了。
所以想问问，applications of Graphene in hydrogen storage这个方向的就业情况怎
么样？？或者研究价值怎么样？ 谢谢 |
|
u*****x
发帖数: 32 | 36 申请绿卡，审稿不够，还请多帮忙。
博士期间做了很多项目，涉及到graphene fabrication, surface engineering,
mechanical test of nanocomposites, nanoparticles/graphene hybrid,
thermoelectric materials.还与同事合写了solar cell和supercapacitor方面的研究。
曾经review了一些文章，涉及CVD CNTs, CNTs composites, bucky paper, thermal
transport fiber等方面的文章。经验还算丰富，回复速度快。
对你的推荐我将十分感激!谢谢！
联系方式：站内或c********[email protected] |
|
R****i
发帖数: 2387 | 37 我老板也对graphene的东西感兴趣，
主要是对于工业界，定向graphene薄膜，比CNT更容易设计器件。 |
|
s*********4
发帖数: 3362 | 38 I have a question can graphene and Carbon Nanotube really have application
in future?
If not
When will graphene and carbon nanotube die for academic? |
|
t***s
发帖数: 163 | 39 according current development, graphene and carbon nanotube have very
limited or no real application. However they are interesting for basic
research.
Not all graphene and carbon nanotubes are semicondutors
how to intergrate them for device is another issue. |
|
m******a
发帖数: 154 | 40 本来我觉得graphene没啥搞头
不过看了Science上面 CVD长的cm大小的graphene
看来还是有搞头的
至少可以用了 |
|
|
s******x
发帖数: 15232 | 42 In a just-published paper in the magazine Science, IBM researchers
demonstrated a radio-frequency graphene transistor with the highest cut-off
frequency achieved so far for any graphene device - 100 billion cycles/
second (100 GigaHertz). |
|
f******n
发帖数: 72 | 43 转载自nanowerk
http://www.nanowerk.com/spotlight/spotid=14231.php
Posted: January 5, 2010
The rise of graphene in ultra-fast photonics
(Nanowerk Spotlight) A group of researchers from Singapore, led by Professor
Dingyuan Tang from Nanyang Technological University and Professor Kian Ping
Loh from National University of Singapore, reported the first breakthrough
in using few-layer graphene as a saturable absorber for the mode locking of
lasers. Despite its prominent mechanical and electrical properti |
|
b********e
发帖数: 158 | 44 【 以下文字转载自 Chemistry 讨论区 】
发信人: babymylove (牛牛妈), 信区: Chemistry
标 题: 请问哪里可以买到graphene？
发信站: BBS 未名空间站 (Sun Jul 15 15:28:43 2012, 美东)
朋友在国内想买graphene。说国内很贵。美国这里哪家公司可以买到呢？谢谢！ |
|
b********e
发帖数: 158 | 45 【 以下文字转载自 Chemistry 讨论区 】
发信人: babymylove (牛牛妈), 信区: Chemistry
标 题: 请问哪里可以买到graphene？
发信站: BBS 未名空间站 (Sun Jul 15 15:28:43 2012, 美东)
朋友在国内想买graphene。说国内很贵。美国这里哪家公司可以买到呢？谢谢！ |
|
u*****x
发帖数: 32 | 46 申请绿卡，审稿不够，还请多帮忙。
博士期间做了很多项目，涉及到graphene fabrication, surface engineering,
mechanical test of nanocomposites, nanoparticles/graphene hybrid,
thermoelectric materials.还与同事合写了solar cell和supercapacitor方面的研究。
曾经review了一些文章，涉及CVD CNTs, CNTs composites, bucky paper, thermal
transport fiber等方面的文章。经验还算丰富，回复速度快。
对你的推荐我将十分感激!谢谢！
联系方式：站内或c********[email protected] |
|
S*******d
发帖数: 35 | 47 求审稿机会： Graphene, 2D TMDc 材料，拓扑绝缘体(Bi2Se3)/黑磷（BP) 等
为了NIW， 楼主真诚寻找Review的机会。
本人是UC Berkeley的一名postdoc，物理背景出身，在材料特性和器件输运方面的研究
已有8年时间。
博士的研究从事于graphene(quantum transport,detector,Raman, plasmonic etc),
spintronics( spin injection,detection, spin hall effect etc)研究.博后目前从
事于topologic insulator( Bi2Se3/Bi2Te3),valleytronics( TMDc 2D 材料，2D
heterostructure), Black phosphorus等方面研究。
楼主已有8次审稿（ACS，RCS,AIP,ELSEVIER 等期刊），一般7天之内给出审稿意见。从
来没有直接拒掉文章（博士老板的影响），总是提出自己的意见和建议，给别人一个修
改的机会。
有12篇paper发表，现寻求审稿机会。如有相关的revi... 阅读全帖 |
|
S*******d
发帖数: 35 | 48 求审稿机会： Graphene, 2D TMDc 材料，拓扑绝缘体(Bi2Se3)/黑磷（BP) 等
为了NIW， 楼主真诚寻找Review的机会。
本人是UC Berkeley的一名postdoc，物理背景出身，在材料特性和器件输运方面的研究
已有8年时间。
博士的研究从事于graphene(quantum transport,detector,Raman, plasmonic etc),
spintronics( spin injection,detection, spin hall effect etc)研究.博后目前从
事于topologic insulator( Bi2Se3/Bi2Te3),valleytronics( TMDc 2D 材料，2D
heterostructure), Black phosphorus等方面研究。
楼主已有8次审稿（ACS，RCS,AIP,ELSEVIER 等期刊），一般7天之内给出审稿意见。从
来没有直接拒掉文章（博士老板的影响），总是提出自己的意见和建议，给别人一个修
改的机会。
有12篇paper发表，现寻求审稿机会。如有相关的revi... 阅读全帖 |
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b******o
发帖数: 110 | 49 最近的进展差不多是
在copper上面可以长出大面积单层graphene
100GHz graphene transistor
top gate技术越来越成熟
functionalize据说有突破 |
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m**n
发帖数: 9010 | 50 这玩意儿比graphene差远了.
我贬graphene, 带点个人原因 - 是因为这东西我做不了.
但公平的来说, 铁基超导只不过是给死气沉沉的高温超导打了个强心针而已.
Tc上不去, 几年下来就不热了. |
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