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g***y
发帖数: 4784 | 3 那样子的话，肯定用HF了
大概是去掉,可能用作模板了. |
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o*********y
发帖数: 17 | 6 NaOH solution also is OK |
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x********8
发帖数: 167 | 7 这里似乎不容易把图片拷过来，原文可以见博客：http://www.sciencenet.cn/blog/user_content.aspx?id=6815
科学网前几天发布了一个科学新闻：《ACS Nano：最新研究定量确定碳纳米管电学性质
》。由于ACS Nano是又一个纳米期刊新贵，加上对于纳米管的电学性质也颇感兴趣，所
以好好拜读了这篇文章。另一方面对于能上科学新闻的工作，必定是一些大的实验和理
论突破，所以心里一般也崇拜有加。不过有的时候也有意外，如报道《《先进材料》－
王中林江鹏解思深蔡伟－异质结环研究》就让我们这些搞所谓材料的不解。我想老王同
志最近两年研究纳米终于从形貌结构研究转型到功能化研究，理当对什么新颖结构之类
不再感冒了吧，如何还带着一帮中国人在这个领地上狂灌水，而且还是在《advanced
materials》上灌水，真是让人迷惑不解。老王现在是国家纳米中心主任吧，带领大家
搞点有用的好不好。您在top期刊上整一些nanowires，nanobelts什么的，对国内纳米
研究影响很大，现在国内一提到纳米就想着做这些花里胡梢的东西，没有往深处搞过。
日本JEOL公 |
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x***u
发帖数: 13 | 9 想用ZnO nanowire array的压电效应来做force sensor，
NW的一端是固定在衬底上的，另一端是free的。
如果力从侧向加到NW上（垂直于NW的侧壁）
那么因压电而产生的正负电荷会分布在NW的侧壁上，
如何把这个电荷给导出来？
大家讨论一下吧。
如果电荷是分布在NW的两端，那倒可以在NW array的top free end上做个电极。在侧壁
上好像有难度啊。 |
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x********8
发帖数: 167 | 10 板栗外面一层皮衣带刺是我来到筑波才知道的事，这个完全可以写一篇文章批判一下吃
板栗觉得香的人居然不知道采板栗是多么一件不容易的事情。我不是纨绔子弟，出了这
样的事情完全要怪自然课本上没有提到这个事实，所以现在知道了可以释然，然后以后
可以教训别人：你就知道板栗好吃。。。
带刺是自然选择的结果，果皮内的板栗可以幸免于乌鸦的骚扰，从而生根发芽。但是根
据我的观察，大多数板栗的底部都会有一个虫洞，所以很多掉在草丛中的成熟果实都已
经没有发芽可能。现在正是板栗毛球炸开时刻，所以周末可以去所里几棵板栗树下溜达
一下。
转到正题，纳米板栗现在也上市了，请看最新ACS Nano上一篇文章，摘要如下。
nanowires同志在博客上通知了这篇文章，有人评论说好像没有什么很让人惊讶的结果
，我也赶快去看看。读过之后有三点收获：
1，作者们推翻了早先一个理论工作预言，即锐钛矿相（anatase）的氧化钛不可能长成
大晶粒，金红石相（rutile）一般才是热力学稳定态。当前工作结果发现控制成核生长
速度石可以得到较大单晶的锐钛矿相氧化钛。读者注意了，rutile这个单词虽然发音像
锐钛矿，但是确实金红石相的 |
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o*****d
发帖数: 4 | 11 补充一点，nanowire是没有NIR段的吸收的，纵向太长乐
因而一般都是长径比<5的nanorod有很强的longitudinal absorption. |
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C**********g
发帖数: 211 | 12 The nanowires inflate four times their normal size as they soak up lithium.
But, unlike other silicon shapes, they do not fracture. |
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s***l
发帖数: 149 | 13 小崔吹得太厉害了, 我来泼两瓢冷水(sorry in English)
while it might be an interesting observation, the cycling stability of his
nanowire would be a huge problem. For this stability problem, there is
little difference between bulk Si and his so called NW Si. (bulk fracture at 5th cycle,NW at 20th?) Another problem
with his NW anode is that since the Si anode would expand 4 times regardless
it is in bulk state or NW state, leaving space for expansion in the NW
state would means the packing amount would be at most |
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t****n
发帖数: 14 | 14 There are a few other nanobattery technologies on the market, such as the
following,
http://www.altairnano.com/markets_energy_systems.html
Except using silicon nanowire instead of Ti, I don't see anything new,
besides I'm not sure if Si is a better material for this application.
How is your take? |
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w******r
发帖数: 139 | 15 M. J. Zheng, L. D. Zhang, G. H. Li and W. Z. Shen, Fabrication and Optical
Properties of large-scale uniform zinc oxide nanowire arrays by one-step
electrochemical deposition technique, Chem. Phys. Lett. 363 (2002) p.123. |
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m*******r
发帖数: 481 | 20 It is unbelievable that Nature publish two papers back to back, with very
similar results. |
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t****e
发帖数: 329 | 21 上次做有序介孔锗的也是这样 两篇文章 一起发表 |
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p****n
发帖数: 109 | 22 It did happen a few times in the past. I vaguely remember one issue in 2005
had b2b articles on graphene |
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x*******2
发帖数: 5333 | 23 suggested my boss to do the same experiment about one year ago...
no go,sigh |
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x*******2
发帖数: 5333 | 24 but in last MRS meeting, a famous lady said fancy nanotubes are not the
right direction for TE materials |
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x*******2
发帖数: 5333 | 25 some people showed porous silicon has a high seebeck coefficient too. but it
only published on a IEEE conference i remember |
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s*******l
发帖数: 73 | 26 都Full Professor,照这架势,不久就NSA |
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i*****e
发帖数: 633 | 28 真没想到我也有这一天。。。
哪位碰巧知道CdS (最好是nanowire)的gain coefficient? 请不吝赐教。。。 |
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e******r
发帖数: 23 | 29 nanorib 很象nanowire的做法,似乎挺有应用前景的.... |
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r********n
发帖数: 149 | 30 Another Nature paper by Wang ZL
A new paper details how pairs of textile fibers covered with zinc oxide
nanowires can generate electrical current using the piezoelectric effect.
Combining current flow from many fiber pairs woven into a shirt or jacket
could allow the wearer’s body movement to power a range of portable
electronic devices. The fibers could also be woven into curtains, tents or
other structures to capture energy from wind motion, sound vibration or
other mechanical energy. The nano |
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s*******e
发帖数: 515 | 31 Yes, but not the carbon nanotube wires.
Personally, I don't think there is any future of CNT to make devices unless
people can grow it with a good control of size and alignment that is
impossible for the way chemist doing.
The only way now is engineering, using semiconductor lithography
techniques to make, i.e., Si nano wire devices that had been demonstrated.
..
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b****h
发帖数: 9 | 32 1)J Nanosci Nanotechnol. 2007 Aug ;7 (8):2774-7 17685296 (P,S,E,B)
Enhanced field emission from H2 plasma-treated alpha-Fe2O3 nanowires.
Feng Xu, Ke Yu, Qingyan Wang, Meirong Shi, Qiuxiang Zhang, Wei Bai,
Qiong Li, Ziqiang Zhu
链接：
http://www.ingentaconnect.com/content/asp/jnn/2007/00000007/00000008/art00026?token=00511e2f967891d60763654e6b63404f39412f415d4877257770557b6d7a417b4daf69fe0ca3054de
2）J Nanosci Nanotechnol. 2007 Sep ;7 (9):3301-6 18019164 (P,S,E,B)
Characterization and field emission |
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p********t
发帖数: 76 | 33 It is not easy to find a job in industrial area for sure. |
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w**********g
发帖数: 687 | 35 It is always depending on the area. |
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m*******r
发帖数: 481 | 36 No one answers, come on, some one come up to have some comment. Thanks a lot
. |
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m*******r
发帖数: 481 | 37 Besides that, are there any key parameters such as pressure and temperature
(I am talking about CVD) need to pay attention to? |
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f***8
发帖数: 571 | 38 jacs/nl对诸位水王同志也算不上什么特别的吧 |
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S***e
发帖数: 108 | 39 If they didn't find similar work have been done by other groups during
reviewing, it should be published on Science or Nature, or at least Nature
materials. Obviously they communicated with each other and meant to publish
online at the same time. |
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c*s
发帖数: 2145 | 40 这个系列的文章确实让人眼前一亮
publish |
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x*******y
发帖数: 15 | 42 Title: Large-scale synthesis and characterization of hexagonal prism-shaped
SiC nanowires
Author(s): Chen JJ, Yang GY, Wu RB, et al.
Source: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY Volume: 8 Issue: 4
Pages: 2151-2156 Published: APR 2008
Thanks a lot! |
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m*******r
发帖数: 481 | 43 Did anyone here notice another paper in Nano Letter using BaTiO3 nanowires
for energy harvesting from UIUC? This German group seems only attacking ZL
Wang's result, not the UIUC one. Any comment? |
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m*******r
发帖数: 481 | 44 yeah. I think for BaTiO3 nanowire case, the experiment and modeling are
already very convincing and self-consistent. after all, BaTiO3
piezoelectrcity is more than 10 times higher than ZnO. So the signal is much
higher. In ZL Wang paper, the time constant is really a big issue. In
BaTiO3 paper, the time constant is quite large. anyway, the experimental
setup and measurement are totally different. |
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m*******r
发帖数: 481 | 45 I think ultra small signal measurement is very tricky. Sometimes you just
got some fake or interference signals, rather than a big break through. I
heard many cases in nanowires measurement. Most of them have not been
exposed yet. hehe. |
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v*****m
发帖数: 66 | 46 ZL Wang hooyou too much on his nanowire shit.
Ulrich |
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e****d
发帖数: 110 | 47 nanowire忽悠成分是大些。不过Wang还是弄了不少好东东。
至于这个实验，对方确实也是大牛，Adv Mater一抓一把，不过到底如何还是要拭目以
待。
我重复那么多papers的工作，能重复的也就那门10之3，4.
wang不是号称他的工作发表前都要重复100次左右吗？ |
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y***e
发帖数: 6082 | 48 问题是100次重复error bar有多大？重复100次有点夸张但很多实验重复50次完全应该
，俺知道俺以前实验室那篇Science投稿前对于那个新现象和合成方法重复了3年
nanowire忽悠成分是大些。不过Wang还是弄了不少好东东。
至于这个实验，对方确实也是大牛，Adv Mater一抓一把，不过到底如何还是要拭目以
待。
我重复那么多papers的工作，能重复的也就那门10之3，4.
wang不是号称他的工作发表前都要重复100次左右吗？ |
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v*****m
发帖数: 66 | 49 Wang's group had lots of good paper on growing nanowire and making simple
devices. The things is everyone knows that harvesting energy is a good
deal. Wang jumped on it fast in order to dominate this field. Once he does
it, there are going to be lots of goodies, such as easy nature/science
papers, easy funding, .... That is drive force for his group to product
intentionally or unintentional manipulated or questionable data. |
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