x5
发帖数: 27871 | 1 拿到了察察CdSe cell的电压，重新装一下meter啥的，也许是小毛病
不成再送修好了 |
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v******a
发帖数: 45075 | 2 ft to death, 三联的, 79-98, 3-CDse t
哪位高人有能不能mail我一个. :(
booooooooooooooooooooooooooooooooow |
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T****i
发帖数: 2190 | 3 不管single还是couple，都happy
Image interpretation:
This is a High Angle Annular Dark Field (HAADF) image taken on a Scanning
Transmission Electron Microscope (STEM). This technique can provide sub-
angstrom spatial resolution and single atom sensitivity. The nanoheart is a
twined, oleic acid-capped, CdSe nanocrystal, ~5.5nm in diameter. |
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a*********a
发帖数: 3656 | 4 retail arms and institutional/internal trading arms in a bank have totally
different mentality.
I never worked retail. but I have good confidence it is fine if a quarter
million retail customers cannot log in and see their credit card balance.
the bank looses no money when that happens as long as it does not happen
every day.
retail brokerage has lower tolerance but it is still perfectly fine if a
retail customer had to wait for a few seconds to fill a stock order. again,
the bank looses nothing... 阅读全帖 |
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k***i
发帖数: 662 | 5 By combining two types of semiconductors, the team has made solar cells that register as much as 3% power efficiency. By pairing materials that differ by just the right amount in the energy levels of their valence and conduction bands, in this case CdTe and CdSe nanorods, Alivisatos' group demonstrated that they could eliminate the organic polymer from the hybrid devices and make robust, all-inorganic solar cells using low-tech wet chemistry methods (Science 2005, 310, 462). And just last month, |
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z*****i
发帖数: 23 | 6 The Quenching of CdSe Quantum Dots Photoluminescence by Gold Nanoparticles
in Solution
Nikoobakht, B., Burda, C., Braun, M., Hun, M., El-Sayed, M.A.
Photochemistry and Photobiology 2002, 75 (6), pp. 591-597
thanks. |
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j******0
发帖数: 258 | 7 Title: Selective gas nanosensors with multisize CdSe nanocrystal/
polymer composite films and dynamic pattern recognition
Source: Applied physics letters [0003-6951] Potyrailo yr:2006 vol:88 iss |
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s********n
发帖数: 235 | 11 Title: INVESTIGATION ON FREQUENCY-DEPENDENCE OF IMPEDANCE OF NEARLY IDEALLY
POLARIZABLE SEMICONDUCTOR ELECTRODES CDSE, CDS AND TIO2
Author(s): DUTOIT EC; VANMEIRHAEGHE RL; CARDON F; et al.
Source: BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume: 79 Issue: 12 Pages: 1206-1213 Published: 1975
many thanks!
x********[email protected] |
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a*******c
发帖数: 48 | 13 很激动，竟然有人讨论俺的专业。俺也贡献一些消息把。
有没有包子阿？？
My PhD was basic on a-Si solar cells.Actually a-Si solar cell is already in
production now.Company already made money by selling a-Si solar pannels.
It has more advantage comparing pure c-Si.
GE and BP are not big players at all in solar cell industry.
United Solar is the best industry in a-Si solar cells.
First solar is also very good at CdSe/CdTe solar cells.
AMT only works on tandem cells.And they do not have good R&D group.
It is very promising to stay in s |
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a*******c
发帖数: 48 | 14 aSi/ncSi is very popular now.Many groups are working on that.
I do not know too much about First solar ,because they are working on
CdSe/CdTe.And they did not tell anything about their technique. But I heard
they are good.
Sunpower are working on c-Si,and it is still a start up company.
United solar is the best until now in silicon industry.They have very
strong R&D group,but only hire citizen.
I do not know any one transfer from solar cells to traditional devices.I
only know that
lot |
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L****a
发帖数: 572 | 15 Indeed, it's a very exicing area and industry.
Yes, united solar is the best company in the a-Si thin-film area,
because the founder of ECD, which acquired united solar a few years back,
is the pioneer of a-Si material. At this moment, United solar is the only
company who can make triple-junction a-Si thinfilm solar cell on stainless
steel substrate.
First solar is currently the only player in CdSe/CdTe, nobody else can
make CdTe thin-film solar in large scale. The process technology is First
so |
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a*******c
发帖数: 48 | 16 Exactly.In United Solar,they at least work on this triple juntion 10 years
agon until they got profit recently.They have the highest efficiency as
triple junction.Their R&D group is very strong.
First Solar can reach at least 10% on CdSe/CdTe in production.They are the
best in this solar cells.And they did not talk at all.
AMT is not R&D company.They are making PECVD system,so I do not think they
are so focus on efficiency. But they still have pretty high efficiency on
their tandem cells in lar |
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t***3
发帖数: 100 | 17 本人创建了一个太阳能交流群 46265152
希望所有与太阳能研究（c-Si, p-Si III-VI, CIGS, CdSe, polymer and nano et
al) 相关的朋友加入，大家一起分享资源，交流心得，共同提高！ |
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c*s
发帖数: 2145 | 18 发信人: titanz (天石), 信区: NanoST
标 题: 半导体禁带宽度
发信站: 瀚海星云 (2004年05月01日14:05:41 星期六), 站内信件
IV族：
Si 1.119
Ge 0.6643
SiC 2.6 or 2.994 （2.6好像是闪锌矿的）
III-V族：
AlP 2.45
AlAs 2.9(直接带隙）
AlSb 2.218（直接带隙）
GaP 2.26（间接带隙）
GaAs 1.424
InP 1.34（直接带隙）
InAs 0.356（间接带隙）
II-VI族：
ZnO 3.2
ZnS 3.6(闪锌矿）
ZnSe 2.58（闪锌矿）
ZnTe 2.28（闪锌矿）
CdS 2.53
CdSe 1.74
CdTe 1.50（闪锌矿）
IV-VI族：
PbS 0.42
PbSe 0.29
PbTe 0.32 |
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c*s
发帖数: 2145 | 19 this time, it would be cdse, cdte, hehe |
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c*s
发帖数: 2145 | 20 I am not sure what you mean by "arm"
If I understand correct, the arm is relative new research topic.
check Alivisatos and Peng's paper in which they made armed CdSe NPs
For metals, I did not see any repot so far.
-SH should be OK.
funding?
pose
let
X |
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f**********e
发帖数: 236 | 21 I would not believe QDs like CdSe can ever be used for real "in vivo"
applications, no matter how well you cap it. So the issue is the material of
the nanoparticle core, not the ligands (arms) aroud it. People have been able
to make sort of biocompatible nanoparticles by incorpting PEG and peptides
onto nanoparticle surface, but still there is no way to make them intact in
physilogical conditions for a long time. Nanoparticles with gold or silica
cores are more likely to be used for real in vivo |
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f**********e
发帖数: 236 | 22 Do not get me wrong. First, my point is the danger of gold or silica is lower
relatively to CdSe. Who wants degraded Cd in the body? Secondly, the
nanoparicles are not necessarilly "non-degradable". With certain coating, they
might be able to be cleaned out by the body. Or they can be destoryed at
centain conditions, like low pH, high reductive conditions, etc. If they do
get degraded, Au or Si moieties are certainlly less toxic than Cd or Se or Hg
or Td. Anyway, I am not optimistic that metal |
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c*s
发帖数: 2145 | 23 quantum dot, CdTe or CdS@CdSe, The reported quantum yield could be as high as
85%.
If these particles could be proved stable against o\photo or some chemical
enviroment, the results will be significant. |
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c*s
发帖数: 2145 | 24 前几天在加拿大化学年会( csc)上聆听了xiaogang peng的报告
题目是半导体那米晶的合成
总体上没有什么新的东西， 如果经常跟踪他的工作的话， 基本上他所讲的都在发表过的
文献里。感觉澎同学很实在， 回答问题很明确， YES OR NO，本来可以猜想的问题， 他
就回答不知道。
膨同学穿的比较土， 偶怀疑他的裤子是从国内带来了， 深蓝色， 周周八八， 还有点掉
色。 他的报告是下午1点20分， 上午分会主席说， 他可能会晚来一些，
可是下午1点15分， 他拎着箱子来了， 说刚下飞机。
小刚重点将的是那米晶体的稳定性， 特别提到， 1998年两篇那米晶生物运用的文章，
说当时有上百的小组都在FOLLOW这个工作， 但是都不是很成功， 原因在于， 那米晶的
稳定性(从油相转移到水相的过程中)不好。
由此， 他介绍了他最近的工作， 也就是用DENDRON分子包覆CDSE， 然后把DENDRON的外
围交联，成功的阻止那米粒子的光氧化。同时赋予那米粒子水/油的溶解性。
小刚非常自信的说， 他们找到了一些制备均分散那米粒子的普遍规律。
报告中有意思的几个镜头。 开始他现说了来加拿大的 |
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c*s
发帖数: 2145 | 25 they are so beautiful under UV light |
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h**u
发帖数: 133 | 29
1. 纳米材料，现在最热门
2. 可以取代某些荧光染料 |
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C**e
发帖数: 97 | 31 【 以下文字转载自 Michigan 讨论区 】
发信人: CdSe (石头), 信区: Michigan
标 题: 请Umich的朋友帮个忙
发信站: BBS 未名空间站 (Thu Mar 15 23:54:58 2012, 美东)
我需要看一下一本IET digital library的书。能否帮我下载一下？ |
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R***c
发帖数: 648 | 32 【 以下文字转载自 Macromolecules 讨论区,原文如下 】
发信人: xmo (惭愧中), 信区: Macromolecules
标 题: 我非常喜欢的几篇文章(nano related)
发信站: The unknown SPACE (Sun May 12 13:30:12 2002), 站内信件
Bawendi 1993年的JACS,合成和分离得到单分散的CdS,CdSe等,
作者工作做的非常的全面,阐述非常清晰,以后很多纳米颗粒的
合成方法都是从他那里derive的. 该文被引用了746次
Alivisatos 1996 Science,感觉是一篇feature article,指出
了纳米以后的发展方向 被引用了748次
Mirkin 96年的Nature, Assembly based on DNA.也算是号称
开创了一块新领域.
合成方法都是从他那里derive的. 该文被引用了746次
Alivisatos 1996 Science,感觉是一篇feature article,指出
了纳米以后的发展方向 被引用了748次
Mirkin 96年的Nature, |
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y***e
发帖数: 6082 | 33 一、纳米组装体系的设计和研究
目前的研究对象主要集中在纳米阵列体系；纳米嵌镶体系；介孔与纳米颗粒复合体系
和纳米颗粒膜。目的是根据需要设计新的材料体系，探索或改善材料的性能，目标是为纳
米器件的制作进行前期准备，如高亮度固体电子显示屏，纳米晶二极管，真空紫外到近红
外特别是蓝、绿、红光控制的光致发电和电子发光管等都可以用纳米晶作为主要的材料，
国际上把这种材料称为“量子”纳米晶，目前在实验室中已设计出的纳米器件有Si-
SiO2
的发光二极管，Si掺Ni的纳米颗粒发光二极管，用不同纳米尺度的CdSe做成红、绿、蓝光
可调谐的二极管等。介孔与纳米组装体系和颗粒膜也是当前纳米组装体系重要研究对象，
主要设计思想是利用小颗粒的量子尺寸效应和渗流效应，根据需要对材料整体性能进行剪
裁、调整和控制达到常规不具备的奇特性质，这方面的研究将成为世纪之交乃至下一个世
纪引人注目的前沿领域。纳米阵列体系的研究目前主要集中在金属纳米颗粒或半导体纳米
颗粒在一个绝缘的衬底上整齐排列的二维体系。
纳米颗粒与介孔固体组装体系近年来出现了新的研究热潮。人们设计了多种介孔复合
体系，不断探索其光、电及敏感活性等重要 |
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y***e
发帖数: 6082 | 35 哪有这么夸张，我CdSe,CdTe,Cd/ZnS的一个系列都做过，干法需要dry box我没有，所
以用的湿法，很简单，Pengxiaogang的早期JACS说得很详细，毒性这东西，我还真最怕
苯及其苯系物这种有机溶剂，其他化学实验室的哪个东西没啥点毒性，注意hood操作，
带好手套眼就好了，我在做QD的时候最怕的就是做ZnS外壳的时候那个[(CH3)3Si]2S这
个玩意，剧毒，极臭，俺第一次用的时候不知道，还在hood里面打开的，不到10s整个
lab都问道了，而且觉得恶心，被骂死了，这些都是三年前得故事了
了【 在 airways (You Will) 的大作中提到: 】
这些都是管制的，我的公司如果想做这些东西，要写安全措施的，还要在单独开辟一个
隔离室，所以没人做这些 |
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c*s
发帖数: 2145 | 36 this is really a piece of interesting work.
Horst Weller has been working quantum dots for more than a decade. It is
interesting in many aspects:
1. the crystalline corelation between CdSe and the nanotube substrate
2. the electronic structure of thus composite, the bad gap with the fermi
level of CNT, which may lead to some novel properties
3. how thus modification of CNTs will change their dispersity?
I did not read the paper, however, as long as the water or oil dispersity of
the composite is |
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x********8
发帖数: 167 | 37 嗯
挺有意思.以前我也做过硫化铬在CNT上的组装,也讨论了这个金字塔形貌,不知道这篇文
章引用了没有,呵呵.去年好像也有一片文章,记得是韩国人写的,也有类似的现象.大概
搞理论的人可以研究一下为什么会存在这个晶体生长模式.
把半导体组装到CNT上就是为做太阳能电池做准备,但是硫化物和CdSe太毒,估计搞研究
可以.KAMAT用氧化钛粘到CNT上,发了一篇NANO LETTERS,上了新闻.ACS NANO又搞一篇,
我刚打印出来,还不清楚是否有什么新进展. |
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x********8
发帖数: 167 | 38 我读的文章多是如果电荷转移的话，那么荧光必定要减弱或者消失，其原因是长时间分
离的电子和空穴多以非辐射的方式将能量弛豫掉，当然还有因为能量转移的机理而形成
近红外的发射峰。今天看到一篇文章，说是电荷转移导致了新的近红外荧光。我看了看
作者的讨论，但是还是没有读出他们在说什么，或者说根本没有说清楚这个新发光峰的
来源。我没有研究过硫属半导体纳米粒子，好像国内的高明远教授在这方面做了很多工
作。熟悉这个领域的不妨说说话。
Nanorod Heterostructures Showing Photoinduced Charge Separation
Sandeep Kumar, Marcus Jones, Shun S. Lo, Gregory D. Scholes
Small，2007, 3, 1633.
我自己想了一个机理，猜测啊，CdSe是A分子，CdTe是B分子。光激发以后两者都形成
激子，但是随之B分子的电子要跑到A分子导带上去，A分子的空穴要转移到B分子上去，
如此解释了A，B两分子荧光淬灭的现象。最后A分子上的电子能和B分子上的空穴复合发
出新的荧光，是什么因素导致这个复合过程 |
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n*****n
发帖数: 6 | 39 对于宽带隙的Si等半导体，多激子没什么用，例如纳米si，带隙1.0eV左右，
只有吸收能量大于3.0eV的光，才能才生多个激子，这样应用的意义已经不大。
其他带隙小的PbTe,PbSe等，在太阳能里面稳定性不好，容易光氧化。
只要把不同带隙的半导体，例如，TiO2，ZnS，CdSe，Si，PbSe,PbTe
等做一个激光喇曼就知道他们的稳定性如何了。 |
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q********o
发帖数: 63 | 40 2-6族半导体中,CdSe和CdTe QD的光稳定性确实太差了.
光伏的应用不清楚,但做光显示的话,其寿命相对于应用的指标差的太远了 |
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n*****n
发帖数: 18 | 42 能买到PbTe吗？好像没听说那个公司买呀。
取决于用途， 高纯度的是非常关键的对于器件构造。
可以google 一下 |
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P********n
发帖数: 372 | 45 免费的要不？不过要算collaboration的。。。呵呵 |
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s**e
发帖数: 165 | 46 可以啊，collaboration没有问题，呵呵。请给我站内发信。 |
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d*****8
发帖数: 3 | 48 四川鑫炬矿业、从事CDTE研究和合成已有十年经验。可探讨。电话028-85745581 丁先
生 |
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m*********s
发帖数: 1188 | 50 In terms of quality, buy from Invitrogen. I was told by the CEO of qdots
company. Invitrogen got the technology from Alivisatos's group.
But to support Chinese companies, please buy from www.oceannanotech.com or
from NN-lab.com. These two were split from the same company in ~4 years ago.
Now OceanNanoTech is developing better, they even hired more PhD last
summer (not me). |
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