d**a
发帖数: 3715 | 1 看你是什么样的pdms了.
如果是 photo curable的, spincoat正好,
如果是thermal curable的 Sylgard 184 或者 T2, 不知道spincoat之后,在cure的过程
中会不会有wetting-dewetting的问题.如果温度足够高,cure的够快的话,应该可以避免
.没试过.
如果你的PDMS是 non functional的,那你为什么到spincoat? |
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t***o
发帖数: 127 | 2 my pdms is non functional, i spincoated that to study its rheological
behavior as a ultrathin film by itself and with filler later.
it seems it didn't work since it just won't spread no matter the
hydrophobicity of the subphase. I guess it is just not viscous enough?
could u educate me a little more in this spincoating case?
thank you very much. |
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s****e
发帖数: 2934 | 3 最近用一个，室温下结晶微热变成粘稠的液体的小分子作sipincoating，这个粘稠的液
体不能wet substrate，10%的溶液也不能wet substrate，用50％的浓度的溶液倒是可
以（奇怪）。解决不了在spincoating过程中后期结晶的问题。微热会使溶剂蒸发，结
果也不能wet substrate。有哪位能给点建议的？多谢了。 |
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s****e
发帖数: 2934 | 4 ☆─────────────────────────────────────☆
singye (温润如玉) 于 (Wed Sep 20 13:02:40 2006) 提到:
最近用一个，室温下结晶微热变成粘稠的液体的小分子作sipincoating，这个粘稠的液
体不能wet substrate，10%的溶液也不能wet substrate，用50％的浓度的溶液倒是可
以（奇怪）。解决不了在spincoating过程中后期结晶的问题。微热会使溶剂蒸发，结
果也不能wet substrate。有哪位能给点建议的？多谢了。
☆─────────────────────────────────────☆
monzonite (Monzonite) 于 (Tue Sep 26 13:40:17 2006) 提到:
MIBK has low surface energy (24 dyne/cm). Toluene is about 28, similar to
xylene. They have meidum boiling points and vapor pressure |
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t***o
发帖数: 127 | 5 因为pdms tg太低，低分子亮的在常温下，几乎是fluid。我不知道可否做spincoating。 |
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s****e
发帖数: 2934 | 6 居然在这里又讨论起spincoating来了，我给你讲了我的样品的细节你还没给我解答呢
！我说spincoating 讨厌的问题主要是monzonite描述的问题，dust。另外我对
adhesion，polarity和surface energy的问题也理解的不透，正在讨论中，等wonder上
来说话。dip coating不是不如spincoating质量好吗？dip coating和spincoating有啥
区别啊？你给讲讲？ |
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S*****n
发帖数: 6055 | 7 类似的图案我在PS/PMMA共混薄膜里面就见到过，呵呵
机理很难讲，有人把他归因于spincoating中溶剂挥发的过程对相分离的影响
不过不知道你的膜是否是spincoating作出来的，呵呵
是
的
同 |
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x*******6
发帖数: 994 | 8 Please contact recruiter directly.
#1) One of my longest-standing clients has just received a $31 million
round of Venture Capital funding and is aggressively expanding, hiring
multiple positions for world-class CMOS semiconductor engineers. The
company is a leader in the field of next-generation nonvolatile memory and
is now working with a number of major customers, Their innovative memory has
the potential to replace both flash and DRAM. This is a chance to work on
leading-edge, advanced no... 阅读全帖 |
|
m******l
发帖数: 190 | 9 spincoat 堆积的不是十分紧密吧。 继续求简单易行效果好的方法。 |
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w********h
发帖数: 12367 | 10 recommend one book:
Soft Materr Physics
(M. Daoud, C. E. Williams eds.)
The first chapter (Droplet: Cappilary and Wetting)
was written by F. Brochard-Wyart.
I just glanced over that,
he mentioned your spincoating problem.
I didn't go to details. you check that..
似
spin-coated |
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m*******e
发帖数: 119 | 11 MIBK has low surface energy (24 dyne/cm). Toluene is about 28, similar to
xylene. They have meidum boiling points and vapor pressure. Low boiling
point and high vapor pressure allow the solvent to evaporate very quickly,
which may help to reduce crystalization effect in your film. But the problem
is that you might not be able to get nice uniform film due to high
evaporation rate. You can check other solvents that you can find. The
physical properties of the solvents can be found from Belstein da |
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M*********2
发帖数: 549 | 12 Use HMDS treat silicon wafer first. It may help.
such
substrate |
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s****e
发帖数: 2934 | 13 Thank you very much for your comprehensive information!
I need to measure electric properties of my compound, so a thin layer of
PMMA is not ok for me. My compound is also a silicone compound, which is a
nonpolar. I have tried xylene, toluene, hexane, THF, ether. For xylene and
toluene, only 50%-40% can fully wet the wafer before I spin the spinner. So
all the other concentration can not fully wet the surface, everything is
gone when spin for 2mins at 1500RPM. For the 40% one, crystalline is big |
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s****e
发帖数: 2934 | 14 呵呵，多谢了。哪些solvent是low surface energy的啊？ 我不能加其他的东西，我要
测film的很多性质。
such
substrate |
|
m*******e
发帖数: 119 | 15 MIBK has low surface energy (24 dyne/cm). Toluene is about 28, similar to
xylene. They have meidum boiling points and vapor pressure. Low boiling
point and high vapor pressure allow the solvent to evaporate very quickly,
which may help to reduce crystalization effect in your film. But the problem
is that you might not be able to get nice uniform film due to high
evaporation rate. You can check other solvents that you can find. The
physical properties of the solvents can be found from Belstein da |
|
s****e
发帖数: 2934 | 16 呵呵，多谢了。哪些solvent是low surface energy的啊？ 我不能加其他的东西，我要
测film的很多性质。
such
substrate |
|
m*******e
发帖数: 119 | 17 If possible, try toluene or MIBK (methyl isobutyl ketone) |
|
s****e
发帖数: 2934 | 18 silicon is high surface energy, but it will be oxidized to SiO2, then the
surface energy becomes lower. Could you tell me what kind of solvent is low
surface energy? Yes, you are right, I did find that high concentration
dewetting slowly and gave me thicker film. But I need a film like 500nm
thick...
such |
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s****e
发帖数: 2934 | 19 ☆─────────────────────────────────────☆
singye (温润如玉) 于 (Wed Nov 8 17:11:35 2006) 提到:
wafer都得现洗现做，不然铺出来的film就很丑。昨晚洗的wafer今天就不行了。神啊，
给我一个clean room。。。。
☆─────────────────────────────────────☆
nomos (秩序) 于 (Wed Nov 8 17:34:54 2006) 提到:
surface plasma不能清洗么
☆─────────────────────────────────────☆
DigitalPig (我需要的是实干) 于 (Wed Nov 8 21:22:50 2006) 提到:
那个不是洗得吧。。。 好像是表面引发作用的。。。
我反正知道我们组dip-coating的时候都是拿1:3双氧水：浓硫酸洗得，最后一步在
cleaning room
☆─────────────────────────────────────☆
Digital |
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s****e
发帖数: 2934 | 20 我的spincoating的经验也不多，我们一般都是coat正方形的slide，而且整个都滴上液
滴。
“但发现，若只在slide几何中心滴上少量溶液，低速或者高速下都无法保证长轴方向
充分coating”这个做法不对吧。我看别人做用正方形的slide中心滴上可以得到充分coating，但如果你的长轴太长恐怕不行吧。
第一不知道polysine是啥？粘度如何？用了什么溶剂？所以不知道为啥会分层。你说的
分层是不是意思是看起来像梯田一样？你尝试了不同浓度粘度的溶液吗？尝试了不同的
溶剂和转速吗？ |
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s****e
发帖数: 2934 | 21 如果测大的样品就用模子压那种两头宽中间细的样条，直接用杨氏模量的仪器拉断样条。如果是小的样品就用spincoating。总之膜的厚度要均匀。可以用SAWS和nanoindentation的方法来测。SAWS
可以测薄的样品，薄到150nm，要测膜的厚度和密度。nanoindentation测厚一点的样品，可以到1um。还有一个叫fracture energy的Gc，这个参数加上stress modulus和young's modulus就
可以表征薄膜的机械性能了。
hardness有好几种，其中一种是用diamond在材料上划一道口子，看口子的深浅，还有一种是Indentation hardness，顾名思义就是压一个口子。这2种都是对于bulk的样品来说的。
所以那种随便用溶剂浇一个膜的俺木有听说过，不是很清楚。 |
|
c******h
发帖数: 4573 | 22 我知道那种dogbone样条
我们做杨氏都是普通cast film然后再用模子把膜切成dogbone形状
所以我看你说做杨氏模量不能用在玻璃板上cast的film想问问应该怎么制备膜
条。如果是小的样品就用spincoating。总之膜的厚度要均匀。可以用SAWS和
nanoindentation的方法来测。SAWS
品，可以到1um。还有一个叫fracture energy的Gc，这个参数加上stress modulus和
young's modulus就
有一种是Indentation hardness，顾名思义就是压一个口子。这2种都是对于bulk的样
品来说的。 |
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