All-dry deterministic transfer of two-dimensional materials
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- Опубликовано: 16 сен 2024
- In this video we show how we can transfer an atomically thin layer of molybdenum disulfide onto a substrate with holes to fabricate a micron-size drumhead.
Links:
arxiv.org/abs/1...
onlinelibrary.w...
Hey, would you mind telling, how many times you thin the samples and how big was this sample? A rough idea is a great help. Also, are there some tips that you can let me know for makig graphene succesfully? While making them myself, I dont see thin flakes, just thick graphene flakes on the PDMS layer
Hi, I don't know if I could be accurate enough to explain the details of the exfoliation process. I've been planning to make a video for a long time, let's see if I find some time for it. The hole over which it's transfer it's 8um in diameter so you can get an idea of the dimensions.
Ah, I see. I have been trying over 2 weeks to get things layers, but unsuccessfully. Would be awesome if you make one!!! Thanks for your reply!
@@kalingvikramsingh I usually don't re-exfoliate much the tapes. I prefer to work with tapes with relatively bulky flakes. Then peeling off quickly from the Gel-Film to get lower density of flakes (I don't like stamps very crowded)
Hi, does peeling involve raising the stamp or is the PDMS retained on the substrate then peeled off with the tweezers? I have read your paper however I find this not explicitly stated. Thanks in advance
Hi, the PDMS peeling off is carried out by raising the stamp using the XYZ micrometer stage used to move the stamp. Lifting it up with tweezers would be (most likely) too fast to guarantee good and reliable transfers.
Hi, Thats cool,
How did you peel off the two under the microscope? When I do this experiment, the Si wafer is adhered onto the PDMS and I have to peel it off the stage. Thanks for your sharing.
I am not sure if I understand your question. The target substrate should be fixed to the XY+rotation stage with a double side tape (try Scotch restickable tabs) to avoid the substrate being lifted by the stamp.
Hi there, Many thanks for sharing this wonderful clip. Were you manually turning z of the micromanipulator or was it automated? The lift-up was very slow and stable and I am wondering how did you manage to do that. Although in this video the stamp was moving a bit, it was very minor and could be due to distance changing when in contact with the substrate. I have a setup but it vibrates quite a lot (several um) and I am not able to peel it off slowly. Many thanks.
It is manual. It is true that in that setup we used a very high quality xyz stage (see the part numbers in the supp. Info. Of the cited paper in the comment of the video). For this video we used the transfer setup described in the supp info. Is your setup similar?
@@STRENGTHNANO Many thanks for the rapid reply and great to know it is manual. I was thinking to update the x-y-z (especially z) stage into a automated style as I though the vibration was caused by adjusting the z manually. All said, our system is different (principle same). We have a microscope (x-y for substrate, a ceramic heater on the stage, no camera attached), a x-y-z manipulator (all metal, quite heavy) no breadboard. Due to the height mismatch, I have to fix the x-y-x stage to a metal post (with a metal base) which stands on a normal lab table, along side with the microscope. No screws or glue to the metal base. I suspect the vibration was from the metal post. It seems stable but in a micro world definitely not. I can make the Van der Waals heterostructures but the vibration or shift bothers me as it might cause damage to the thin flakes, apart from misalignment. Any suggestion is appreciated. We have a budget but not much,£2-3k.
@@PL-cf3sc from your description it seems that you have a long mechanical pathway. This is troublesome for the mechanical stability. We started using a very similar geometry (see the main text figures of the cited paper) and we shifted to a different geometry (the setup discussed in the supp. Info.) which solved many of those issues. We have now two versions of that setup one that is around 3-4 kEur and another one that it is under 900 Eur (limited optical resolution, but good enough for many works) let me know if you want further information
@@STRENGTHNANO Many thanks. I should have read this paper in more details. Could I have a list of parts for your both versions? I am using a normal x10 and a x50 long distance objectives. All seem OK without a stamp. However, once a stamp is above the substrate, image becomes bit blur under x50 one, which is another challenge for alignment, especially when the flakes are not very large. Many thanks for your time.
@@PL-cf3sc write me an email and I will send you the part number lists (they are published in two recent publications) Google my name and look for my CSIC.ES email account
Hello It's wonderful. How you see the real image in your pc is there any software you choose?
I have ordered the same components that you mentioned in your paper. So can you help me to assemble the things?
In this setup we used a Canon EOS 1200D. Most of the time we used the cam directly connected to a TV screen with a mini HDMI connector. But it is possible to connect this model to a PC. In the latest Canon models I think (not sure) it is possible through WIFI not USB.
In this particular case we directly saved the video to a SD card
@@STRENGTHNANO Where we find the canon to F-Mount adapter ?
It means canon to nikon F-mount adapter?
@@STRENGTHNANO In the Nikon camera F-mount is already in build so we can use that one?
@@danikivines2388 I bought it on Amazon or eBay it's relatively standard
What tool is used for making the alignment of the flake?
The setup employed is described in detail in this publication:
Andres Castellanos-Gomez et al 2014 2D Mater. 1 011002
An open access version can be found at:
arxiv.org/ftp/arxiv/papers/1311/1311.4829.pdf
(Take a look to page 22 for a description of the different components of the setup)