NEW video on CVD graphene transfer here: • Large Scale CVD Graphe... staff.science.n... Ozyilmaz' Group, Graphene Research, National University of Singapore
We can use graphene for nanotubing technology ! If you sine light on graphene you get a C60 molecules which is buckyballs and if you put it through high voltage it forms some nanotubes where you can even fit buckyballs into. This will have great uses in nanotechnology !
Depends on your graphite flake thickness, 5 times at least is a good start. Optical microscope is always an excellent and fast indication of the number of layers and is hardly wrong. We do Raman frequently for verification in important expts and checking quality of graphene. We use white light source, but the prefered wavelength depends on your substrate.
Currently this is still the best way to obtain high quality graphene. Also, most of our experiment do not need very large graphene sheets. We are also developing in several areas, but I will not comment on them as they have not been refined yet.
Normally we do not remove the glue. For experiments that require clean surfaces, we will do the standard annealing in Ar/H2. We most frequently get sizes of around 30-50um.
The single layer graphene shown is about 10um in length. This is just a random position on the chip but it shows the contrast difference between each additional layer of graphene. As a guide, the height of the screen equals 100um.
Great tetrflare - great explanation! We at Lancaster have tried to use the same region of the tape but it seem that the new one has to be done. Oleg (Kolosov)
If you look closely, at the lower right corner there is a very faint outline connected to the purple area, this faint patch is graphene, and not the darker purple regions.
Assuming you are refering to number of layers, it depends on the person doing it. With practice, there should be at least a single or bilayer graphene on a 1cm by 1cm chip surface of size >20um. 3-4 points on a chip is most common.
@Tripbag scotch tape is the brand, and yes we know it is made by other companies. Just like kleenex are made by many different companies but we dont refer to them as tissue paper, we call them kleenex. It's not brain washing, it's a conscious decision.
graphene has the potential to bring integrated circuits down to the atomic scale. there are still other parts that need fabrication techniques, not to mention putting them togather. but this surely indicates the final stage of moore's law.
Size of bilayers should be similar to single layers. But personally i do not see many very large size bilayers, about >80um, as compared to single layer. I also forgot to mention that we generally tend to get many more long thin strips of graphene as compared to large area. I have obtained a 180um*10um long strip but only 100um*40um if you consider area. Even these are relatively rare.
@SweStuff94 Most steel already control the hardness by the percentage of carbon content. I'm sure graphene will improve the material strength, but there are considerations on the amount of graphene added and if heating will destroy the graphene by oxidation.
That does look like bilayer, though contrast on the screen is not as accurate as looking into the microscope. At the magnification, as mentioned previously, the vertical height of the image on the screen is 100um. Unfortunately, as this is a point on the chip used just for recording of this video and it was recorded long before I uploaded this here, I can't remember the details.
I wasn't sure I could do this experiment at first, then she got to the optical microscope and I breathed a sigh of relief, guess I'm not out of the game just yet!
In that video (1:40), the second lightest graphene, which is located in the main piece, seems to have an area 20times bigger than the monolayer. I take that to be the bilayer, I cannot tell what is the size of the parts because the scale was not given.
Pencil graphite is not crystalline and mixed with other impurities, so single graphene layers will not be on that size scale that is visible or usable.
What do you plan to improve your method? Or do you feel you already accomplished a way to make cheap graphene parts to experiments and is not interested in further development?
Hi tetrflare, We know that bilayer graphene has a great potential to electronics because of the existence of band gap on room temperature. What is the average size of bilayer graphene you get? What are the biggest sizes of bilayer graphene you obtain? Cheers.
whats the cost per gram ? How long does it take to make a gram using the scotch method ? Whats the most current most cost effective method of producing a consistent quality of graphine ? thx !
How do you know the graphene at lower right corner is single layer graphene...you are seeing both, at the centre and at lower right corner at same magnification and they look similar. Is there some kind of visual sign i am missing??
ok? now when i do this the tape cant all of a sudden hold the weight of an elephant like graphene is stated to be capable of? so tell me how this is the strongest material on the planet?? Also how does graphene stuck into layers become so much better than graphite which is graphene in layers anyway?? im very new to this concept but highly interested! plz reply!
Tape and graphite won the Nobel Prize in Physics, it's so funny to think about. Does anyone agree that Milestones within physics and chemistry actually has an indirect effect on world peace? I mean, medicinal discoveries within chemistry, will surely help alot more people than mister Obama did in 2009...
That's great! Graphene particles.. WooHoo! (but she left out the high-temperature annealing step, which without, you basically have a bunch of graphite dust stuck to some scotch tape.. not very useful).
ok...so and then what? is this just theoretical or its fact that this is the strongest material on the planet? any examples that we can see/watch about graphene stuff?
ok but the hard part is going to be to make a large sheet of it. then it will have lots of impurities and it will break easy. this is not going to work
no the microscopes you will have in highschool are around $2,000-$5,000, those ones arent even that good. An optical microscope are around half a million dollars. That's why you will only have them in universities or other research facilities.
@davetileguy Cross posting to new threads? Lol you must be desperate. Graphite flakes used in the video are soft, pencil lead is hardened prior to being placed in pencils, so no, it is not a #2 pencil.
Anybody got some clean Si wafer around....I need to find my graphene flake...and do some raman spectroscopy on it....oh wait......I DON"T EVEN HAVE ACCESS TO A LAB!!!
We can use graphene for nanotubing technology ! If you sine light on graphene you get a C60 molecules which is buckyballs and if you put it through high voltage it forms some nanotubes where you can even fit buckyballs into. This will have great uses in nanotechnology !
Depends on your graphite flake thickness, 5 times at least is a good start. Optical microscope is always an excellent and fast indication of the number of layers and is hardly wrong. We do Raman frequently for verification in important expts and checking quality of graphene. We use white light source, but the prefered wavelength depends on your substrate.
Currently this is still the best way to obtain high quality graphene. Also, most of our experiment do not need very large graphene sheets. We are also developing in several areas, but I will not comment on them as they have not been refined yet.
Normally we do not remove the glue. For experiments that require clean surfaces, we will do the standard annealing in Ar/H2.
We most frequently get sizes of around 30-50um.
The single layer graphene shown is about 10um in length. This is just a random position on the chip but it shows the contrast difference between each additional layer of graphene. As a guide, the height of the screen equals 100um.
Great tetrflare - great explanation! We at Lancaster have tried to use the same region of the tape but it seem that the new one has to be done. Oleg (Kolosov)
If you look closely, at the lower right corner there is a very faint outline connected to the purple area, this faint patch is graphene, and not the darker purple regions.
Graphene just got the nobel prize in physics!
@Zhumdal These are natural graphite flakes of high purity. Some groups use HOPG Kish graphite which should have higher purity.
@AmpleLight No, it's hardened for use in pencils
Assuming you are refering to number of layers, it depends on the person doing it. With practice, there should be at least a single or bilayer graphene on a 1cm by 1cm chip surface of size >20um. 3-4 points on a chip is most common.
@tetrflare yup,the black thing we usually use for pencil is a sample of graphite
@Tripbag scotch tape is the brand, and yes we know it is made by other companies. Just like kleenex are made by many different companies but we dont refer to them as tissue paper, we call them kleenex. It's not brain washing, it's a conscious decision.
graphene has the potential to bring integrated circuits down to the atomic scale. there are still other parts that need fabrication techniques, not to mention putting them togather. but this surely indicates the final stage of moore's law.
It is natural graphite flakes.
From the company, NGS Naturgraphit GmbH.
yoo i met this lady who does the voice over the summer. she presented all this data about graphene, and we got to see the stm, and how they look at.
As simple as this video is, it's better than the more complicated videos that don't even show how to do this clear enough🙄
Size of bilayers should be similar to single layers. But personally i do not see many very large size bilayers, about >80um, as compared to single layer. I also forgot to mention that we generally tend to get many more long thin strips of graphene as compared to large area. I have obtained a 180um*10um long strip but only 100um*40um if you consider area. Even these are relatively rare.
@SweStuff94 Most steel already control the hardness by the percentage of carbon content. I'm sure graphene will improve the material strength, but there are considerations on the amount of graphene added and if heating will destroy the graphene by oxidation.
Dangit, I thought I could do this at home until you showed us that massive microscope and expensive-looking computer. Dx
hehe relax. I don't think it meant "101" as in "101 for your home" but "101 for researchers". It did an excellent job at that.
That does look like bilayer, though contrast on the screen is not as accurate as looking into the microscope. At the magnification, as mentioned previously, the vertical height of the image on the screen is 100um. Unfortunately, as this is a point on the chip used just for recording of this video and it was recorded long before I uploaded this here, I can't remember the details.
@Grundalizer That is a graphite crystal.
Yes, but how we get a 10 x 10 cm single sheet graphene layer for battery electrodes ???
@atiqahdotcom Sellotape is a brand name too.
@hockart "Roll-to-roll production of 30-inch graphene films for transparent electrodes" in Nature Nanotechnology recently.
I wasn't sure I could do this experiment at first, then she got to the optical microscope and I breathed a sigh of relief, guess I'm not out of the game just yet!
Yes, it is regular Scotch brand tape.
In that video (1:40), the second lightest graphene, which is located in the main piece, seems to have an area 20times bigger than the monolayer. I take that to be the bilayer, I cannot tell what is the size of the parts because the scale was not given.
Size does not really matter, it can range from few mm to over a cm size flakes. The highest purity is recommended.
Pencil graphite is not crystalline and mixed with other impurities, so single graphene layers will not be on that size scale that is visible or usable.
Carbon is pretty cool.
omg its so simple... why didn't we think of this earlier
These guys should have won the Nobel prize in Macguyverology
What do you plan to improve your method? Or do you feel you already accomplished a way to make cheap graphene parts to experiments and is not interested in further development?
Looks cool.
Carbon nanotubes are created from rolled graphene. So yes this stuff is pretty freaking strong.
hold on let me get my silicon wafers and electron microscope real quick...
Let me just bust out my optical microscope. -_-
@tetrflare Plain graphite? Graphite oxide? Has it been treated with chemicals?
Carl Zeiss Axio Scope and AxioCam series.
Can you please suggest how can I get Scotch Tape that is suitable for exfoliation purpose?
@carinyuso Because G is Strongest material so that we can do it. otherwise We can not.
Axio Imager.A1M and Axio Cam MRc 5.
Hi tetrflare,
We know that bilayer graphene has a great potential to electronics because of the existence of band gap on room temperature. What is the average size of bilayer graphene you get? What are the biggest sizes of bilayer graphene you obtain?
Cheers.
whats the cost per gram ? How long does it take to make a gram using the scotch method ? Whats the most current most cost effective method of producing a consistent quality of graphine ? thx !
@vicquits Homer should have thought about it first, it would be nice to see him get a nobel prize... d'oh!
@atiqahdotcom People in the US say "Scotchtape."
wow, amazing.
That is super cool.
NOW MAKE A SPACE ELEVATOR OUT OF IT! :)
How do you know the graphene at lower right corner is single layer graphene...you are seeing both, at the centre and at lower right corner at same magnification and they look similar. Is there some kind of visual sign i am missing??
ok? now when i do this the tape cant all of a sudden hold the weight of an elephant like graphene is stated to be capable of? so tell me how this is the strongest material on the planet?? Also how does graphene stuck into layers become so much better than graphite which is graphene in layers anyway?? im very new to this concept but highly interested! plz reply!
Do you use a regular, off the shelf scotch tape or something else?
now proved it is strong!
Lol sweet, now i need $500,000 for an optical microscope and im sweet.
I meant we don't really have anything that demonstrates how strong this material is..
What was the starting black flake material?
okay... now how do i make this into a batman suit?
I was like, I can do this! And then she got to the optical microscope.
@AlchemistxBankai
YOU ARE A FUCKING GENIUS
Tape and graphite won the Nobel Prize in Physics, it's so funny to think about.
Does anyone agree that Milestones within physics and chemistry actually has an indirect effect on world peace? I mean, medicinal discoveries within chemistry, will surely help alot more people than mister Obama did in 2009...
Ok so how do I know it's the strongest material known to man? Can you make a bulletproof vest out of it?
@atiqahdotcom, the Americans, and we Canadians have been brainwashed by corporate branding, therefore referring to it as Scotch Tape.
nice
what was the wafer made of?
has anyone made an actual sheet like 10x10cm of solid, unbroken links of graphine?
Someone please help: where can I get those graphit flakes and the si wafer?
Lab only or some tech comps
yes....
good mark
That's great! Graphene particles.. WooHoo!
(but she left out the high-temperature annealing step, which without, you basically have a bunch of graphite dust stuck to some scotch tape.. not very useful).
ok...so and then what? is this just theoretical or its fact that this is the strongest material on the planet? any examples that we can see/watch about graphene stuff?
@Grundalizer Natural graphite, no treatment.
@TimeToWakeUpHasCome Its supposed to be the strongest material known to man.
lets see how strong they are. test that out.
Science !
@tetrflare "In Rod We Trust"
lol @ her being careful not to break graphene
I have brought the optical microscope but now i cant afford a bloody pencil :(
yeap. right
I can't see that withholding the weight of an elephant.
What is that wafer that she is talking about?
ok but the hard part is going to be to make a large sheet of it. then it will have lots of impurities and it will break easy. this is not going to work
no the microscopes you will have in highschool are around $2,000-$5,000, those ones arent even that good. An optical microscope are around half a million dollars. That's why you will only have them in universities or other research facilities.
@tetrflare
yay!!!!!!!!
@davetileguy Cross posting to new threads? Lol you must be desperate. Graphite flakes used in the video are soft, pencil lead is hardened prior to being placed in pencils, so no, it is not a #2 pencil.
goodddd
Anybody got some clean Si wafer around....I need to find my graphene flake...and do some raman spectroscopy on it....oh wait......I DON"T EVEN HAVE ACCESS TO A LAB!!!
i had asked my teacher in school, less than $1000
Yeah. Look damn near anywhere on the internet.
i gave up after hearing the optical microscope part
Wow, you can already buy graphene on eBay! Only $1000 per gram!
That's nanotubes...
dammit i havent got a university :(
Like what?
Cool. Now find a way to turn it into a weapon and we'll give you all the money you want
what is graphene and what can you do with it?
michio kaku sent me
sort of
ePRTN amen
i start the vid and think well this is easy.....then 1:20 ...... i dont have one of those
@PreApproved1 I'm sure that -_- face will turn into a ^_^ when you get your first graphene computer, it will be paper thin and will run super fast.