Brilliant explanation. Very easy to follow and understand. I have a question regarding the crystal sensor used for thickness monitoring. How and how often the deposition of metals on the crystal sensor is cleaned or removed? Is it an automatic or manual process?
Seriously wow... please make complete playlist on nanotechnology..... thank you Nd all the best..Hope every university can teach and demonstrate like you
This video is just part of a full Coursera course on nanotechnology. Check out the link that is mentioned at the beginning of this video or search for the Duke Nanotechnology course on Coursera.
Very interesting presentation. The elegant gestures brought attention to the subject, and were a welcome addition. How do you calibrate the deposition thickness sensor? How do you determine the film thickness? Is there a separate meteorology session that covers it? I assume there may be a process to recover the gold from the chamber walls? The target showed sign of multiple deposition cycles. Even nanometers add up to $$ eventually, especially for the high purity source material.
Regarding film thickness: The thickness can be verified with an independent measurement, for example using a profilometer (we do not currently have a video describing profilometry). The sensor electronics have a ‘tooling factor’ that is adjusted to account for any discrepancies between the thickness displayed by the sensor and the actual measured thickness. For metal recovery: We install removable metal panels called “shields.” The shields are coated with textured aluminum film (deposited via flame spray technique by a commercial supplier). All the materials we deposit build up on the shields. The textured aluminum coating prevents the materials from flaking / peeling. Every few months we replace the shields. The old shields are sent to a commercial vendor, where the aluminum and all deposited materials are chemically removed and collected for recycling. The used shields are then cleaned and re-coated with aluminum and sent back to us for re-use
First I wanna say thank you for making these videos. I have no experience with this topic but I have always had a question & this looks like the time to learn something. Question: Why are all the internal surfaces of the vacuum chamber being coated with the deposition material, In this case gold?
Imagine if you boiled water inside a small box; the water converts to steam and then condenses on all interior surfaces of the box. When the gold evaporates, it coats all surfaces inside the chamber in a similar fashion
@@dukeuniversity-smif2466 my apologies for not proof reading before hitting send…. It was supposed to aren’t or why doesn’t the entire inner surface get coated with the evaporated material? Is it due to the lack of air inside the chamber or idk I’m curious thou.
Yes, some metals will undergo sublimation (i.e. solid to gas transition), for example chromium. Electron-beam evaporation (or “E-Beam Evaporation) is better suited to evaporate such materials (see our video on e-bam evaporation: th-cam.com/video/xIU1DDbDEDQ/w-d-xo.html ).
I really like all of your videos they were very helpful in understanding PVD processes . Thanks for making nanotechnology understandable
Best explanation on social media so far.
Brilliant explanation. Very easy to follow and understand. I have a question regarding the crystal sensor used for thickness monitoring. How and how often the deposition of metals on the crystal sensor is cleaned or removed? Is it an automatic or manual process?
Seriously wow... please make complete playlist on nanotechnology..... thank you Nd all the best..Hope every university can teach and demonstrate like you
This video is just part of a full Coursera course on nanotechnology. Check out the link that is mentioned at the beginning of this video or search for the Duke Nanotechnology course on Coursera.
@@dukeuniversity-smif2466 okay thank you
Same here, I took a trip down the rabbit hole and learned quite a bit.
Very Informative video of just few minutes and including practical demonstration too.
Good lecture,here we supply vacuum evaporation material and sources
Very interesting presentation. The elegant gestures brought attention to the subject, and were a welcome addition.
How do you calibrate the deposition thickness sensor?
How do you determine the film thickness? Is there a separate meteorology session that covers it?
I assume there may be a process to recover the gold from the chamber walls? The target showed sign of multiple deposition cycles. Even nanometers add up to $$ eventually, especially for the high purity source material.
Regarding film thickness: The thickness can be verified with an independent measurement, for example using a profilometer (we do not currently have a video describing profilometry). The sensor electronics have a ‘tooling factor’ that is adjusted to account for any discrepancies between the thickness displayed by the sensor and the actual measured thickness.
For metal recovery: We install removable metal panels called “shields.” The shields are coated with textured aluminum film (deposited via flame spray technique by a commercial supplier). All the materials we deposit build up on the shields. The textured aluminum coating prevents the materials from flaking / peeling. Every few months we replace the shields. The old shields are sent to a commercial vendor, where the aluminum and all deposited materials are chemically removed and collected for recycling. The used shields are then cleaned and re-coated with aluminum and sent back to us for re-use
Thanks Prof Dr Nan Jokerst, very informative video. It help me a lots.
Glad it was helpful!
it is super easy to understand thermal evaporation. thank you so much.
Glad it helped!
Thank you Professor and Aditi.
Amazing explanation, thank you so much ma'am,
Thank you so much ma'am 😊😊😊
Superb explanation
what a beautiful explanation
Beautifully and lucid explained 🎉
Thanks a lot 😊
Excellent 👍
Thank u, it's very easy for understanding.
Great content. Keep it up!
Why there is no coating over sample holder, it is also there
highly appreciated👍👍👍👍👍👍👍
Does the evaporated metal deposit everywhere in the chamber? Or is it targeted somehow? If so, how?
First I wanna say thank you for making these videos. I have no experience with this topic but I have always had a question & this looks like the time to learn something.
Question: Why are all the internal surfaces of the vacuum chamber being coated with the deposition material, In this case gold?
Imagine if you boiled water inside a small box; the water converts to steam and then condenses on all interior surfaces of the box. When the gold evaporates, it coats all surfaces inside the chamber in a similar fashion
@@dukeuniversity-smif2466 my apologies for not proof reading before hitting send…. It was supposed to aren’t or why doesn’t the entire inner surface get coated with the evaporated material? Is it due to the lack of air inside the chamber or idk I’m curious thou.
that is professional!
Thank you that was really useful.
You're welcome!
You mentioned phase changes, solid to liquid, liquid to gas. Is sublimation also in that list? Can low pressure regimes exclude liquid phase?
Yes, some metals will undergo sublimation (i.e. solid to gas transition), for example chromium. Electron-beam evaporation (or “E-Beam Evaporation) is better suited to evaporate such materials (see our video on e-bam evaporation: th-cam.com/video/xIU1DDbDEDQ/w-d-xo.html ).
Aditi accent is not changed 😍
Hello, what size are the nanoparticles of molten gold emitted when evaporating due to high temperature?
Taks
Tank
Thank you for lessons!
Our pleasure! Glad you liked them!