Thermal Evaporation
ฝัง
- เผยแพร่เมื่อ 7 ธ.ค. 2019
- Nanotechnology: A Maker's Course
Thermal Evaporation Basics
Link to the full Coursera course: www.coursera.org/learn/nanote...
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The Shared Materials Instrumentation Facility (SMIF) is the Pratt School of Engineering’s core facility that enables materials, devices, and integrated systems research at Duke University in a variety of fields that include nanotechnology, biomaterials and biomedical engineering, information sciences, optoelectronics, sensor technology, and renewable energy. SMIF is housed in the Fitzpatrick Center for Interdisciplinary Engineering, Medicine and Applied Sciences (FCIEMAS). The facility consists of 7,000 square feet of clean room fabrication space, and nearly 3,000 square feet of specialized laboratory space for characterization and imaging equipment. SMIF is part of the Research Triangle Nanotechnology Network (RTNN) in partnership with similar facilities at North Carolina State University and the University of North Carolina at Chapel Hill. The RTNN is one of 16 organizations nationwide that comprise the National Science Foundation sponsored National Nanotechnology Coordinated Infrastructure (NNCI) program.
SMIF is open to all trained students, staff, faculty, and researchers and is used for both research and educational purposes. SMIF has nearly 700 users, of which 2/3 come from Duke University and 1/3 come from external academic institutions or industry. SMIF staff trains students and researchers to use the lab equipment and instruments themselves, and provides guidance and support in developing processes and methodologies that utilize these capabilities. Alternatively, SMIF staff can run samples for researchers as a service. SMIF also coordinates various educational and outreach activities. - วิทยาศาสตร์และเทคโนโลยี
I really like all of your videos they were very helpful in understanding PVD processes . Thanks for making nanotechnology understandable
Very Informative video of just few minutes and including practical demonstration too.
Amazing explanation, thank you so much ma'am,
Best explanation on social media so far.
Thanks Prof Dr Nan Jokerst, very informative video. It help me a lots.
Glad it was helpful!
Thank u, it's very easy for understanding.
Great content. Keep it up!
highly appreciated👍👍👍👍👍👍👍
it is super easy to understand thermal evaporation. thank you so much.
Glad it helped!
Good lecture,here we supply vacuum evaporation material and sources
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.
what a beautiful explanation
Excellent 👍
Thank you Professor and Aditi.
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
Thank you so much ma'am 😊😊😊
Thank you for lessons!
Our pleasure! Glad you liked them!
Superb explanation
Beautifully and lucid explained 🎉
Thanks a lot 😊
Hello, what size are the nanoparticles of molten gold emitted when evaporating due to high temperature?
Does the evaporated metal deposit everywhere in the chamber? Or is it targeted somehow? If so, how?
that is professional!
Thank you that was really useful.
You're welcome!
Why there is no coating over sample holder, it is also there
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 ).
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.
Taks
Tank
OK.... this may be a bit strange, however, having learned vacuum tube and CRT technology in high school in the 60’s, an idea just struck me. With electron beam epaxity, an electron beam is used to heat a material to be deposited on a target material. The thought hit me that the vaporized material, being charged, could be accelerated, beam formed, deflected and focused for depositing in a controlled manner. So it may be possible to construct a 3D printer capable of building solid objects at a tremendously small scale. Imagine a beam of charged atoms controlled similarly to a CRT gun that could be scanned, switched, and ‘written’ layer by layer to build the desired objects. Tell me why this would not work.....
Aditi accent is not changed 😍