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Waterloo Advanced Technology
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What's NeXT
21 Nov 2018 - Quanta FEG off line - Unfortunately, the new source installed a couple of weeks ago did not last long. SFR has requested a new source to be shipped immediately and will install it as soon as possible, likely by mid next week. We thank our users for their understanding and patience.
14 Nov 2018 - LEO FEG down - The electron source in the LEO SEM has been experiencing a lot of problems lately. LEO users should contact Nina for alternate SEM services. Both the Ultra and Quanta are working OK.
8 Nov 2018 - Quanta FEG service is complete - Resuming normal operation - This service has replaced the 3 years old FE source and a high voltage cable-connector assembly. We will need to find some cash to eventually replace the five Pt apertures (which will become dirty with use). The images are excellent now. Happy data mining.
This service has created a big dent in our budget ($60k). Depending on the current usage of the Quanta, we could conserve filament life (and reduce operating cost) by running the tool every other week (except for emergency situation). We will start this operating mode after Christmas. We ask the user to please plan a little bit ahead and watch the booking calendar.
1 Nov 2018 - Quanta FEG service in progress - The service engineer is on site this week and has started working on replacing the FE source. More update later.
18 Oct 2018 - Quanta FEG down for source replacement - After running for over 3 years, the FE filament in the Quanta has died. All quanta users should contact Nina or Lei for alternative solution. We are in the process of getting service to see if we could replace this quickly.
How to become a certified SEM user? Please follow the FAQ link above or here for more details. Please contact Nina to arrange for SEM training and certification.
Why we don't need a lot of sample for SEM analysis? To our users with powder samples, we wish to remind them that one does not really need tons of samples to do SEM. Powders should be uniformly spread over a 1 mm x 1 mm area (in a layer a few microns thick) and attached securely onto the carbon tape. We definitely do not need powders spreading over an area larger than 1 mm x 1 mm and/or in a layer thicker than 10 microns. Here, we should remember: LESS is MORE, b/c: (a) A finely focussed electron beam (<10 nm dia.) hitting any sample (especially the "gassy" ones) at high energy will cause local heating/interaction that leads to rapid gas desorption, which will cause the filament (sitting at the EHT voltage) to arc (the filament will not survive above 5x10-9 mB). Field-emission filament will not be able to handle a lot of arcings like that, which will shorten its lifetime significantly. So, the less samples that one uses, the more stable is the machine. (b) Powder samples that are too thick (or not securely attached to the carbon tape) will also lead to partial charging. This is b/c the electron beam typically penetrates a few microns, creating secondary electrons that are finding their way to the carbon tape. If the sample is too thick, these secondary electrons stay inside the bulk and the sample will charge up, leading to bad images. (c) More samples in the chamber will lead to a poorer vacuum, and it will take a longer time to pump the system down to the acceptable operating vacuum condition. Less gas in the chamber and less gas desorption from the sample (as induced by the high-energy electron impact) will also improve image quality.
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TOOLSET & SERVICE
We offer pay-per-use service for both academic and industrial users at competitive rates, with our expert operators providing sample characterization measurement (and analysis). For a selected number of tools (e.g. SEM), we also provide training to allow the users to access the tools through a self-serve booking system. To submit samples for analysis, please fill in Form A (and Form B for University of Waterloo users) above, and contact the respective technical specialists. For all other enquiries and guided lab tours, please contact manager . |
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KNOWLEDGE BASE Inside look at LEO chamber | CORE RESEARCH aT WATLAB Research news to come... |
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6 Dec 2018
Established
with funding support from Canada Foundation for Innovation and the
Province of Ontario in 1999, WATLab is the first multidisciplinary
materials research centre in Canada's Technology Triangle. WATLab
offers a complete toolset for advanced materials research and
emerging technology development. Most of our instrument systems are
state-of-the-art and some are unique in Canada, and they include:
OUTREACH