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Field Emission of Carbon Nanotubes - Screening Effect and Electric field enhancement
Posted 5 gen 2017, 11:59 GMT-5 0 Replies
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I am an absolute newbie in COMSOL. I have trying to model the field enhancement of Carbon Nanotubes (CNT) in a field emission process. The outcomes that I was anticipated is similar to these:
www.comsol.com/paper/optimization-of-carbon-nanotube-field-emission-arrays-6288
nanoscalereslett.springeropen.com/articles/10.1186/1556-276X-8-319
I started with a simple model consist of substrate-CNT cathode-anode as shown in the attached picture. I used Electrostatic study to compute the electric field distribution of the model. I have input potential of -100V at the substrate and grounded the anode. However, the outcome that I have obtained deviates from the anticipation. No field enhancement at the CNT tip and the electrical field is the same along the the CNT. At the same time, I have attempted to build a few more CNT around the initial CNT (as shown in the url link). The electrical field at the CNT tip(s) is identical despite single CNT/multiple CNT stays closely together.
Did I miss any steps in performing the simulation? You help is really appreciated. Thank you!
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Hello Yu Dian Lim
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