GammaPC - Nanotechnology


How to Make Top-Down Silicon Nanowires



This is a set of three youtube videos, between two and eight minutes long, each, that helps describe the process of making Silicon nanowires using a "top-down" method. There are many ways to make nanowires, depending on the materials used, the substrate, the technique, the temperature and many other factors, including the presence of electric current, light, heat, cold, oxygen, nitroge, heavy metals and much more. The field of nanotechnology is wide open.





Images of Silicon Nanowires using Electron Microscopes




These scanning electron microscope (SEM) images are of Silicon nanowires, which were made with a solution of silver nitrate and hydrofluoric acid (AgNO3/HF solution). The thickness of these nanowires is 50 - 70 nanometers. Their height is approximately 4 microns.






Zooming out... This wafer was (100) aligned p-type Silicon with Boron surface doping, etched in still solution.






Zooming out further.






A different wafer, also (100) p-type Si, but etched in an ultrasonic cleaner.






As we zoom in on this shot, notice the clumping together of the nanowires.






These images were taken on an Hitachi S3500 Scanning Electron Microscope (SEM). This is the limit of the resolution.






A top view of the same wafer at low
magnification.






Here again we zoom in to see a little more detail.






And then zoom a little bit more.






And then finally we exceed the resolution of the SEM.



















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Home: A place where you can sit back, relax and pretend that the rest of the world doesn't exist.

Videos: Here you can find videos of some of my adventures in sailing, racoons, gate-building and more.

Nanotechnology: We are beginning explorers in this fantastic new world of the extremely small - the nanoscale.

Gammascopes: We are looking at the use of an amazing material, aluminized Mylar, to make telescope mirrors.

Gammabooks: GammaPC was originally Gamma Publishing Company, which sold books. I still sell books. I'm also putting some of my books online, here, and you can read them free (with advertisements) or download them (commercial-free) to your reading device. Thank you for your readership. Soon, I hope to make them available in paperback/hardcover. Some copies of the TE Theory in hardcover are still available. These are extremely rare books (a single printing), which at one time, sold for upwards of $3,000. I used very high-quality acid-free paper to print them, so they're in mint condition (and new - never opened).

Spray Cooling: This is a subject of considerable research and we presently hold the world record for the highest heat flux through any electron device, an IGBT, at 825 W/cm2.

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