Under the Microscope: Nanowires (Lecture 16 of 17) Cambridge University

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Cambridge University's Under the Microscope is a collection of videos that show glimpses of the natural and man-made world in stunning close-up. Check out the rest of the series here: http://bit.ly/A6bwCE

Nanowires growing in real time. Each nanowire is roughly 450 atoms wide.

Andrew Gamalski:

"This video is a bright field environmental transmission electron microscopy video of silicon nanowires growing from gold catalyst particles. The dark crystalline shapes initially present in the video are the gold particles. Disilane, a silicon rich gas, feeds nanowire growth. The solid catalyst particles liquefy after being exposed to the disilane early in the video. Eventually, a solid silicon crystal forms in the now liquid catalyst particle. This crystal continues to grow as silicon is continuously deposited into the catalyst from the disilane gas. The new silicon crystal's diameter is restricted by the size of the gold catalyst. This means the silicon can grow in one direction only, forming a nanowire."

Video courtesy of S. Hofmann, et al. Nature Materials 7, 372 - 375 (2008). Speaker in the video is Andrew D. Gamalski, a current graduate student studying nanowire growth under Dr. Stephan Hofmann in the Engineering Department at the University of Cambridge. Additional information about this group's experiments involving germanium nanowires can be found at: http://nanotechweb.org/cws/article/tech/43377

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