nano extra credit lab - An increasing flatness of the tubes...

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Jacob Sutker Nanotechnology November 27, 2006 Nanotechnology Extra Credit Lab The nanotube is long, thin and cylindrical but because it continues off the picture the length was measured from the length of the nanotube that is visible to me. As measured: Width : (.23 + .25 + .19 + .18 + .20)/5 = .21 microns = 210 nm Height : (.0006 + .0006 + .0007 + .0007 + .0004)/5 = .0006 microns = .6 nm Length : 8.25-0.00 = 8.25 microns = 8250 nm The height and width measurements are not the same due to a few reasons. One of which is because the curvature of the nanotube affects the cross sectional shape of the tunneling channel. The second reason is because the decay rate of tunneling probabilities inside the tunnel gap of the microscope increases curvature of the electrodes. Therefore the distance at which this picture was taken affects the measurements from the picture.
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Unformatted text preview: An increasing flatness of the tubes is predicted for decreasing tube diameter. Also increasing flatness of the tubes is predicted for an increasing distance between the tip of the microscope and the sample. From my data and the graph of the plot profile it is clear to see that this tube is single-walled. My reasoning is that the gray scale is linear in a positive direction until it peaks, where it then drops linearly as well. This proves that there are no layers. If layers were present then the grayscale line would look like a staircase due to sudden changes in grayscale when the scanning tip passed over it. Instead there is a smooth incline and decline. For example:...
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This note was uploaded on 09/23/2007 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell University (Engineering School).

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