William Angerer - Department of Physics and Astronomy - University ...

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nanorope
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Figure 7.8: Carbon nanotube sample mask.
used photolithography to etch several 25 J.1.m squares on a chromium film deposited
on glass. The squares were positioned in an asymmetric pattern to facilitate identification
of a single square. After depositing the carbon nanoropes on the mask. we
examined the mask with a Zeiss Axiophot microscope using an air coupled 0.60 ~:\
differential interference contrast (DIC) objective. Typically we deposited the dilute
carbon nanorope solution on 15 etched squares.
On average, one or two carbon
nanoropes were visible on the squares. Fig. 7.8 displays a diagram of the masks with
deposited nanoropes. After identifying potential candidates using DIC optical microscopy,
the samples were examined by AFM. AFM determined if any non-optically
visible nanoropes or carbonaceous material were close to, i.e. within,..,,5 /-lm, our
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