Journal
APPLIED PHYSICS LETTERS
Volume 87, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2043247
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An electron beam can drill nanopores in SiO2 or silicon nitride membranes and shrink a pore to a smaller diameter. Such nanopores are promising for single molecule detection. The pore formation in a 40 nm thick silicon nitride/SiO2 bilayer using an electron beam with a diameter of 8 nm (full width of half height) was investigated by electron energy loss spectroscopy with silicon nitride facing toward and away from the source. The O loss shows almost linear-independent of which layer faces the source, while N loss is quite complicated. After the formation of a pore, the membrane presents a wedge shape over a 70 nm radius around the nanopore. (c) 2005 American Institute of Physics.
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