ENGRI111_25_STM - Not a microscope in conventional sense...

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Nanoscale Characterization Microscopy • Form a magnified image of an object • Light waves • Resolution: limited by wavelength of light 200 nm: smallest feature resolvable by visible light microscope “Microscopes” for nanotechnology Scanning electron microscope: average 5 nm, best 1 nm Transmission electron microscope: 0.1 to 0.2 nm Scanning probe microscope: 0.01 to 5 nm
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E. Ruska Electron microscopy (1930’s) •Use wave-nature of electrons for imaging •Wavelength of electron is 0.2 nm: resolve objects not visible with optical microscopy G.Binnig, H. Rohrer Scanning tunneling microscopy (1980’s)
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Unformatted text preview: Not a microscope in conventional sense Senses atoms at a surface with a needle-like probe Digital image of atomic-scale surface topography 1986 Nobel Prize in Physics to Ruska, Binnig, and Rohrer Without these two inventions, nanotechnology could not have started Why the Nobel so soon for Binnig and Rohrer? STM: Atomic Resolution Model of Si surface 2.7 nm Imaged in STM at Cornell Tungsten tip +2 V on sample, 1 nA QuickTime and a TIF (Group 4 Fax) decompres or are ne ded to se this picture....
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This note was uploaded on 04/09/2009 for the course MSE 111 taught by Professor Giannelis during the Fall '07 term at Cornell University (Engineering School).

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ENGRI111_25_STM - Not a microscope in conventional sense...

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