ENGRI111_25_STM

ENGRI111_25_STM - Scanning tunneling microscopy(1980’s...

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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
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Unformatted text preview: Scanning tunneling microscopy (1980’s) •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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ENGRI111_25_STM - Scanning tunneling microscopy(1980’s...

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