NanoscaleImagingS117-robinson

NanoscaleImagingS117-robinson - 10/18/2011 S117: Nanoscale...

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10/18/2011 1 S117: Nanoscale Imaging (1 100 nm) Dr. Jill Robinson How will you determine the size of these particles? Key Idea about Nanoscale: Characteristic properties of matter do change with size, especially in the nano and atomic size scales. Spectroscopic measurements 400 450 500 550 600 NormalizedAbsorbance Wavelength (nm) 175 s 135 s 105 s 75s 50 s 40 s 30 s 20 s 10 s
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10/18/2011 2 Can we directly “see” these particles? What is the smallest object that you have “seen”? How small was this object? How did you view it? Can this same technology be applied to the quantum dots? Theoretical limit of an optical microscope 1873: Abbe diffraction limit ) sin ( 2 n d nsin θ = numerical aperture (range of angles over which light can be accepted by a system) = 1.4 Meaning:
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10/18/2011 3 Size Scales and Imaging Instrumentation Electron Microscopy: SEM –Scanning Electron Microscopy (emitted electrons for surface topography) TEM Transmission Electron Microscopy (pass electrons through sample for image) Scanning Probe Microscopy (uses a sharp tip to create image of the surface) STM –Scanning Tunneling Microscopy (tunneling current) AFM Atomic Force Microscopy (force) History of Imaging Instruments 1674: Optical Micrscope (Aton Van Leeuwenghek) Electron Microscopy 1930’s: TEM Ernst Ruska and Max Knoll (Nobel Prize in 1986) 1950’s: SEM Scanning Probe Microscopy 1982: STM (Binning and Rohrer) (1986 Nobel Prize) 1986: AFM (Binning, Gerber and Quate)
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This note was uploaded on 01/17/2012 for the course S 117 taught by Professor Stephenjacobson during the Fall '11 term at Indiana.

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NanoscaleImagingS117-robinson - 10/18/2011 S117: Nanoscale...

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