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TEM images and SAED patterns of Co nanowires. Z. Ye, H. Liu, Z. Luo, H.-G. Lee, W.Wu, D.G. Naugle, and I. Lyuksyutov. Thickness dependence of the microstructures and magnetic properties of electroplated Co nanowires. Nanotechnology 20 (4), 045704 (2009) (8 pp).  [Abstract]  [PDF] 

AAO template. Y. Bisrat, Z.P. Luo, D. Davis and D. Lagoudas. Highly ordered uniform single-crystal Bi nanowires: fabrication and characterization. Nanotechnology 18 (39), 395601 (6 pp) (2007).  [Abstract]  [PDF]

SEM images of Sn nanowires. Chien-Chon Chen, Y. Bisrat, Z.P. Luo, R.E. Schaak, C.-G. Chao, and D.C. Lagoudas. Fabrication of single-crystal tin nanowires by hydraulic pressure injection. Nanotechnology 17 (2), 367-374 (2006).  [Abstract]  [PDF]






What is microscope resolution?


A microscope resolution is the shortest distance between two image points that can be distinguished using the microscope. If there are no aberrations, the theoretical resolution is defined as

λtheory = λ/β,

where l is the wavelength and b is the semiangle of collection  of the lens. A higher (or better) resolution refers to a shorter distance r.


Why do we need electron microscopy?


Electron wavelength is much shorter than others to achieve higher resolution. The wavelength of visible light is about 380 - 740 nm, and X-ray of Cu Ka, 0.154 nm. However, the electron wavelength is 0.01220 nm at 10 kV (SEM), 0.00370 nm at 100 kV (TEM), and 0.00251 nm at 200 kV (TEM).

Beside, due to the strong interactions of the high-energy electrons with the specimen, it is possible to get structural information as well as chemical composition from small areas.


Resolution Examples

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