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Z-Constrast
with High Angle Annular Dark-Field STEM |
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Scanning transmission electron
microscopy (STEM) images of a Zn-containing polymer, acquired
on the JEOL 2010F STEM. The images show numerous Zn-rich domains
approximately 2.5 nm in diameter. These aggregates enhance
the physical properties of the material.
The image in (a) was acquired in bright field STEM, in which the electron density
difference between Zn-rich domains and the matrix polymer serves as the contrast
mechanism. The aggregates appear dark, without the need for chemical staining
which may alter the size of the features.
The image in (b) was acquired in high-angle annular dark field STEM, in which
the high atomic number of the Zn-rich domains serves as the contrast mechanism.
The aggregates appear bright, confirming that they contain high-atomic-number
Zn atoms. Complete correspondence of the features in (a) and (b) is indicated
by the circles.
Laurer, J.H.; Winey, K.I. Macromolecules 31(25), 9106-9108, 1998. |
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