1 research outputs found
Selective Imaging of Discrete Polyoxometalate Ions on Graphene Oxide under Variable Voltage Conditions
Monosubstituted lacunary Keggin [CoSiW<sub>11</sub>O<sub>39</sub>]<sup>6–</sup> ions on graphene oxide
(GO) were used in a
comparative imaging study using aberration corrected transmission
electron microscopy at two different acceleration voltages, 80 and
200 kV. By performing a set of static and dynamical studies, together
with image simulations, we show how the use of lower voltages results
in better stability and resolution of the underlying GO support while
the use of higher voltages permits better resolution of the individual
tungsten atoms and leads to less kinetic motion of the cluster, thus
leading to a more accurate identification of cluster orientation and
better stability under dynamical imaging conditions. Applying different
voltages also influences the visibility of both GO and the lighter
Co at lower or higher voltages, respectively