Polymer brushes of PMMA grown from a silicon surface using surface
initiated ATRP are explored here as "electrets" to store electrostatic
charges. The polymer brushes are "charged" using an AFM tip electrode or
a gold coated PDMS stamp electrode. These charged patterns that are
created by this technique are able to imobilize charged gold
nanoparticles and are stable even in good solvents. The charge stability
is examined in various solvents and in various temperatures. They cite
that the charges deteriorate mostly by adsorption of counter ions over
time, especially because the humidity was 60% while they were working.
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