Abstract
Piezoelectric ultrathin composite film comprised of poly(sodium 4-styrenesolfonate)(PSS) and poly(diallyldimethylammonium chloride)(PDDA) was synthesized using the electrostatic self-assembly (ESA) process. The ESA processed PSS/PDDA film is a layer-by-layer laminated structure, which exhibits piezoelectric response directly, with a piezoelectric coefficient d 33 = 6.0 pC/N and without poling treatment. It is assumed that the self-assembly process may play a role in molecular alignment resulting in net polarization in the layer-by-layer structured ultrathin film, a process quite different from that used to form conventional piezoelectric films.
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