Abstract
The chemical solution-derived lead-free piezoelectric (Na0.5,K0.5)NbO3 (NKN) thin film was successfully prepared for an implantable cardio-mechanical electric sensor (CMES) in pacemakers. The NKN film on the tubular Pt for CMES showed a dense and uniform microstructure with a smooth surface. The maximum dielectric constant of the NKN film was 2000 at a low frequency of 10Hz and the average hydrostatic piezoelectric dh value in an n-dodecan liquid solution was 19.1pC/N at a pulse pressure of 0.025MPa. These results prove that the lead-free NKN film is an attractive candidate for the implantable medical sensor applications.
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