Lead-free (Na_(0.5),K_(0.5))NbO_3 thin films for the implantable piezoelectric medical sensor applications

摘要

The chemical solution-derived lead-free piezoelectric (Na_(0.5),K_(0.5))NbO_3 (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 10 Hz and the average hydrostatic piezoelectric d_h value in an n-dodecan liquid solution was 19.1 pC/N at a pulse pressure of 0.025 MPa. These results prove that the lead-free NKN film is an attractive candidate for the implantable medical sensor applications.