Effect of incubation in simulated body fluid on dielectric and photoluminescence properties of nano-hydroxyapatite ceramic doped with strontium ions

Abstract

This paper reports the dielectric and photolumines-cence measurements of ossiointegrated strontium doped hydroxyapatite bioceramic. The study on in-vitro bioactivity of Sr-HAp is carried out by using modified simulated body fluid. Dielectric properties of these ossiointegrated samples are studied in the frequency range 10 Hz to 1 MHz at room tempera-ture. Dielectric constant is found to be decreasing with an increase in incubation period and frequency of applied ac field. Higher the period of incubation and applied ac frequency, higher is the dielectric loss. AC conductivity shows frequency independent behav-iour for all samples in lower frequency region and then increases linearly with increase in frequency. Sample incubated for longer duration shows higher conductivity. The optical properties of incubated Sr-HAp samples are also investigated with photolu-minescence (PL) technique. The PL study shows the blue emission at around 476 nm when excited at 409 nm. The PL intensity increases with increase in incu-bation duration and Sr-substitution.