Structure and Luminescence Properties of Nanofluorapatite Activated with Eu~(3+) Ions Synthesized by Hydrothermal Method

摘要

Nanotechnology is the most intensively developing a multidisciplinary field of research combining various disciplines of science achievement. Nanomaterials show unexpected and interesting chemical and physical properties different from those of the original in the micro-sized scale. A success of nanotechnology in field of physical, chemical, and medical sciences, it has now started revolutionizing the regenerative medicine as well as theranostic. The apatites are inorganic compounds with a general formula M_(10)(XO_4)6Y_2, where M represents divalent cations (e.g. Ca~(2+), Sr~(2+), etc.), XO4= PO4~3-, VO4~(3-), etc., and Y represents anions: F~-, OH~-, Cl~-, Br-, etc., respectively. Calcium hydroxyapatite (HAP) is a material commonly used in bone tissue engineering because of its similarity to natural bone (Nabiyouni M, Zhou H, Luchini TJF, Bhaduri SB Mater Sci Eng C 37: 2014; Wiglusz RJ, Pozniak B, Zawisza K, Pazik R RSC Adv 5, 2015). Fluorapatite (FAP) could be an alternative biomaterial owing to its low solubility in comparison to HA, and good biocompatibility among this group. Furthermore, human tooth enamel contains some fluoride ions in the form of fluorapatite or fluor-hydroxyapatite that improve mechanical properties of teeth (Sun Y, Yang H, Tao D Ceram Int 38: 2012). The nanofluorapatite with europium(III) impurity were obtained by microwave stimulated hydrotehermal technique and then, annealed in temperature range 500-1000 °C. The structure and morphology of the synthetic materials have been studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), IR and Raman spectroscopy. The average grain size was estimated using theoretical calculations (Rietveld method) as well as experimental techniques like TEM. The photoluminescent properties of nanopowders were investigated by excitation, emission spectroscopy and emission lifetimes (Figs. 73.1 and 73.2).