Desenvolvimento de sistemas fotônicos a partir de matrizes silicoaluminosas dopadas com neodímio com perspectivas de uso em odontologia.

Abstract

The synthesis of silicoaluminates glasses doped with rare earth oxides is currently one of the main challenges for the development of optical devices such as high-intensity used in lasers dentistry. In this work, monoliths glasses silicoaluminates doped with neodymium were synthesized by route sol-gel. Were used as precursors for the formation of oxide glasses, TEOS as a source of silica, and forming glass, aluminum acetate as a source of aluminum, and glass structural network of neodymium oxide and neodymium chloride as dopant with luminescent properties. The molar ratio of alcoóxides was 2:0,5 and 2:0,2 respectively. The hydrolysis reactions occurred at 60o C under constant agitation, the process occurred by acid catalysis. After the formation of the gel and subsequent drying that occurred at room temperature in airtight containers, glass obtained were heat-treated to 200oC for two hours. The glasses were characterized by infrared spectrometry (IR), X-Ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet visible spectroscopy (UV-Vis) and Differential Scanning Calorimetry (DSC). The structural characterization by XRD shows an intense band with a peak central 23,5o (2 ), demonstrating the amorphous nature of the material. Morphological characterization was performed by scanning electron microscopy (SEM), showing an amorphous glass and homogeneous, confirming the acid catalysis in the formation of gel particles. The spectra of infrared (IR) showed characteristic peaks of impurities and residual organic hydroxyl who remained in the glass matrix. Monoliths of high purity and homogeneity were obtained, characterized by uniformity in the composition.