Structure and Optical Properties of Borophosphate Glasses

Reference	Presenter	Authors (Institution)	Abstract
10-080	Thais Mota Carvalho	Carvalho, T.M.(Universidade Federal Fluminense); Ferreira, E.A.(Universidade Federal Fluminense); de Souza, M.L.(Universidade Federal Fluminense); da Silva, L.(Universidade Federal Fluminense); Paralovo, J.(Universidade Federal Fluminense); da Silva, C.F.(Universidade Federal Fluminense); Ribeiro, G.C.(Universidade Federal Fluminense);	Considered one of the oldest materials in history, it is estimated that glass was first synthesized, around 7,000 BC by the Phoenicians, and still today, it is of great scientific and technological interest. Borophosphate glasses represent an important class of these materials due to their optical properties, their low cost, and low melting temperature. Such categories of glass can become active for the nucleation of metal nanoparticles (NPs) on their surface when subjected to doping with metals. Depending on the shape, size, and dielectric constant of the medium, the nanostructures of noble metals present colorations and particular optical properties, exhibiting the localized surface plasmon resonance phenomenon. This work aims to evaluate the composition of the glass in the system xNaH2PO4 - yH3BO3 – zAl2O3 – wAgNO3 (x/y= 1, 2 and 3; z= 13% and 7,5 in weight and w= 3% and 1,5% in weight), varying the proportions of the reagents, to verify their influence on the optical properties of the material, and thus to obtain a promising composition for nucleation of silver NPs. The samples were prepared by the melting and cooling method and characterized by measuring their reflectance, transmittance, and refractive index, using ellipsometry. Raman spectroscopy was also used to characterize the samples.
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