Síntese de nanotriângulos de ouro para aplicação em biossensores plasmônicos

Abstract

Gold nanoparticles (AuNPs) are widely used in plasmonic biosensors due mainly to the occurrence of the localized surface plasmon resonance (LSPR) effect. AuNPs can be obtained in different formats, such as spheres, rods and triangles. Gold nanotriangles (AuNTs) are interesting because they exhibit an excitation of plasmon in the plane, which is not observed in spherical AuNPs and can give a greater sensitivity when used in biosensors that exploit the LSPR effect. In this sense, the objective of this work was the production of AuNTs using two different methods: a) seed-mediated growth and b) Turkevich with temperature control, both aiming to obtain less polydisperse material. Materials obtained according to the Turkevich method did not indicate the presence of AuNTs. While for the tests performed with the seed-mediated growth method, a small population of AuNTs was produced. The obtained materials were characterized by UV-Vis spectrophotometry, Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM) images. As future prospects, it is aimed to increase the yield of the nanoparticulate material and to use it to obtain plasmonic substrates.