OLIVEIRA, MAYARA L.P. deWANDERLEY NETO, ESTACIO T.QUEIROZ, ALFREDO A.A.E. deQUEIROZ, ALVARO A.A. de2021-12-072021-12-072021OLIVEIRA, MAYARA L.P. de; WANDERLEY NETO, ESTACIO T.; QUEIROZ, ALFREDO A.A.E. de; QUEIROZ, ALVARO A.A. de. Intelligent optical temperature sensor based on polyglycerol dendrimer microspheres encapsulating hopeites. <b>Materials Research</b>, v. 24, n. 4, p. 1-8, 2021. DOI: <a href="https://dx.doi.org/10.1590/1980-5373-MR-2020-0568">10.1590/1980-5373-MR-2020-0568</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/32361.1516-1439http://repositorio.ipen.br/handle/123456789/32361Optical thermometry is a growing technological field which exploits the ability of certain materials to change their optical properties with temperature. In this work, poly(glycerol dendrimer) microspheres (PGLyD) encapsulating cobalt-doped hopeite (CoHo) was synthesized for its potential use as optical thermometer. The structure of the CoHo:PGLyD was studied using scanning electron microscopy (SEM), infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). On the basis of SEM images, the CoHo:PGLyD exhibited a spherical shape in which around 80% of the microspheres were within 0.82 µm. A multilayer feed-forward artificial neural network (MLP-ANN) was used to extract the chromaticity profile dependence of the CoHo:PGLyD with temperature. A color change was observed for the CoHo:PGLyD, going from dark blue (490-550 nm) to pale pink (650 nm) when the temperature changed from 20-200 °C, respectively. These results suggest that CoHo:PGLyD is a promising material for temperature sensing applications.1-8openAccessoptical activitytemperature measurementsensorscobaltzinc phosphatesArtigo de periódico42410.1590/1980-5373-MR-2020-056816.0946.50