Banca de QUALIFICAÇÃO: RAPHAEL DE MEDEIROS SOUTO MAIOR BALTAR
Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.STUDENT : RAPHAEL DE MEDEIROS SOUTO MAIOR BALTAR
DATE: 05/09/2022
LOCAL: Sessão por Videoconferência (fechada ao público).
TITLE:
EVALUATION AND DEVELOPMENT OF A CALORIMETRIC SENSING SYSTEM BASED ON METALLIC NANOPLATFORMS.
KEY WORDS:
Colorimetry; Nanoparticles, Optical Sensor.
PAGES: 69
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:
In this work, the use of gold and silver nanoshells will be evaluated and as a starting point for the establishment of colorimetric sensor platforms. It is intended to develop a colorimetric sensing system based on metallic nanostructures that includes a transducer platform and a reading module. Mie's theory will be explored in the analysis of the spectral response of nanoparticles. The linearity of the sensor and the sensitivity to the influence of the nanoshell configuration, color space, light source and range of interest for the surrounding medium reference index will be evaluated. A selection procedure for highperformance colorimetric sensor platforms will also be defined. In addition, a self-referenced colorimeter based on chromatic adaptation methods will be developed. High performance plasmonic nanoplatforms will be identified and evaluated by computational model and experimentally. Preliminary results identified that platforms made of nanoshells with a SiO2 core with 35 nm radius and a shell thickness of 25 nm Ag, presented sensitivity values up to 2.78 𝑅𝐼𝑈 −1 , considering the Hue parameter of the HSV color space. NS with 50 nm SiO2 core and 5 nm thick gold shell presented the best overall result, with sensitivity ηb = 450 nm/RIU and FoM = 7.9 𝑅𝐼𝑈 −1 . The identification of optimized plasmonic nanoplatforms can extend the use of colorimetric applications.
BANKING MEMBERS:
Presidente - 2199776 - RENATO EVANGELISTA DE ARAUJO
Interno - 2226204 - JOAQUIM FERREIRA MARTINS FILHO
Externo à Instituição - JOSÉ JOATAN RODRIGUES JÚNIOR - UFS