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Genesis of gold nanoparticles: nucleation, growth and stabilization

Grant number: 14/27127-3
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2015
Effective date (End): February 28, 2019
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal researcher:Sandra Helena Pulcinelli
Grantee:Ana Flávia Suzana
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Associated scholarship(s):17/01283-7 - Bragg coherent diffraction imaging for characterisation of gold nano-catalysts, BE.EP.DR

Abstract

Obtaining metallic nanoparticles has become an area of growing interest of the scientific community in recent years. Solutions of colloidal gold particles are very interesting systems because of the easiness in the preparation route and the possibility of functionalization of the surface of the nanoparticles with various biological molecules which ensures some applications that are related, for example, with curing diseases. Although gold has been used for thousands of years to cure certain diseases, only in the last two decades is that the study of their properties has intensified so that the growth in the number of publications increases exponentially every year. One reason for this expansion is the development of the various spectroscopic techniques that allow us to study the nanoscale structure, shape and chemical environment of the nanoparticles. The synchrotron light, in particular, has been widely used for this type of study because of its unique features as high brightness, collimation, possibility to choose the incident energy (wavelength), etc. The gold nanoparticles are the most stable among the metal nanoparticles and they have fascinating features such as the optical properties (quantum effect). The results derived from these characteristics are its applications in various fields such as catalysis and biology. As a consequence, this research topic promises to be a promising field of study due to the multifunctional character of this material. However, in order that nanoparticles have a very definite applicability in nanotechnology it is necessary to establish a route of synthesis with very well controlled parameters; this has a direct influence on the shape, size, dispersion and stability of the nanoparticles. The idea of this study is to monitor the early stages of nucleation, to investigate the role of the medium used for the synthesis, as well as the pH, the influence of the concentration of gold and also the temperature. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PASSOS, ALINE R.; ROCHET, AMELIE; MANENTE, LUIZA M.; SUZANA, ANA F.; HARDER, ROSS; CHA, WONSUK; MENEAU, FLORIAN. Three-dimensional strain dynamics govern the hysteresis in heterogeneous catalysis. NATURE COMMUNICATIONS, v. 11, n. 1 SEP 18 2020. Web of Science Citations: 5.
ROCHET, AMELIE; SUZANA, ANA FLAVIA; PASSOS, ALINE R.; KALILE, TIAGO; BERENGUER, FELISA; SANTILLI, CELSO V.; PULCINELLI, SANDRA H.; MENEAU, FLORIAN. In situ reactor to image catalysts at work in three-dimensions by Bragg coherent X-ray diffraction. CATALYSIS TODAY, v. 336, n. SI, p. 169-173, OCT 1 2019. Web of Science Citations: 1.
SUZANA, ANA FLAVIA; ROCHET, AMELIE; PASSOS, ALINE RIBEIRO; CASTRO ZERBA, JOAO PAULO; POLO, CARLA CRISTINA; SANTILLI, CELSO VALENTIM; PULCINELLI, SANDRA HELENA; BERENGUER, FELISA; HARDER, ROSS; MAXEY, EVAN; MENEAU, FLORIAN. In situ three-dimensional imaging of strain in gold nanocrystals during catalytic oxidation. NANOSCALE ADVANCES, v. 1, n. 8, p. 3009-3014, AUG 1 2019. Web of Science Citations: 0.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SUZANA, Ana Flávia. In situ imaging of gold nanocrystals during the CO oxidation reaction studied by Bragg Coherent Diffraction Imaging. 2019. 149 f. Doctoral Thesis - Universidade Estadual Paulista "Júlio de Mesquita Filho" Instituto de Química..

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