Exploring the synthesis conditions to control the morphology of gold-iron oxide heterostructures
作者机构：Laboratory of Amorphous SolidsINTECINFaculty of EngineeringUniversity of Buenos Aires - CONICETBuenos AiresCP C1063ACVArgentina Department of Inorganic ChemistryInstitute of ChemistryUniversity of Campinas (UNICAMP)CP615413083-970CampinasSPBrazil Brazilian Nanotechnology National Laboratory (LNNano)Rua Giuseppe Maximo Scolfaro 10000CampinasSPBrazil International Iberian Nanotechnology Laboratory (INL)Av. Mestre Jose Veiga s/n4715-330 BragaPortugal “Gleb Wataghin” Institute of PhysicsUniversity of Campinas (UNICAMP)CEP 13083-859CampinasSPBrazil Autonomous University of ManizalesAntigua Estacion del FerrocarrilManizalesCP 170001Colombia Facultad Regional Santa CruzUniversidad Tecnoldgica Nacional - CIT Santa Cruz (CONICET)- Av delos Inmigrantes 555Rio GallegosSanta CruzArgentina Materials Science and Engineering ProgramThe University of Texas at AustinAustinTexas 78712USA
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2019年第12卷第8期
页 面：1781-1788页
核心收录：
基 金：the Brazilian agencies Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) the Argentinian agency Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) (fellowship and project PIP 468CO) Coordenacao de aperfeicoamento de pessoal de nivel superior (CAPES) 巴西圣保罗研究资助基金会(FAPESP)资助 巴西国家科学技术委员会(CNPq)资助
主 题：nanoparticles gold-iron oxide heterostructures heterogeneous nucleation epitaxial growth HR-microscopy
摘 要：Gold-iron oxide nano-heterostructures with a clear and well-defined morphology were prepared via a seed-assisted method. The synthesis process and the events of heterogeneous nucleation during the decomposition of the iron precursor were carefully studied in order to understand the mechanism of the reaction and to tailor the architecture of the fabricated heterostructures. When employing Au seeds of 3 and 5 nm, nanoparticles with a dimer-like morphology were produced due to the occurrence of a single iron oxide nucleation event. Otherwise, multi-nucleation events could be favored by two mechanisms:(i) by the incorporation of a reducing agent and the slowing down of the heating protocol, leading to a core-shell system;(ii) by the increase of the Au seed size to 8 nm, leading to a flower-like system. Further increase of the Au seed size to 12 nm using similar synthesis conditions promotes the homogeneous nucleation and growth of the iron oxide phase, without formation of heterostructures. An in-depth study was performed on the gold-iron oxide heterostructures to confirm the epitaxial growth of the oxide domain over the Au seed and to analyze the elemental distribution of the components within the heterostructures. Finally, it was found that the modification of the plasmonic properties of the Au nanoparticles are strongly influenced by the architecture of the heterostructure, with a more pronounced damping effect for the systems produced after multi-nucleation events.
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