Seeded-Growth Aqueous Synthesis of Colloidal-Stable Citrate-Stabilized Au/CeO2 Hybrid Nanocrystals: Heterodimers, Core@Shell, and Clover- and Star-Like Structures

Autor: Jordi Piella, Jordi Arbiol, Javier Patarroyo, Víctor F. Puntes, Neus G. Bastús, Ana Gónzalez-Febles
Přispěvatelé: Agencia Estatal de Investigación (España), Universidad Autónoma de Barcelona, Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Patarroyo, Javier, Arbiol, Jordi, Bastús, Neus G., Puntes, Víctor F., Patarroyo, Javier [0000-0002-3703-666X], Arbiol, Jordi [0000-0002-0695-1726], Bastús, Neus G. [0000-0002-3144-7986], Puntes, Víctor F. [0000-0001-8996-9499]
Rok vydání: 2019
Předmět:
Zdroj: Recercat. Dipósit de la Recerca de Catalunya
instname
Recercat: Dipósit de la Recerca de Catalunya
Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Digital.CSIC. Repositorio Institucional del CSIC
Dipòsit Digital de Documents de la UAB
Universitat Autònoma de Barcelona
ISSN: 1520-5002
0897-4756
Popis: Well-defined colloidal-stable citrate-stabilized Au/CeO2 hybrid nanocrystals (NCs) with coherent quasi-epitaxial interfaces and unprecedented control of their architectural and morphological characteristics have been synthesized via a novel and straightforward seeded-growth aqueous approach. The synthetic strategy, based on the identification of the experimental conditions under which the heterogeneous nucleation and growth processes of CeO2 onto presynthesized Au are controlled, allows for the fine adjustment of each individual domain in the structure, particularly the size of the Au core (from 5 to 100 nm), the thickness of the CeO2 shell (from 5 to 20 nm), and the growth mode of CeO2 onto Au NCs (from core@shell to heterodimer, clover- and star-like structures). This morphological control is achieved by the rational use of sodium citrate, which plays multiple key roles, as a reducer and stabilizing agent in the preparation of Au NCs, and as a complexing agent of Ce3+ for its controlled oxidation and hydrolysis during the subsequent CeO2 deposition. The resultant Au/CeO2 NCs remain stable and well-dispersed in water, allowing us to study the impact of fine variations of the NC structure on the underlying optical response. This level of morphological control, as well as the ease by which such well-defined nanostructures are produced, opens new opportunities for systematically investigating the interactions between individual components in designing more advanced complex NCs. Remarkably, because no organic solvents are used and no toxic waste is formed during the reaction, the proposed synthesis method can be defined as sustainable, viable, and cost-effective.
We acknowledge financial support from the Spanish MINECO (MAT2015-70725-R, ENE2017-85087-C3), MICINN (RTI2018-099965-B-I00), and from the Catalan Agencia de Gestió d’Ajuts Universitaris i de Recerca (AGAUR) (2017-SGR-1431, 2017-SGR-327). Financial support from the HISENTS (685817) Project financed by the European Community under H20202 Capacities Programme is gratefully acknowledged. N.G.B. acknowledges financial support by MINECO through the Ramon y Cajal program (RYC-2012-10991). ICN2 is supported by the Severo Ochoa program from Spanish MINECO (grant no. SEV-2017-0706) and is funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed in the framework of the Universitat Autonoma de Barcelona Degree and Ph.D. program.
Databáze: OpenAIRE
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