Controlled Growth of Dendrimer-Coated Gold Nanoparticles: A Solvent-Free Process in Mild Conditions

Ulloa, J.A. ; Barberá, J. (Universidad de Zaragoza) ; Serrano, J.L. (Universidad de Zaragoza)

Resumen: Monodisperse dendrimer-coated gold nanoparticles with a spherical shape have been obtained by direct reduction of HAuCl4 with sodium borohydride in the presence of dodecanethiol as a stabilizer and subsequent functionalization by ligand exchange reaction with polybenzylic thiolated dendrons. The substitution pattern of the dendrimeric units plays a fundamental role in the rate of the functionalization exchange process and consequently conditions the size and the polydispersity of the NPs obtained. An ulterior growth process occurs by thermal stimuli (150 °C) in a solvent-free environment. This method, carried out in mild conditions, allows the formation of highly monodisperse gold NPs with different sizes for different time reactions, and we discuss the mechanisms involved in this process. Finally, we demonstrate the chemical composition and stability of our compounds by structural, thermal, and chemical characterization of the samples before and after thermal treatment.

Idioma: Inglés

DOI: 10.1021/acsomega.0c04662

Año: 2021

Publicado en: ACS OMEGA 6, 1 (2021), 348-357
ISSN: 2470-1343

Factor impacto JCR: 4.132 (2021)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 73 / 180 = 0.406 (2021) - Q2 - T2

Factor impacto CITESCORE: 5.2 - Chemical Engineering (Q2)

Factor impacto SCIMAGO: 0.708 - Chemistry (miscellaneous) (Q1) - Chemical Engineering (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/E47-20R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/PGC2018-097583-B-I00

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Química Orgánica (Dpto. Química Orgánica)