Ligand effects in the stabilization of gold nanoparticles anchored on the surface of graphene: Implications in catalysis
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Other documents of the author: Ventura Espinosa, David; Martín Solans, Santiago; García, Hermenegildo; Mata Martínez, Jose A
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comunitat-uji-handle3:10234/160293
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Title
Ligand effects in the stabilization of gold nanoparticles anchored on the surface of graphene: Implications in catalysisAuthor (s)
Date
2021-01-02Publisher
Elsevier; Academic PressBibliographic citation
VENTURA-ESPINOSA, David, et al. Ligand effects in the stabilization of Gold nanoparticles anchored on the surface of graphene: Implications in catalysis. Journal of Catalysis.Type
info:eu-repo/semantics/articlePublisher version
https://www.sciencedirect.com/science/article/pii/S0021951720305194#!Version
info:eu-repo/semantics/acceptedVersionSubject
Abstract
Gold nanoparticles (Au NPs) functionalized with N-heterocyclic carbene (NHC) ligands immobilized ontographene are obtained via spontaneous decomposition of well-defined gold-NHC complexes by reducedgraphene oxide (rGO) ... [+]
Gold nanoparticles (Au NPs) functionalized with N-heterocyclic carbene (NHC) ligands immobilized ontographene are obtained via spontaneous decomposition of well-defined gold-NHC complexes by reducedgraphene oxide (rGO) without reducing agents. NHC ligands are responsible for the formation of air-stable, crystalline and small (3.0–4-0 nm) Au NPs homogeneously distributed on the surface of graphene.The catalytic properties of three Au NPs functionalized with different ligands were tested in two bench-mark reactions (hydration of alkynes and intramolecular hydroamination of alkynes). The results reveal apronounced ligand effect on the stability of Au NPs on graphene, by acting as a bridge between them. TheAu NPs functionalized with a NHC ligand lacking a polyaromatic group or having a naphthyl tag displayedlimited stability and fast deactivation in the first run. On the contrary, the Au NPs functionalized with aNHC ligand containing a pyrenyl handle showed superior catalytic activity and can be recycled at leastten times. The particle size of the Au NPs is preserved after the recycling process indicating a high stabil-ity. These results illustrate the use of purposely designed ligands having affinity for both Au NPs and gra-phene to increase the stability of the hybrid catalyst. [-]
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Journal of Catalysis Volume 394, February 2021, Pages 113-120Investigation project
CIU/AEI/FEDER(RTI2018-098237-B-C21, RTI2018-098237-B-C22, PID2019-105881RB-I0, UJI-B2018-23, E31_17R, MINECO/FPU15/03011Rights
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