title: One-Step Pyrolysis Preparation of 1.1.1 Oriented Gold Nanoplatelets Supported on Graphene and Six Orders of Magnitude Enhancement of the Resulting Catalytic Activity.
abstract: Pyrolysis of chitosan films containing Au(3+) renders 1.1.1 oriented Au nanoplatelets (20 nm lateral size, 3-4 nm height) on a few layers of N-doped graphene (Au/fl-G), while the lateral sides were 0.0.1 oriented. Comparison of the catalytic activity of Au/fl-G films with powders of unoriented Au NPs supported on graphene showed that Au/fl-G films exhibit six orders of magnitude enhancement for three gold-catalyzed reactions, namely, Ullmann-like homocoupling, C-N cross coupling, and the oxidative coupling of benzene to benzoic acid. This enhancement is the result of the defined morphology, facet orientation of Au nanocrystals, and strong gold-graphene interaction.
authors.affiliation: Instituto Universitario de Tecnología Química CSIC-UPV, Universidad Politécnica de Valencia, Avda. de los Naranjos s/n, 46022 Valencia (Spain).
authors.forename: Ana
authors.initials: A
authors.lastname: Primo
authors.affiliation: Instituto Universitario de Tecnología Química CSIC-UPV, Universidad Politécnica de Valencia, Avda. de los Naranjos s/n, 46022 Valencia (Spain).
authors.forename: Ivan
authors.initials: I
authors.lastname: Esteve-Adell
authors.affiliation: Department of Organic Chemistry, Biochemistry, and Catalysis, University of Bucharest, Bd. Regina Elisabeta nr. 4-12, 030018 Bucharest (Romania).
authors.forename: Simona N
authors.initials: SN
authors.lastname: Coman
authors.affiliation: Department of Organic Chemistry, Biochemistry, and Catalysis, University of Bucharest, Bd. Regina Elisabeta nr. 4-12, 030018 Bucharest (Romania).
authors.forename: Natalia
authors.initials: N
authors.lastname: Candu
authors.affiliation: Department of Organic Chemistry, Biochemistry, and Catalysis, University of Bucharest, Bd. Regina Elisabeta nr. 4-12, 030018 Bucharest (Romania). vasile.parvulescu@chimie.unibuc.ro.
authors.forename: Vasile I
authors.initials: VI
authors.lastname: Parvulescu
authors.affiliation: Instituto Universitario de Tecnología Química CSIC-UPV, Universidad Politécnica de Valencia, Avda. de los Naranjos s/n, 46022 Valencia (Spain). hgarcia@qim.upv.es.
authors.forename: Hermenegildo
authors.initials: H
authors.lastname: Garcia
keywords: coupling catalysts; graphene support; heterogeneous catalysis; oriented gold nanoparticles