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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
Author(s) -
Primo Ana,
EsteveAdell Ivan,
Coman Simo.,
Candu Natalia,
Parvulescu Vasile I.,
Garcia Hermenegildo
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201508908
Subject(s) - graphene , materials science , catalysis , benzoic acid , facet (psychology) , benzene , nanotechnology , pyrolysis , chemical engineering , chemistry , organic chemistry , personality , psychology , social psychology , engineering , big five personality traits
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 ( ${\overline {{\rm{Au}}} }$ /fl‐G), while the lateral sides were 0.0.1 oriented. Comparison of the catalytic activity of ${\overline {{\rm{Au}}} }$ /fl‐G films with powders of unoriented Au NPs supported on graphene showed that ${\overline {{\rm{Au}}} }$ /fl‐G films exhibit six orders of magnitude enhancement for three gold‐catalyzed reactions, namely, Ullmann‐like homocoupling, CN 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.