title: Controlling Size, Morphology, and Surface Composition of AgAu Nanodendrites in 15 s for Improved Environmental Catalysis under Low Metal Loadings.
abstract: In this work, a simple but powerful method for controlling the size and surface morphology of AgAu nanodendrites is presented. Control of the number of Ag nanoparticle seeds is found to provide a fast and effective route by which to manipulate the size and morphology of nanoparticles produced via a combined galvanic replacement and reduction reaction. A lower number of Ag nanoparticle seeds leads to larger nanodendrites with the particles' outer diameter being tunable in the range of 45-148 nm. The size and surface morphology of the nanodendrites was found to directly affect their catalytic activity. Specifically, we report on the activity of these AgAu nanodendrites in catalyzing the gas-phase oxidation of benzene, toluene and o-xylene, which is an important reaction for the removal of these toxic compounds from fuels and for environmental remediation. All produced nanodendrite particles were found to be catalytically active, even at low temperatures and low metal loadings. Surprisingly, the largest nanodendrites provided the greatest percent conversion efficiencies.
authors.affiliation: Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, São Paulo, São Paulo 05508-000, Brazil.
authors.forename: Anderson G M
authors.initials: AG
authors.lastname: da Silva
authors.affiliation: Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, São Paulo, São Paulo 05508-000, Brazil.
authors.forename: Thenner S
authors.initials: TS
authors.lastname: Rodrigues
authors.affiliation: School of Materials, The University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: Thomas J A
authors.initials: TJ
authors.lastname: Slater
authors.affiliation: School of Materials, The University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: Edward A
authors.initials: EA
authors.lastname: Lewis
authors.affiliation: Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, São Paulo, São Paulo 05508-000, Brazil.
authors.forename: Rafael S
authors.initials: RS
authors.lastname: Alves
authors.affiliation: Departamento de Química, Universidade Federal de Ouro Preto , Ouro Preto, Minas Gerais 35400-000, Brazil.
authors.forename: Humberto V
authors.initials: HV
authors.lastname: Fajardo
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina , Florianópolis Santa Catarina, 88040-900, Brazil.
authors.forename: Rosana
authors.initials: R
authors.lastname: Balzer
authors.affiliation: Departamento de Engenharia Química, Universidade Federal de São Carlos , São Carlos, São Paulo 13565-905, Brazil.
authors.forename: Alisson H M
authors.initials: AH
authors.lastname: da Silva
authors.affiliation: Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, São Paulo, São Paulo 05508-000, Brazil.
authors.forename: Isabel C
authors.initials: IC
authors.lastname: de Freitas
authors.affiliation: Laboratório Nacional de Luz Síncrotron , Campinas, São Paulo 13083-970, Brazil.
authors.forename: Daniela C
authors.initials: DC
authors.lastname: Oliveira
authors.affiliation: Departamento de Engenharia Química, Universidade Federal de São Carlos , São Carlos, São Paulo 13565-905, Brazil.
authors.forename: Jose M
authors.initials: JM
authors.lastname: Assaf
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina , Florianópolis Santa Catarina, 88040-900, Brazil.
authors.forename: Luiz F D
authors.initials: LF
authors.lastname: Probst
authors.affiliation: School of Materials, The University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: Sarah J
authors.initials: SJ
authors.lastname: Haigh
authors.affiliation: Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, São Paulo, São Paulo 05508-000, Brazil.
authors.forename: Pedro H C
authors.initials: PH
authors.lastname: Camargo
keywords: BTX oxidation; bimetallic; gold; nanodendrites; silver