Controlling Size, Morphology, and Surface Composition of AgAu Nanodendrites in 15 s for Improved Environmental Catalysis under Low Metal Loadings

Autor(es):Mostrar menos -

da Silva, Anderson G. M. ^[1] ; Rodrigues, Thenner S. ^[1] ; Slater, Thomas J. A. ^[2] ; Lewis, Edward A. ^[2] ; Alves, Rafael S. ^[1] ; Fajardo, Humberto V. ^[3] ; Balzer, Rosana ^[4] ; da Silva, Alisson H. M. ^[5] ; de Freitas, Isabel C. ^[1] ; Oliveira, Daniela C. ^[6] ; Assaf, Jose M. ^[5] ; Probst, Luiz F. D. ^[4] ; Haigh, Sarah J. ; Camargo, Pedro H. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs - England

^[3] Univ Fed Ouro Preto, Dept Quim, BR-35400000 Ouro Preto, Minas Gerais - Brazil

^[4] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC - Brazil

^[5] Univ Fed Sao Carlos, Dept Engn Quim, BR-13565905 Sao Carlos, SP - Brazil

^[6] Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 7, n. 46, p. 25624-25632, NOV 25 2015.
• Citações Web of Science: 23

Resumo

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. (AU)

• Processo FAPESP: 13/19861-6 - Nanomateriais metálicos controlados para aplicações em catálise
• Beneficiário: Pedro Henrique Cury Camargo
• Linha de fomento: Auxílio à Pesquisa - Regular