From Complex Inorganic Oxides to Ag-Bi Nanoalloy: Synthesis by Femtosecond Laser Irradiation

Autor(es):Mostrar menos -

Machado, Thales R. ^[1] ; Macedo, Nadia G. ^[1] ; Assis, Marcelo ^[1] ; Donate-Buendia, Carlos ^[2] ; Minguez-Vega, Gladys ^[2] ; Teixeira, Mayara M. ^[1] ; Foggi, Camila C. ^[1] ; Vergani, Carlos E. ^[3] ; Beltran-Mir, Hector ^[4] ; Andres, Juan ^[5] ; Cordoncillo, Eloisa ^[4] ; Longo, Elson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, CDMF, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

^[2] UJI, GROG, Inst Noves Tecnol Imatge INIT, Castellon De La Plana 12071, Castello - Spain

^[3] Univ Estadual Paulista UNESP, Fac Odontol, BR-14801385 Araraquara, SP - Brazil

^[4] UJI, Dept Quim Inorgan & Organ, Castellon De La Plana 12071, Castello - Spain

^[5] UJI, Dept Quim Fis & Analit, Castellon De La Plana 12071, Castello - Spain

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. 3, n. 8, p. 9880-9887, AUG 2018.
• Citações Web of Science: 2

Resumo

Bimetallic nanoalloys with a wide variety of structures and compositions have been fabricated through many diverse techniques. Generally, various steps and chemicals are involved in their fabrication. In this study, the synthesis of Ag-Bi nanoalloys by femtosecond laser irradiation of an inorganic oxide Ag2WO4/NaBiO3 target without any chemicals like reducing agents or solvent is presented. The interaction between these materials and the ultrashort pulse of light allows the migration of Ag and Bi atoms from the crystal lattice to the particles surfaces and then to the plasma plume, where the reduction of the positively charged Ag and Bi species in their respective metallic species takes place. Subsequently, the controlled nucleation and growth of the AgBi alloyed nanoparticles occurs in situ during the irradiation process in air. Although at the bulk level, these elements are highly immiscible, it was experimentally demonstrated that at nanoscale, the AgBi nanoalloy can assume a randomly mixed structure with up to 6 +/- 1 atom % of Bi solubilized into the face-centered cubic structure of Ag. Furthermore, the Ag-Bi binary system possesses high antibacterial activity against Staphylococcus aureus (methicillin-resistant and methicilin-susceptible), which is interesting for potential antimicrobial applications, consequently increasing their range of applicability. The present results provide potential insights into the structures formed by the Ag-Bi systems at the nanoscale and reveal a new processing method where complex inorganic oxides can be used as precursors for the controlled synthesis of alloyed bimetallic nanoparticles. (AU)

• Processo FAPESP: 17/12594-3 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Camila Cristina de Foggi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs