Assisted laser ablation: silver/gold nanostructures coated with silica

Autor(es)

Gonzalez-Castillo, J. R. ^[1] ; Rodriguez-Gonzalez, Eugenio ^[1] ; Jimenez-Villar, Ernesto ^[2] ; Cesar, Carlos Lenz ^[3] ; Antonio Andrade-Arvizu, Jacob ^[4]

Afiliação do(s) autor(es)

^[1] CICATA UA, Inst Politecn Nacl, Altamira 89600 - Mexico

^[2] Univ Fed Pernambuco, DQF, BR-50670901 Recife, PE - Brazil

^[3] Univ Estadual Campinas, IFGW DEQ, BR-13083859 Campinas, SP - Brazil

^[4] Inst Politecn Nacl, Escuela Super Fis & Matemat, Mexico City 07738, DF - Mexico

• Tipo de documento: Artigo Científico
• Fonte: APPLIED NANOSCIENCE; v. 7, n. 8, p. 597-605, NOV 2017.
• Citações Web of Science: 4

Resumo

The synthesis processes of metallic nanoparticles have seen a growing interest in recent years, mainly by the potential applications of the phenomenon of localized surface plasmon resonance associated with metallic nanoparticles. This paper shows a fast method to synthesize silver, gold and silver/gold alloy nanoparticles coated with a porous silica shell by the assisted laser ablation method in three steps. The method involves a redox chemical reaction where the reducing agent is supplied in nanometric form by laser ablation. In the first step, a silicon target immersed in water is ablated for several minutes. Later, AgNO3 and HAuCl4 aliquots are added to the solution. The redox reaction between the silver and gold ions and products resulting from ablation process can produce silver, gold or silver/gold alloy nanoparticles coated with a porous silica shell. The influence of the laser pulse energy, ablation time, Ag+ and Au3+ concentration, as well as the Ag+/Au3+ ratio, on optical and structural properties of the nanostructures was investigated. This work represents a step forward in the study of reaction mechanisms that take place during the synthesis of nanoscale materials by the assisted laser ablation technique. (AU)

• Processo FAPESP: 17/05854-9 - Localização de luz: uma maneira para construção de dispositivos fotônicos avançados
• Beneficiário: Niklaus Ursus Wetter
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional