Silver nanoparticles produced by laser ablation for a study on the effect of SERS with low laser power on N719 dye and Rhodamine-B

Author(s)

Villegas Borrero, Nelson Fabian ^[1] ; Clemente da Silva Filho, Jose Maria ^[1] ; Ermakov, Viktor A. ^[1] ; Marques, Francisco Chagas ^[1]

Affiliation

^[1] Univ Estadual Campinas, IFGW, BR-13083859 Campinas, SP - Brazil

• Document type: Journal article
• Source: MRS ADVANCES; v. 4, n. 11-12, p. 723-731, 2019.
• Web of Science Citations: 0

Abstract

The effect of surface-enhanced Raman spectroscopy (SERS) was investigated in N719 dye thin films deposited on silicon wafer with a thin film of silver nanoparticles (Ag-NPs) fabricated by laser ablation in an aqueous solution, using a NdYAG laser (lambda = 1064nm). Optical absorption spectroscopy of the Ag-NPs colloidal solution shows an absorption peak at lambda = 400nm, associated with a localized surface plasmon resonance in the Ag-Isff's. Scanning electron microscopy (SEM) reveals that these NPs have an approximately spherical shape, with their diameter being tunable by laser power intensity. Raman spectroscopy measurements were performed using low laser power to avoid damage to the N719 dye films. Thus, a small Raman signal is obtained. The Raman intensity was greatly increased when the N719 film was deposited on a substrate with a thin film of Ag-NPs due to the SERS effect. The process was also used in Rhodamine-B to clearly demonstrate the SERS effect obtained by the use of these NPs produced by laser ablation. (AU)

• FAPESP's process: 12/10127-5 - Research and development of nanostructured materials for electronic and surface physics applications
• Grantee: Fernando Alvarez
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/26385-6 - Development and study of nanoparticles that generates multiple excitons and plasmonic effects applied for solar cells
• Grantee: Viktor Ermakov
• Support Opportunities: Scholarships in Brazil - Post-Doctoral