resumo
This study aims to assess a method for preparation of small and highly stable Ag nanoparticles by nanosecond laser ablation in liquid. Effect of liquid medium and laser fluence on the size, morphology and structure of produced nanoparticles has been studied experimentally. Pulses of a Nd:YAG laser of 1064 nm wavelength at 35 ns pulse width at different fluences were employed to irradiate the silver target in different environments (water, ethanol and acetone). The UV-Visible absorption spectra of nanoparticles exhibit surface plasmon resonance absorption peak in the UV region. STEM and TEM micrographs were used to evaluate the size and shape of nanoparticles. The stability of silver colloids in terms of oxidation at different liquid media was analyzed by SAED patterns. The results showed that characteristics of Ag nanoparticles and their production rate were strongly influenced by varying laser fluence and liquid medium. Particles from 2 to 80 nm of diameter were produced using different conditions and no oxidation was found in ethanol and acetone media. This work puts in evidence a promising approach to produce small nanoparticles by using high laser fluence energy. (C) 2017 Elsevier Ltd. All rights reserved.
palavras-chave
SILVER NANOPARTICLES; OPTICAL-PROPERTIES; METAL NANOPARTICLES; ALLOY NANOPARTICLES; AQUEOUS-SOLUTION; WATER; SIZE; WAVELENGTH; GOLD; AU
categoria
Optics; Physics
autores
Moura, CG; Pereira, RSF; Andritschky, M; Lopes, ALB; Grilo, JPD; do Nascimento, RM; Silva, FS
nossos autores
Augusto Luís Barros Lopes
Professor Auxiliar
João Grilo
Investigador Júnioragradecimentos
This work was supported by the project NORTE 01-0145_FEDER-000018 and by project UID/EEA/04436/2013, by FEDER funds through the COMPETE 2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) with the reference project POCI-01-0145-FEDER-006941. Thank the Cnpq and CAPES for financial support.