SciELO - Scientific Electronic Library Online

 
vol.83 número195Mechanical and thermal performance of a geopolymeric and hybrid material based on fly ashEvaluation of internal and external stresses on the SPT sampler índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Não possue artigos similaresSimilares em SciELO
  • Em processo de indexaçãoSimilares em Google

Compartilhar


DYNA

versão impressa ISSN 0012-7353

Resumo

ACOSTA-HUMANEZ, Manuel; MONTES-VIDES, Luis  e  ALMANZA-MONTERO, Ovidio. Sol-gel synthesis of zinc oxide nanoparticle at three different temperatures and its characterization via XRD, IR and EPR. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.195, pp.224-228. ISSN 0012-7353.  http://dx.doi.org/10.15446/dyna.v83n195.50833.

In this work, nanoparticles of zinc oxide were synthesized; they were formed using the sol-gel method (citrate route) at calcination temperatures (Tc) of 500, 550 and 600 °C. For all samples studied, IR spectroscopy showed the presence of the bands associated with water molecules present in the zinc oxide and carbon dioxide adsorbed on its surface. The formation of zinc oxide phase was confirmed by XRD, which showed that from 500 ºC it had this type of Wurtzite structure. However, samples calcinated at 600 ºC have higher crystallinity. Crystallite size was calculated using the Scherrer equation. The Rietveld method was used to obtain lattice parameters a and c for Wurtzite cell types as well as cell volume and the ratio c/a of each sample. These parameters do not show significant changes when they are compared with values obtained from samples with different calcination temperatures. Electron paramagnetic resonance showed the presence of defects in the zinc oxide. Three signals with g values of 1.96, 2.00 and 2.04 were associated with oxygen and zinc vacancies. Defects in the structure disappear when the calcination temperature is increased. The sample that was highlighted with the highest concentration of vacancies has a mean crystallite size greater than 30 nm, and this may also be responsible for this feature.

Palavras-chave : X-Ray diffraction; IR spectroscopy; sol-gel method; electron paramagnetic resonance; zinc oxide.

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )