Publicação

Gold nanoparticles on zinc oxide imaged by electron microscopy

Detalhes bibliográficos
Resumo:	ZnO materials with different micro/nanoscale morphologies (needle-like, rods, flower-like and spheroidal) were preparedby different techniques. Gold was loaded (1% wt.) on the ZnO supports through a double impregnation method. Themorphology of the ZnO and Au/ZnO materials was analyzed by scanning electron microscopy (SEM) and energydispersiveX-ray spectroscopy (EDS). Scanning transmission electron microscopy (STEM) and a high-angle annular darkfield(HAADF) detector were used to detect the gold anoparticles. High-resolution transmission electron microscopy (HRTEM) of Au/ZnO was also performed. As gold is only catalytically active in the form of nanoparticles well dispersed on the support, it is very important to use electron microscopy methods that enable the determination of size, morphology,crystallinity and chemistry of nanoscale gold.
Assunto:	Instrumental analysis, Nanotechonology, Chemical engineering, Nano-technology Análise instrumental, Nanotecnologia, Engenharia química, Nanotecnologia
País:	Portugal
Tipo de documento:	livro
Tipo de acesso:	Restrito
Instituição associada:	Repositório Aberto da Universidade do Porto
Idioma:	inglês
Origem:	Repositório Aberto da Universidade do Porto

Descrição
Resumo:	ZnO materials with different micro/nanoscale morphologies (needle-like, rods, flower-like and spheroidal) were preparedby different techniques. Gold was loaded (1% wt.) on the ZnO supports through a double impregnation method. Themorphology of the ZnO and Au/ZnO materials was analyzed by scanning electron microscopy (SEM) and energydispersiveX-ray spectroscopy (EDS). Scanning transmission electron microscopy (STEM) and a high-angle annular darkfield(HAADF) detector were used to detect the gold anoparticles. High-resolution transmission electron microscopy (HRTEM) of Au/ZnO was also performed. As gold is only catalytically active in the form of nanoparticles well dispersed on the support, it is very important to use electron microscopy methods that enable the determination of size, morphology,crystallinity and chemistry of nanoscale gold.