Titre du document / Document title
Study of hafnium (IV) oxide nanoparticles synthesized by polymerized complex and polymer precursor derived sol-gel methods
Auteur(s) / Author(s)RAMOS-GONZALEZ R.
GARCIA-CERDA L. A.
ALSHAREEF H. N.
GNADE B. E.
QUEVEDO-LOPEZ M. A.
Résumé / Abstract
This work reports the preparation and characterization of hafnium (IV) oxide (HfO2
) nanoparticles grown by derived sol-gel routes that involves the formation of an organic polymeric network. A comparison between polymerized complex (PC) and polymer precursor (PP) methods is presented. For the PC method, citric acid (CA) and ethylene glycol (EG) are used as the chelating and polymerizable reagents, respectively. In the case of PP method, poly(acrylic acid) (PAA) is used as the chelating reagent. In both cases, different precursor gels were prepared and the hafnium (IV) chloride (HfCl4
) molar ratio was varied from 0.1 to 1.0 for the PC method and from 0.05 to 0.5 for the PP method. In order to obtain the nanoparticles, the precursors were heat treated at 500 and 800 °C. The thermal characterization of the precursor gels was carried out by thermogravimetric analysis (TGA) and the structural and morphological characterization by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The XRD patterns of the samples obtained by both methods shows the formation of HfO2
at 500 °C with monoclinic crystalline phase. The PC method exhibited also the cubic phase. Finally, the HfO2
nanoparticles size (4 to 11 nm) was determined by TEM and XRD patterns.
Revue / Journal TitleMaterials science forum
Source / Source
2010, vol. 644, pp. 75-78 [4 page(s) (article)]
Langue / Language
Editeur / Publisher
Trans Tech, Stafa-Zurich, SUISSE
Mots-clés d'auteur / Author Keywords
Localisation / Location
INIST-CNRS, Cote INIST : 21741, 35400018174178.0170
Nº notice refdoc (ud4) : 22736697