Paper Title:

Study of Hafnium (IV) Oxide Nanoparticles Synthesized by Polymerized Complex and Polymer Precursor Derived Sol-Gel Methods

Periodical Materials Science Forum (Volume 644)
Main Theme Advanced Electron Microscopy and Nanomaterials
Edited by Arturo Ponce and Darío Bueno
Pages 75-78
DOI 10.4028/
Citation Rodolfo Ramos-González et al., 2010, Materials Science Forum, 644, 75
Online since March 2010
Authors Rodolfo Ramos-González, L.A. García-Cerda, Husam N. Alshareef, B.E. Gnade, M.A. Quevedo-López
Keywords Hafnium Oxide, Nanoparticle, Polymer Precursor Method, Polymerized Complex Method, Sol-Gel (SG)
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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.