Nanocrystalline Bimetallic Oxides from Molecular Precursors

Abstract

Synthesis of bimetallic oxides from individual components poses a challenge on the conventional material processing methods largely due to the differences in the intrinsic chemical behaviour of the starting materials that leads to undesired stoichiometries and residual monometal phases in the final material. To a large extent, this limitation can be overcome by employing metalorganic precursors that contain all atomic constituents, required to form the target solid-state phase, in a single molecule. The fact that the extended solid-state structure is derived from molecular building blocks substantiates the inherent advantages of chemical methods due to controlled and defined reaction chemistry. We have examined the single-step conversion of various heterometal alkoxides via Sol-Gel process to obtain nanocrystalline bimetallic oxides with homogeneous particle sizes and narrow size-distributions.

Observation on Volatile and Nonvolatile Magnetic Reversions Mediated by Electric Current in Highly Conductive Gd3Fe5O12

“…The Gd 3 Fe 5 O 12 sample is synthesized in the polycrystalline form by sol–gel. − The surface morphology and elemental composition of the hydrogel are characterized by scanning electron microscope (SEM) and EDS (Carl Zeiss, G300 FE-SEM System, Germany). The XPS (Thermo ESCALAB 250 Xi) is conducted to detect valence states.…”

Air-Stable Gadolinium Precursors for the Facile Microwave-Assisted Synthesis of Gd2O3 Nanocontrast Agents for Magnetic Resonance Imaging

“…On the other hand, the single source precursors method involves thermal decomposition of a single molecule (e.g., β-diketonate, alkoxide) in a hot appropriate coordinating solvent. It generally produces regular NPs at lower temperatures. − Nevertheless, such a synthesis route demands adequate molecular precursors with a defined chemical composition for the synthesis of desired NPs.…”

Nanostructured ZrO2 membranes prepared by liquid-injection chemical vapor deposition

“…The use of such single molecular sources simplifies the growth procedure significantly and allows a precise control over phase composition and particle size of the films [38][39][40][41][42]. The thermal decomposition of the precursor in liquid-injection MOCVD process was investigated as a function of substrate temperature and injection frequency that allowed tuning the crystalline phase, film thickness and density of the as-deposited zirconia.…”