Naslov
Generalized Nonaqueous Sol-Gel Synthesis of Different Transition Metal Niobate Nanocrystals and Analysis of the Growth Mechanism

Autori
Zhang, Lizhi ; Garnweitner, Georg ; Djerdj, Igor ; Antonietti, Markus ; Niederberger, Markus

Izvornik
Chemistry-an asian journal (1861-4728) 3 (2008), 4; 746-752

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
nanoparticles; ternary metal oxides; nonaqueous sol-gel synthesis; niobates; growth mechanism

Sažetak
A general nonaqueous route for the synthesis of phase-pure transition metal niobate (InNbO4, MnNb2O6, and YNbO4) nanocrystals has been developed based on a one-pot solvothermal reaction of niobium chloride and the corresponding transition metal acetylacetonates in benzyl alcohol at 200 °C. All the samples were carefully characterized by XRD, TEM, HRTEM, and EDS. The study of the crystallization mechanism of these niobate nanocrystals points to a two-step pathway. First, metal hydroxide crystals and amorphous niobium oxide are formed, followed by the generation of the metal niobate nanocrystals from these intermediates via a dissolution-recrystallization mechanism. The chemical reaction mechanisms, i.e., the processes responsible for the oxygen supply for oxide formation, were found to be rather complex, involving niobium-mediated ether elimination as main pathway, however accompanied by solvolysis of the acetylacetonate ligands and benzylation reactions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA