Mechanism of Formation of Nanocrystalline ZnO Particles through the Reaction of [Zn(acac)2] with NaOH in EtOH

Low-Temperature Synthesis of Nanometer-Sized Crystalline TiO2 Particles and Their Photoinduced Decomposition of Formic Acid

“…Clearly, the balance of and EtOH in the solvent is important for the crystal formation in the NAC-FAS process. The same has also been observed in other oxide systems such as ZnO (11,12) and Fe 2 O 3 (17). Figure 3 shows the dependence of the specific surface area (S) and the relative anatase crystallinity (X) on calcining temperature (T c ).…”

“…However, the particles prepared in these ways are unsuitable for photocatalysts because of low crystallinity, small surface area, and/or impurity (SO 4 2Ϫ ). A novel method for preparing various nanometer-sized metal oxides with high crystallinity at low temperatures (Ͻ373 K) has recently been developed (11)(12)(13). This method, termed nanometer-sized crystalline from alcoholic solution (NAC-FAS) method, involves the reflux of an H 2 O-alcohol mixed solution containing metal chelate complexes or metal salts.…”

Facile and Reproducible Synthesis of Nanostructured Colloidal ZnO Nanoparticles from Zinc Acetylacetonate: Effect of Experimental Parameters and Mechanistic Investigations

“…Furthermore, EDX mapping investigations (data not shown) evidence that organic residuals are predominantly located on the microrods, while the compact macroaggregates are predominantly composed of ZnO matrixes. The decomposition of acetylacetonate to acetate, as suggested by Inubushi et al, [20] was ruled out on the basis of the XRD pattern (see Figure S1). …”

“…The monitoring of the reaction of an ethanol solution of Zn(acac) 2 with NaOH and the possible reaction mechanism involving different intermediates has been reported earlier in the literature. [20] In the above-mentioned study, gas liquid chromatography (GLC) and highpressure liquid chromatography (HPLC) were used to monitor the products of C-C bond cleavage in the ligands and as an inference the local structure around zinc was postulated in the mechanism. In this work, a direct probe of the local structure at the Zn K-edge using EXAFS was used to obtain the local structure around zinc.…”

“…The controlled particle growth during nucleation is essential in order to produce nanoparticles of reasonable size distribution. From the literature, [20] the reaction steps that occur when Zn(acac) 2 reacts with an ethanol solution of NaOH are known to be the decomposition of acac -ligand and the subsequent formation of Zn-O-Zn bonded species during the reflux step. Moreover, few investigations have been carried out on the various equilibria between the zinc complexes in solution.…”