Zinc Hydroxyacetate and Its Transformation to Nanocrystalline Zinc Oxide

Abstract

The synthesis of nanocrystalline ZnO by thermal decomposition of zinc hydroxyacetate, Zn(5)(OH)(8)(CH(3)CO(2))(2)·nH(2)O, was investigated. The decomposition process was examined using X-ray diffraction, thermogravimetric analysis, mass spectrometry, electron microscopy, Brunauer-Emmett-Teller surface area analysis, and solid-state NMR spectroscopy. Intermediate Zn(5)(OH)(8)(CH(3)CO(2))(2)·nH(2)O phases form at temperatures up to 110 °C from the starting compound Zn(5)(OH)(8)(CH(3)CO(2))(2)·2H(2)O by partial dehydration. At ∼110 °C, 4 equiv of ZnO and 1 equiv of Zn(CH(3)CO(2))(2) are formed. Further heating causes Zn(CH(3)CO(2))(2) to decompose to acetone, acetic acid, acetic anhydride, and ZnO. Notably, a portion of Zn(CH(3)CO(2))(2) sublimes during the process. Overall, the product of the calcination is equiaxed ZnO nanocrystals of 20-100 nm diameter.

Microwave solvothermal decoration of the cellulose surface by nanostructured hybrid Ag/ZnO particles: a joint XPS, XRD and SEM study

“…(1), because the hydroxide ions and zinc cations are consumed into the newly created zinc hydroxide acetate, which is the very first precipitation product under such conditions (Biswick et al 2009;Moezzi et al 2013). The thermodynamic analysis strongly supports the model of the reaction mechanism involving the primary precipitation of the layered zinc hydroxide acetates (Biswick et al 2009) against interpretations involving zinc hydroxide formation from zinc acetate (Wang et al 2005): …”

Heat treatment of ZnO nanoparticles: new methods to achieve high-purity nanoparticles for high-voltage applications

“…S1 †). 11 The greater mass loss of the non-oriented nanoparticle system (ZA-8g) in the low temperature region was due to the larger surface area (33.6 m 2 g À1 ) accessible for water sorption in this sample compared to the sample based on the densely packed oriented nanoparticles (ZN-8g) (12.6 m 2 g À1 ) ( Table 1). It was reported in another paper that only a few nanoparticles deviated from perfect alignment as a result of lattice imperfection, and improper stacking in contacting areas among the primary nanoparticles 44 inside the ower-shaped particles.…”

“…The nanoparticles doubled in size while the submicron particles decreased from ca. Moezzi et al 11 reported that acetone, acetic acid, acetic anhydride and water evaporated in three steps at high temperatures during the thermal decomposition of ZHS into ZnO. Mouzon et al 45 modelled the transient structure during sintering.…”

“…6 The ZHS phase adsorbs impurities and forms hard aggregates of the nanoparticles in polymer nanocomposites. 11,13 Heat treatment is thus efficient in transforming the nanoparticles with a surface ZHS phase into pure ZnO, but the disadvantage is the accompanying undesirable nanoparticle sintering leading to larger particles/grains. 11,13 Heat treatment is thus efficient in transforming the nanoparticles with a surface ZHS phase into pure ZnO, but the disadvantage is the accompanying undesirable nanoparticle sintering leading to larger particles/grains.…”

Study of a sol–gel precursor and its evolution towards ZnO

“…Some works demonstrate the huge influence that ambient humidity 7 , precursor 8 or solvent 9 have on the pyrolysis of zinc acetate dihydrate (ZAD) and the subsequent formation of ZnO 10,11,12 . Other reports highlight the appearance of different intermediate compounds, such as hydroxyl-or anhydrous acetates 13 , oxo-acetates 14 or hydrated hydroxyl-acetates 15 when similar ZAD species degrade, giving rise to nanowires 16 , nanobelts 17 or other nanostructures 18,19,20 .…”