Influence of Different Alumina Precursors on Structural Properties and Morphology of ZnO‐Al₂O₃ Nanocomposite Powder

Abstract

The effect of different alumina precursors (aluminum nitride, aluminum hydroxide, and aluminum oxide) on morphology and the structural properties of ZnO-Al 2 O 3 nanocomposite prepared via chemical precipitation using urea hydrolysis was studied. The synthesized nanocomposites were systematically characterized by X-ray diffraction, thermal gravimetric, field-emission scanning electron microscopy, surface area analysis, and UV-vis absorption. In the case of aluminum hydroxide and aluminum oxide, a core-shell structure consisting of the ZnO nanoflakes on Al 2 O 3 particles was obtained. Aluminum nitrate precursor resulted in the ZnAl 2 O 4 spinel as the only crystalline phase. The characteristics of the synthesized nanocomposites strongly depend on the alumina sources. *hamid_tjz@yahoo.com

Graphene oxide—Polymethyl methacrylate coatings for Corrosion protection of aerospace aluminium alloy 7075—T651 surfaces

“…The peaks at 45, 65, 78°corresponds to (200), ( 220), (311) planes confirms the presence of aluminium in 48, GP 48, 72, GP 72 h samples respectively. The peaks at 21, 28, 30°corresponds to (110), (120), (004) planes in 48, GP 48, 72 h samples confirm the Al(OH) 3 formation respectively [21,22]. The XRD measurements when compared between GO-PMMA coated and uncoated samples, it is observed that the intensity of peaks are high in 24, 48, 72 h samples.…”

In situ synthesis of Al2O3‐supported ZnCr2O4 nanoparticles for application as an activated photocatalyst

“…The ZnCr 2 O 4 NPs were synthesized as described elsewhere, 24 3 (Bayerite-type, Ardakan Industrial Ceramics Co., Ardakan, Iran)] was used as an Al-containing precursor to provide Al 2 O 3 seeds in the precipitation media. 25,26 At the first step, zinc acetate dehydrate and chromium nitrate were mixed with the molar ratio of 1:2 to obtain a 0.3 mol/L solution, and then a large amount of urea was added to the solution under string to adjust the molar ratio of urea: [Zn 2+ +Cr 3+ ] to 6:1. In order to provide Al ions, an adequate amount of aluminum hydroxide solution [Al(OH) 3 (3 lm, Bayerite-type, Ardakan Industrial Ceramics Co., Iran)] was added into the suspension during stirring.…”

Phase Transformation and Optical Properties of Annealed Hydrothermally Synthesized ZnO/ZnCr2O4 Nanocomposites

“…[6][7][8][9] In particular, ZnCr 2 O 4 is one of the best example of ternary semiconductors with spinel structure has attracted many attention of scientific community due to its high thermodynamic stability and unique sensing properties. 4,6 In recent past, ZnO-and ZnCr 2 O 4 -based nanostructure has been synthesized by various techniques such as, chemical vapor deposition, wet chemical bath deposition, spray pyrolysis, metal-organic chemical vapor deposition, sol-gel, pulsed laser deposition, [10][11][12][13][14][15][16][17][18] high-temperature solid-state reaction, 19 and hydrothermal techniques. 4,20 Among all these methods, hydrothermal fabrication technique to synthesize ZnO and ZnCr 2 O 4 nanostructures is appealing for their low growth temperatures and large area-based applications.…”