2-Aminoethanol-mediated wet chemical synthesis of ZnO nanostructures

Abstract

The synthesis of ZnO nanostructures via coprecipitation of Zn(NO 3 ) 2 Á2H 2 O in 2-aminoethanol under different reaction conditions is presented. The effect of temperature and time on crystal structure, size, morphology, and optical properties of ZnO nanopowders is studied. XRD analyses demonstrate that single crystalline wurtzite ZnO nanostructures are instantaneously formed at higher temperature, or at low temperature with growth times equal to 2 h. However, the mean crystallite size increases as a function of reaction temperature and growth time. XRD and SEM results reveal that ZnO nuclei grow along favored crystallographic planes [wurtzite (101)] in 2-aminoethanol to form single crystalline nanorods. The optical band-gap energies of ZnO crystallites measured from their UV absorption spectra increase from 3.31 to 3.52 eV with decreasing particle size. ZnO nanopowders also exhibit good photoluminescent characteristics with strong UV and weak visible (violet, blue) light emissions corresponding to surface defects and oxygen vacancies in ZnO products.

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

“…ZnO nanoparticles were synthesized by the precipitation method using zinc nitrate hexahydrate (Zn(NO 3 ) 2 .6H 2 O purum p.a., crystallized, ≥99.0%, SigmaAldrich) as a precursor, and ethanolamine (≥98.0%, SigmaAldrich) as the solvent as well as the surfactant (Naz et al, 2015). Firstly, 20 ml distilled ethanolamine was taken in a 250 ml round bottom flask.…”

Low-Temperature-Processed ZnO Electron Transport Layers for PbS Colloidal Quantum Dot-Based Solar Cells

“…In brief, ZnO NPs were synthesized via a reflux method by dissolving zinc acetate in low boiling point solvent 2-aminoethanol, which acted as a stabilizing ligand. The 2-aminoethanol stabilizer is to control the rate of the reaction and growth of ZnO nanoparticles and also the surface morphology (size, shape, and distribution) . The purpose of the reflux is to remove some intermediate complexes such as zinc-oxo-acetate, acetic acid, and water, leaving behind an intermediate phase of zinc hydroxide Zn­(OH) 2 , which is finally converted into a ZnO film upon heating at a relatively low temperature, i.e.…”

“…In brief, ZnO NPs were synthesized via a reflux method by dissolving zinc acetate in low boiling point solvent 2-aminoethanol, which acted as a stabilizing ligand. The 2-aminoethanol stabilizer is to control the rate of the reaction and growth of ZnO nanoparticles and also the surface morphology (size, shape, and distribution) 24. The purpose of the reflux is to remove some intermediate complexes such as zinc-oxo-acetate, acetic acid, and water, leaving behind an intermediate phase of zinc hydroxide Zn(OH) 2 , which is finally converted into a ZnO film upon heating at a relatively low temperature, i.e., 120 °C.The quality and microstructures of the as-fabricated ZnO films were characterized using different techniques.…”

Biocompatible Graphene Oxide Nanosheets Densely Functionalized with Biologically Active Molecules for Biosensing Applications

“…To improve the GO coating stability and coverage, other recent developments have focused on the covalent attachment of alkoxysilane cross-linkers to surface hydroxyl groups scattered across the GO plane. 3-Aminopropyl-triethoxysilane (APTES) has been a common choice, even though APTES modification can promote the formation of inhomogeneous and multilayered coatings, which render this approach largely inadequate for applications involving nanostructures. ,− As a promising alternative, the colamine (CA) (β-hydroxyethylamine) cross-linker, originating from single-molecule atomic force spectroscopy, has recently shown superior functionalization performance for nanoscale semiconductor structures, for which it can provide dense and homogeneous monolayer coatings. ,− Comparable with the covalent attachment of APTES to surface hydroxyl groups, CA forms covalent ether links with hydroxyl groups via a condensation reaction. ,,, In the case of GO, CA covalently ligates to both epoxides and abundant hydroxyl groups across the GO material plane, resulting in a significant increase in overall coating coverage.…”

“…21,31−33 Comparable with the covalent attachment of APTES to surface hydroxyl groups, CA forms covalent ether links with hydroxyl groups via a condensation reaction. 31,32,34,35 In the case of GO, CA covalently ligates to both epoxides and abundant hydroxyl groups across the GO material plane, resulting in a significant increase in overall coating coverage.…”