Chemical Purification of ZnO Nanoparticles by Dialyzing Treatments and Their Use in Fabricating Luminescent Antireflective Nanocomposite Thin Films

Abstract

ZnO nanoparticles were prepared by a chemical solution method using the reaction between Zn(CH3COO)2·2H2O and LiOH·H2O in an ethanol solvent. A dialyzing treatment of the resultant chemically impure nanoparticles was introduced in the present work, aiming at increasing their chemical purity in terms of adsorbed species. The progress of dialysis was monitored with electrical conductivity of dialysate. X-ray diffraction analysis and Fourier transform infrared spectroscopy were employed to check the chemical purity of the ZnO nanoparticles after the dialyzing treatment. Furthermore, the dialyzed ZnO nanoparticles were utilized to fabricate ZnO/SiO2 nanocomposite thin films by a sol−gel method with a dip-coating technique. Stable coating solutions were obtained only with the dialyzed ZnO nanoparticles, which also indicated their chemical purity. The nanocomposite thin films exhibited a unique optical property with antireflection against visible light and photoluminescence under irradiation with ultraviolet light.

Chemometric Analytical Approach for the Cloud Point Extraction and Inductively Coupled Plasma Mass Spectrometric Determination of Zinc Oxide Nanoparticles in Water Samples

“…However, due to the effect of ionic strength on the extraction efficiency, 15 mM NaCl was added, and the extraction efficiency increased to (87.4 ± 2.7)% ( n = 3). While preconcentration factors of the purification techniques of ZnO NPs such as solvent extraction and dialysis were about 10, − a preconcentration factor of 62 was achieved under the optimum conditions. CPE efficiency was further examined on various concentrations of ZnO NPs.…”

“…There have been few quantitative methods introduced for the determination of ENMs. − While several published papers have focused on the toxicity and bioavailability (in particular, solubility) assessment of ZnO NPs, data on the determination of ZnO NPs are scarce . Techniques for the separation of ZnO NPs, such as solvent extraction , and dialysis, are focused on the purification of synthetic ZnO NPs and the elimination of impurities. Thus, these approaches are not directly involved with the quantitative analysis of these materials.…”

Synergism between Specific Halide Anions and pH Effects during Nanosecond Laser Fragmentation of Ligand-Free Gold Nanoparticles

“…The synthesis of AuNCs is primarily done by chemical methods, however, only in the presence of ligands. − Each of these wet chemical syntheses results in particles with surfaces that are occupied by organic ligands. Although many groups have worked on ligand-exchange procedures, these endeavors are almost never quantitative. − The study of the ligand-occupied surfaces of particles is difficult because the first two atomic layers appear amorphous due to organic ligands, and the chemical nature of the surface is dominated by the properties of the ligands rather than the properties of gold . The effects of the ligands and the core cannot be differentiated, so there is a demand for ligand-free AuNCs that are not accessible by chemical synthesis.…”

Size control of laser-fabricated surfactant-free gold nanoparticles with highly diluted electrolytes and their subsequent bioconjugation

“…[5][6][7] Size control of Au NPs can be easily done by chemical synthesis using artificial ligands. 8,9 However, up to date these ligands cannot be quantitatively exchanged 10 or removed [11][12][13] and they drastically interfere with toxicity assays. This was, e.g.…”