Polyol‐Mediated Synthesis of Nanoscale Functional Materials

Abstract

transparent conducting oxides (ZnO:In 3+ ), and catalytically active oxides (CeO 2 ; Mn 3 O 4 ; V 2 O 5 ) are prepared with the polyol method. All these materials are yielded as crystalline, spherical, and almost monodisperse particles, 30±200 nm in size. Characterization is carried out based on scanning electron microscopy (SEM), X-ray powder diffraction (XRD), optical spectroscopy, and conductance measurements. The preparation via the polyol method is singled out due to its broad and easy applicability. The resulting material properties are similar to or better than nanoscale materials prepared by other measures. Some materials and their properties, e.g., ZnS:Ag + ,Cl ± as a phosphor, ZnCo 2 O 4 and Cu(Fe,Cr)O 4 as pigments, and ZnO:In 3+ as transparent conductive oxide, are presented for the first time at the nanoscale.

Fabrication and Characterization of ZnO Nano-Clips by the Polyol-Mediated Process

“…Increasing the solution concentration to 0.015 M, ZnO nano-clips disappear and only ZnO nanoparticles with elliptical shapes (~ 435 × 200 nm) can be formed in Fig. 3a, similar to previous literature results [25, 28, 30]. With further increasing of the solution concentration to 0.05 M, the SEM image shows mixture of elliptical (~ 220–260 × 100–140 nm) or spherical (100–260 nm) particles with several micrometer irregular aggregates in Fig.…”

Toxicological Effect of ZnO Nanoparticles Based on Bacteria

“…We report preliminary studies on the toxicological effect of ZnO NPs synthesized in an EG aqueous medium on S. agalactiae and S. aureus . Our experimental results revealed that low concentrations of ZnO NPs did not induce any cellular damage, as also demonstrated by other researchers. 1a,, Moreover, these cells, after contact with PVA-coated ZnO NP concentrations higher than 0.016 M in the EG aqueous medium, were damaged, and there was a great change in the crystal structure of ZnO NPs. Cellular internalization of these NPs was observed.…”

Hierarchically Structured Cobalt Oxide (Co3O4): The Morphology Control and Its Potential in Sensors

“…With different initial Co(CH 3 COO) 2 ·4H 2 O concentrations, the sphere diameters varied from 100 to 600 nm. Such a sphere shape is consistent with the typical polyol process, in which the precipitates will adopt a spherical shape with minimal surface energy. , The energy-disperse X-ray (EDX) spectroscopic analysis (inset in Figure a) of the spheres indicated the existence of cobalt. From the time-dependent experiments, we found that the as-synthesized spheres ( t = 0 min, Sample A) gradually changed their morphology during the heating process.…”