Controllable Synthesis and Optical Properties of Connected Zinc Oxide Nanoparticles

Abstract

Connected zinc oxide (ZnO) nanoparticles are successfully synthesized by a simple solution-based chemical route that uses evaporation and concentration technology. The influences of processing parameters, especially the evaporation and concentration time on the size and morphology of the nanoparticles, have been investigated by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). The structure and optical properties are systematically characterized by X-ray diffraction (XRD), UV/Vis spectrophotometery, and fluorescence spectroscopy (FL). It is found that the average diameter and morphology are strongly affected by the evaporation and concentration time. Additionally, the formation mechanism of the nanoparticles is also discussed. The studies revealed that the evaporation and concentration are important aggregation or nucleation processes for ZnO growth, which leads to the macro-differences in morphology. These results provide some insight into the growth mechanism of ZnO nanostructures. The synthetic strategy developed in this study may also be extended to the preparation of other nanomaterials and promising applications in various fields of nanotechnology.

Facile method to synthesize magnetic iron oxides/TiO2 hybrid nanoparticles and their photodegradation application of methylene blue

“…The main mechanism of light absorption in pure semiconductors is direct interband electron transitions. The absorption coefficient α has been calculated from the Lamberts formula [62], $\alpha MathClass-rel=\frac{1}{t}qopnameln\left(\frac{1}{T}\right)$, where T and t are the transmittance (can be directly measured by UV-vis spectra) and path length of the colloids solution (same concentration), respectively. A typical plot of ( α hν) 2 versus photon energy (hν) for the samples are shown in Figure 9b.…”

In vitro physiological and antibacterial characterization of ZnO nanoparticle composites in simulated porcine gastric and enteric fluids

“…Thus, the antimicrobial activity has been mainly attributable to the dissolved zinc species [ 20 – 24 ]. The dissolution of ZnO nanoparticles and Zn 2+ release seem to be able to generate radical oxygen species (ROS), consequently, activating a cytotoxic cascade of events that include intracellular calcium flux, mitochondrial depolarization, and plasma membrane leakage [ 25 – 28 ].…”

Wetting properties and SERS applications of ZnO/Ag nanowire arrays patterned by a screen printing method

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