Nanosized hexagonal plateletlike ZnO for nanophosphor applications

Abstract

Articles you may be interested inCharacteristics of ZnO nanostructures produced with [ DMIm ] BF 4 using ultrasonic radiation AIP Conf. Proc. 1502, 368 (2012); 10.1063/1.4769157 Magnetic and optical properties of monosized Eu-doped ZnO nanocrystals from nanoemulsionZnO hexagonal plateletlike materials have been synthesized by reacting of hexamethylenetetramine in an aqueous solution of Zn 2+ in the presence of sodium bis ͑2-ethylhexyl͒ sulfosuccinate emulsions as a structure-directing agent. The authors used a variety of analytical techniques, such as scanning electron microscopy, transmission electron microscopy, and x-ray diffraction to show that this synthesis method yields ZnO nanocrystals with a well-defined morphology. By changing the synthesis conditions, crystal size could also be controlled, for example, both micron-and nanometer-sized crystals were fabricated. Photoluminescence measurements have been carried out at various temperatures under the excitation with a cw He-Cd laser and a pulsed Nd 3+ : YAG laser. At higher excitation energies, whispering gallery mode emission appears in the spectrum.

Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder

“…This is associated with the stochastic nature of the resonator loop formation in the excited volume. qualitatively similar to the data of the film with ZnO hexagonal microdisks (Figure 5) [23] and to the integral spectrum intensity in the powder containing the NPs ZnO with an average particle size of 100 nm (Figure 6, curve 1) [8]. There is a tendency to sublinearity for a single ultra-narrow peak (386 nm) at the end of curve 2 (Figure 6), which can be explained by the redistribution of the SE energy on emerging random modes.…”

“…A fundamentally different character of the evolution of PL spectra was observed in nanopowder with one-dimensional NPs size distribution, with an average size ~ 100 nm with strong scattering, Figure 6, [8]. The ultra-narrow bands (0.2 nm) in PL spectra appeared in a chaotic sequence with irregular spectral intervals, unlike [23]. This is associated with the stochastic nature of the resonator loop formation in the excited volume.…”

Porous ZnO platelets via controlled thermal decomposition of zinc glycerolate

“…Since the availability of ZnO with platelet-like morphology is limited till now [12][13][14][15][16][17], and while such a material with nonisotropic morphology could be highly interesting with concern to its catalytical, optical and electronical properties, the question arises whether thermal decomposition of platelet-like Zn(gly) can be performed while maintaining its morphology. To this concern, as-prepared Zn(gly) was decomposed with fast, moderate and slow heating rates inside of a tube furnace.…”

“…Non-isotropic morphologies such as platelets are less often observed although they could be highly relevant for thin-films that exhibit an oriented reflection of light or a directed electrical conductivity. Such platelet-like ZnO has been yet gained by physicochemical techniques such as electrochemical deposition [12], radio-frequency sputtering [13], ultrasonic spray pyrolysis [14] as well as by applying long-chained amines/carboxylates for a structure-directed growth in solution [15][16][17].…”

Investigation on structural aspects of ZnO nano-crystal using radio-active ion beam and PAC

“…Another phenomenon of the samples are deviations in the expected intensities, which in these fits are compensated by using spherical harmonics preferred orientation in GSAS. However, for nano materials, producing textures during sample preparation in powder X-ray diffraction is less expected and can be explained by significant modifications in shapes as needles or platelets, the latter of these may form in ZnO samples, as is described by [30].…”