Low dimensional europium (Eu3+)-doped gadolinium oxide (Gd2O3) lanthanide nanostructures are synthesized by an effective and simple coprecipitation process followed by subsequent heat treatments. Transmission electron microscope (TEM) images indicate Eu3+-doped Gd2O3 nanostructures undergo significant morphological changes from nanorods to nanoparticles during thermal treatments. Nanostructures with different morphology, including nanotubes, strongly influence the photoluminescence properties. The dependence of luminescence lifetime on morphological nature of the nanostructures demonstrates that the one dimensional nanostructures such as nanorods and nanotubes have higher emission intensity with shorter lifetime. Our analysis suggests that the morphological transformation of the nanostructures plays the most important role in the behavior of radiative and nonradiative relaxation mechanisms, resulting in the overall photoluminescence properties.
The stability of silver nanoparticles on indium tin oxide coated glass substrates under atmospheric condition was
investigated. These nanoparticles were fabricated using electron beam lithography. Energy dispersive spectroscopy
analysis revealed a high concentration of sulfur in the silver nanoparticles exposed to laboratory air for 12 weeks at room
temperature. Morphological changes in the silver nanoparticles were also observed for nanoparticles stored under the
same conditions. In contrast, silver nanoparticles kept in vacuum did not show chemical or morphological changes after
12 weeks. The present work clearly shows the need to consider ambient exposure when using Ag nanoparticles for
We report on the growth and characterization of ZnO nanorods using chemical vapor deposition
(CVP) with and without graphite, wet chemical reaction and gold attached ZnO nanorods called
nanocomposites. Various novel arrangements of growth of uniform one dimensional ZnO nanostructures
were observed. The ZnO nanostructures and the composite materials were examined by X-ray diffraction
(XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), The results of
characterization demonstrated that ZnO nanostructures are one dimensional, the nanocomposites consist of
both gold nanoparticles and ZnO nanorods. The result also shows that the gold nanoparticles were tightly
attached on the nanorod surface. Our results suggest that ZnO nanostructures and nanocomposites are
useful for solar cell, sensor applications. The detail of the results will be presented.