Microstructures of ZnO and ZrO2 the corresponding composites have been grown by Vapor-Solid method. A detailed characterization their structural, compositional optical properties has performed. X-ray diffraction (XRD) Raman spectroscopy measurements, let us identify two main phases, wurtzite monoclinic ZrO2, reinforcing hypothesis ZnO/ZrO2 composite formation. Scanning Electron Microscopy obser...

Photoinduced, copper-catalyzed cross-coupling can offer a complementary approach to thermal (non-photoinduced) methods for generating C-X (X = C, N, O, S, etc.) bonds. In this report, we describe the first detailed mechanistic investigation of one of the processes that we have developed, specifically, the (stoichiometric) coupling of a copper-thiolate with an aryl iodide. In particular, we focu...

lithium disilicate nano-powders were synthesized via a mild condition hydrothermal reaction at 180 ºc for 48 and 72 h with a non stoichiometric1:2 li:si molar ratio in naoh aqueous solution using li2co3 and sio2.h2o as raw materials. the synthesized materials were characterized by powder x-ray diffraction (pxrd) technique and fourier transform infrared (ftir) spectroscopy. the xrd data showed t...

Growth of GaAs and In(x)Ga(1-x)As nanowires by the group-III assisted molecular beam epitaxy growth method on (001)GaAs/SiO(2) substrates is studied in dependence on growth temperature, with the objective of maximizing the indium incorporation. Nanowire growth was achieved for growth temperatures as low as 550 °C. The incorporation of indium was studied by low temperature micro-photoluminescenc...

An approach to unequivocally determine the three-dimensional orientation of optically manipulated NaYF4:Er(3+),Yb(3+) upconverting nanorods (UCNRs) is demonstrated. Long-term immobilization of individual UCNRs inside single and multiple resonant optical traps allow for stable single UCNR spectroscopy studies. Based on the strong polarization dependent upconverted luminescence of UCNRs it is pos...

A novel ambient pressure microwave assisted technique is developed in which silver and indium-modified ZnS is synthesized. The as-prepared ZnS is characterized by x-ray diffraction, UV-vis spectroscopy, x-ray photoelectron spectroscopy and luminescence spectroscopy. This procedure produced crystalline materials with particle sizes below 10 nm. The synthesis technique leads to defects in the cry...

The influence of reaction conditions and monomer selection on the resulting film composition and luminescence properties of poly(p-phenylene vinylene) (PPV) prepared by chemical vapor deposition is investigated. Greater aliphatic hydrocarbon incorporation into the polymer is observed when R,R′dibromo-p-xylene is used as the starting monomer, as compared to R,R′-dichloro-p-xylene. This differenc...

The thermostimulated luminescence (TSL) and Fourier transform infrared (FTIR) measurements were carried out for ten biogenic shells at room temperature (RT) and various temperatures in the range 200-800°C, at an interval of 50°C, for 1 hr duration. The glow curves of unannealed sample show only one peak at 330°C. The sample irradiated with a gamma dose of 500 Gy shows an additional peak at 130°...

Background: CdWO4 is a scintillator with some unique properties. For example, high density, thermal and chemical stability and so on. Different applications of this scintillator such as X-ray scintillator has been investigated thoroughly so far. However, there is limited number of studies reporting the characteristics of CdWO4 as an alpha counter. Materials and Methods: The CdWO4 powder was syn...

We used a combination of optically-detected x-ray absorption spectroscopy with molecular dynamics simulations to explore the origins of light emission in small (5 nm to 9 nm) Ge nanoparticles. Two sets of nanoparticles were studied, with oxygen and hydrogen terminated surfaces. We show that optically-detected x-ray absorption spectroscopy shows sufficient sensitivity to reveal the different ori...