Suparat Tuscharoen

Measurement of Mass Attenuation Coefficients of Blue Sapphire at Different Photon Energy by Compton Scattering Technique

The mass attenuation coefficients of blue sapphire were measured at the different energy of γ-rays using the Compton scattering technique. There are in good agreement of scattered gamma rays energies between theoretical value and experimental value, reflecting the validation of Compton scattering system setup. The results show that, the experimental values of mass attenuation coefficient are in good agreement with the theoretical values. The mass attenuation coefficients increase with the decrease in gamma rays energies. This may be attributed to the higher photon interaction probability of blue sapphire at lower energy. This result is a first report of mass attenuation coefficient of blue sapphire at different gamma rays energies.

Functionalization of Au Nanoparticles on ZnO Nanorods through Low-Temperature Synthesis

Hybrid nanomaterials exhibit multi-functionalities, which is synergy or enhanced physical and optical properties over their single components with promising potentials for various applications in dye-sensitized solar cell and photocatalytic materials. In this present research, the Au nanoparticles were prepared at HAuCl4 concentration of 0.5 mM on ZnO nanorod templates and silicon wafer substrate by hydrothermal reaction process. The prepared samples were investigated the crystal structure, chemical composition and morphologies by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and field-emission scanning electron microscopy (FESEM), respectively. The XRD results shown that ZnO was preferred orientation along the c-axis (002). The FE-SEM images indicated to the difference of size-Au NPs decorated on ZnO nanorods and silicon wafer. The relationship between the surface area and the size of Au NPs of the prepared samples was investigated and possible growing mechanism of Au NPs on ZnO nanorods templates will be discussed.

Development of Barium Borosilicate Glass Using Rice Husk Ash: Effect of BaO

This paper is report on the physical and optical properties of development barium-borate-rice husk ash (BaBRHA) glass system. The glasses containing BaO in xBaO:(80-x)B2O3:20RHA where x = 30, 35, 40 and 45 wt% have been prepared by melt quenching technique. The physical properties of this glass are shown from density data. The optical properties were investigated from refractive index and transmission by using Abbe-refractometer and UV-visible spectrometer respectively.

The Mass Attenuation Coefficients and Effective Atomic Numbers of Ruby from Vietnam at Different Photon Energies

The mass attenuation coefficients and effective atomic numbers of ruby from Vietnam were measured at the different energy of γ-rays using the Compton scattering technique. The compositions of ruby were analyzed by energy dispersive x-rays fluorescence spectrometer and showed the Al2O3 is major composition. The results of the experimental values of mass attenuation coefficients and effective atomic numbers showed the good agreement with the theoretical values. The mass attenuation coefficients decreased with the increasing in gamma rays energies, due to the higher photon interaction probability of ruby at lower energy. The effective atomic numbers found to be constant around 10.0 electrons/atom.

Structural Studies of Lead Sodium Borate Glasses

Glass compositions xPbO : 20Na2O : (80-x)B2O3 (x = 5,10,15,20,25,30,35,40,45,50 and 55 %mol) have been prepared using melt-quenching method. The density and molar volume of these glass samples have been found to be compositional dependent. The results indicate that PbO acts on the glass structures were different between the range 0≤ x ≤ 20 %mol and beyond x = 20 %mol (with inflection at x = 20 %mol). These due to the PbO can enter the glass network both as a network modifier and also as a network former. This role depends on the type of bond between lead and oxide. These results are interpreted in term of IR analysis.

Influence of Growth Conditions on Morphology of ZnO Nanorods by Low-Temperature Hydrothermal Method

Zinc oxide (ZnO) nanorods (NRs) promise high potentials in several applications, such as photovoltaic device, thermoelectric device, sensor and solar cell. In this research, the vertical alignment of ZnO NRs was fabricated by hydrothermal method with various precursor concentrations and growth time on different seed layers (ZnO and Au), which deposited on silicon wafer substrate (100). The crystalline structure and morphology of ZnO NRs have been characterized by x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) techniques, respectively. The x-ray diffraction pattern shows that the prepared samples have a strong preferred orientation (002) plane. FE-SEM images of the ZnO NRs, it found that the density and aspect ratio were strongly influenced by the seed layer and precursor concentration. In addition, the aspect ratio of ZnO NRs was increased with increasing growth time. This study provides a cost effective method for the fabrication of well aligned ZnO NRs for nano-electronic devices.

Mass Attenuation Coefficients and Partial Interactions of BaO-ZnO-B2O3 Glasses System

The mass attenuation coefficients and partial interactions of BaO-ZnO-B2O3 glasses have been investigated using WinXCom program at difference photon energy. BaO-ZnO-B2O3 glasses were prepared in composition xBaO: 20ZnO: (80-x)B2O3 (where x = 15 and 20 mol %) by melt quenching technique under normal atmosphere. The densities of glasses are 3.0052 and 3.1022 g/cm3, respectively. The mass attenuation coefficients at 20% mol are higher than 15% mol of BaO in all energy range. The optical spectra were measured and good transparent behavior was obtained. Half value layer (HVL) of glasses are also report and compared with same standard shielding materials and show better shielding than ordinary concrete.

Growth of Nanostructure Silver Films by DC Magnetron Sputtering for Surface Enhanced Raman Scattering Substrate

Nanostructure silver films were obtained by dc magnetron sputtering at room temperature. The influences of deposition time on the morphology and optical properties were studied by field-emission scanning electron microscope and UV-vis NIR spectrophotometer. It was found that the optical properties of the nanostructure silver film can be effect by surface morphology. The surface enhanced Raman scattering activities of nanostructure Ag films were demonstrated by methylene blue (MB) as probing molecules while the detection limit of MB was found to be as low as 10-5 M from this SERS substrate.

Effective Atomic Numbers and Electron Densities of BaO-Na2O-B2O3-SiO2 Glass System: Theoretical Calculation

In this work, the mass attenuation coefficients, the effective atomic numbers and the effective electron densities of BaO-Na2O-B2O3-SiO2 glass have been studied at 662 keV using WinXCom program. The result show that the mass attenuation coefficients increased with increasing of BaO concentration, reflecting that more photon is attenuated. The effective atomic numbers and the effective electron densities are similar trend with mass attenuation coefficients, reflecting that more virtual electron when higher BaO concentration and more interaction will be occurred in glass matrices.

Hydrothermal of ZnO Nanorod Arrays on ITO Transparent Conductive Oxide Substrate: Effect of Precursor Concentration

In this study, we fabricated the zinc oxide (ZnO) nanorods arrays by hydrothermal technique on indium doped tin oxide (ITO) substrate with different concentration of the precursor with zinc nitrate and hexamethyleneteramine (HMTA) in distilled water. Structure, morphology and optical properties of ZnOnanorods on ITO substrate were characterized by x-ray diffractometer, field-emission scanning electron microscope and spectrophotometer, respectively. The ZnO nanorod arrays showing preferentially oriented in the (001) direction and with a wurtzite structure. The scanning electron microscopy results showed that the hexagonal shape ZnO nanorods. It was found that the diameter, length and density of the ZnO nanorods arrays were strongly influenced by the precursor concentration.