Physical Properties of Nanostructured CdO Films from Alkaline Baths Containing Saccharin as Additive
Nanostructured cadmium oxide (CdO) films were fabricated on glass substrates from alkaline baths containing saccharin as an additive by a successive ionic layer adsorption and reaction (SILAR) method. The effects of saccharin concentration in the bath on the structural, morphological, and optical properties were studied by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence, and Raman spectroscopy. The analyses showed that the surface morphologies, XRD peak intensities, Raman spectroscopy, and photoluminescence properties of CdO films changed with saccharin concentration. From the results, it can be said that morphological characteristic and optical properties of the films could be calibrated by adding various saccharin percentages in the growth bath.
Synthesis, characterization and gas-sensing properties of SILAR deposited ZnO-CdO nano-composite thin film
Abstract The deposition of ZnO-CdO thin films are carried out using successive ionic layer adsorption and reaction (SILAR) method at room temperature. The deposited ZnO-CdO thin films have been characterized using FT-Raman spectroscopy, scanning electron microscopy, UV-vis spectrophotometer, two point probe resistivity method, and contact angle mode. Raman spectroscopy show various peaks from the as deposited films which disappeared after annealing. The SEM reveals the morphology of the films nanosized smooth interlocked sheets all over the surface. The bandgap value of 3.8 eV is observed for as deposited but decreased to 2.9 eV after annealing. Activation energies of 0.43 and 0.11 eV are estimated for the as deposited film and annealed film, respectively. The Gas response of the ZnO-CdO composite film shows maximum (about 50%) at 623 K upon exposure to 780 ppm of LPG.
Compressive and flexural properties of hemp fiber reinforced concrete
The compressive and flexural properties of hemp fiber reinforced concretes (FRC) were examined in this paper. Natural hemp fiber was mixed using dry and wet mixing methods to fabricate the FRC. Mechanical properties of the FRC were investigated. The main factors affecting compressive and flexural properties of the FRC materials were evaluated with an orthogonal test design. Fiber content by weight has the largest effect. The method for casting hemp FRC has been optimised. Under the optimum conditions, compressive strength increased by 4 %, flexural strength increased by 9 %, flexural toughness increased by 144 %, and flexural toughness index increased by 214 %.