Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : CdO

Investigation of pyrolysis method for preparing CdO:In2O3 thin films gas sensor for NO2 gas

Shatha Shammon Batros

Engineering and Technology Journal, 2015, Volume 33, Issue 6, Pages 1134-1144

A novel CdO:In2O3nano composite has been synthesized by a pyrolysis method. The prepared nano composites have been carefully characterized using X ray diffraction and atomic force microscopy. The obtained results showed that the synthesized nano compositeCdo:In2O3 at optimum conditions has excellent grains. It was found that synthesized CdO:In2O¬3nano composite can be used as NO2 gas sensing to exhibit the highest sensitivity for NO2 at 200°C. The constructed sensor showed a very low detection limit of 5 ppm .

Structural and Optical properties of CdO doped TiO2 thin films prepared by Pulsed Laser Deposition

Ghusson H. Mohammed; Ahmed M. Savore; Mohammed Hadi. Shinen; Kadhim A. Adem

Engineering and Technology Journal, 2015, Volume 33, Issue 5, Pages 918-931

TiO2 thin films have been deposited at room temperature with different concentration of CdO of x= (0.0, 0.05, 0.1, 0.15and 0.2) wt. % onto glass substrates by pulsed laser deposition (PLD) technique using Nd-YAG laser with λ=1064nm, energy=800mJ and number of shots=500. The structural, morphological and optical characterizations of as- deposited films were carried out using X-ray diffraction (XRD), atomic force microscopy (AFM), and UV–vis transmittance spectroscopy. The Effect of CdO content on these properties was investigated. Characterizations by X-ray diffraction show a polycrystalline film, with tetragonal structure and formation of Rutile phase and many peaks (110), (101), (111) and (211) were appear. In addition, AFM investigation shows no cracks in the formed layer. The optical properties concerning the absorption and transmission spectra were studied for the prepared thin films using an ultraviolet–visible near-infrared spectrophotometer. The results show that the transmittance of the TiO2 film in the visible domain reaches 75%.Optical band gaps were calculated and found to be (3.62, 3.54, 3.45, 3.3 and 3.21) eV for the concentration of CdO x= (0.0, 0.05, 0.1, 0.15 and 0.2) wt. % respectively. At 350 nm the refractive index,extinction coefficient and dielectric constant were determined.

Growth Kinetics of Chemically Deposited CdO Thin Films

Hadia Kadhim J.Alogili; Selma Mohammed H. Al-Jawad

Engineering and Technology Journal, 2009, Volume 27, Issue 11, Pages 2335-2344

In this work CdO films were prepared by using chemical bath deposition
technique where the cadmium nitrate salt was used as a source of cadmium ions.
The effect of different bath parameters has been considered in this work, namely,
cadmium ion concentration, deposition time, temperature of solution and pH value,
on the rate of deposition and terminal thickness. Annealing process in air at
temperature 573K° and time of 15min. are carried out for the conversion of
cadmium hydroxide film to oxide film. X-Ray diffraction technique has confirmed
the formation of cadmium oxide (CdO).