Showing papers on "Cadmium acetate published in 2000"

F-Doped CdO Thin Films Deposited by Spray Pyrolysis

Abstract: Thin films of CdO were prepared by spray pyrolysis using cadmium acetate as the Cd source. The films were intentionally doped with fluorine by adding NH 4 F in the solution. The substrate temperature was varied in the range from 170 to 290°C while keeping the other deposition parameters constant, except the NH 4 F concentration in the solution, which was varied up to 8 wt%. The structural, optical, and electrical properties of the films were studied in order to obtain, under our experimental conditions, optimal values for the NH 4 F concentration and substrate temperature. We show that the best deposition conditions for a photovoltaic application of the films are substrate temperature T s = 210 °C and NH 4 F concentration around 4%.

Solvothermal synthesis of nanocrystalline cadmium sulfide

Abstract: The synthesis of CdS nanoparticles was widely studied for their potential usage in the field of optics The solvothermal synthesis with ethylene glycol as the solvent was studied in this paper The cadmium acetate and thioacetamide were used as the cadmium source and sulfide source It was observed under TEM that the crystallites are almost spherical The x-ray and electron diffraction results show that the CdS nanocrystallites belong to cubic phase The sizes of the crystallites were determined by XRD and UV absorption to be 4 to 9 nm depending on the amount and molar ratio of the reactants The photoluminescence properties of CdS nanocrystallites in solution and in solid state were investigated

Cadmium mutagenicity and human nucleotide excision repair protein XPA: CD, EXAFS and 1H/15N-NMR spectroscopic studies on the zinc(II)- and cadmium(II)-associated minimal DNA-binding domain (M98–F219)

Abstract: Human XPA is a 31 kDa protein involved in nucleotide excision repair (NER), a ubiquitous, multi-enzyme pathway responsible for processing multiple types of DNA damage in the eukaryotic genome. A zinc-associated, C4-type motif (C105-X(2)-C108-X(17)-C126-X(2)-C129) located in the minimal DNA-binding region (M98-F219) of XPA (XPA-MBD) is essential for damaged DNA recognition. Cadmium is a known carcinogen and can displace the zinc in many metal-binding proteins. It has been suggested that the carcinogenic properties of cadmium may result from structural changes effected in XPA when Cd(2+) is substituted for Zn(2+) in the metal-binding site. The solution structure of XPA-MBD containing zinc(II) has recently been determined [Buchko et al., (1998) Nucleic Acids Res., 26, 2779-2788; Buchko et al., (1999) Biochemistry, 38, 15116-15128]. To assess the effects of cadmium(II) substitution on the structure of XPA-MBD, XPA-MBD was expressed in minimal medium supplemented with cadmium acetate to yield a protein that was almost exclusively (>95%) associated with cadmium(II) (CdXPA-MBD). Extended X-ray absorption fine structure spectra collected on ZnXPA-MBD and CdXPA-MBD in frozen (77 K) 15% aqueous glycerol solution show that the metal is coordinated to the sulfur atoms of four cysteine residues with an average metal-sulfur bond length of 2.34 +/- 0.01 and 2.54 +/- 0.01 A, respectively. Comparison of the circular dichroism, two-dimensional (1)H,(15)N-HSQC, and three-dimensional (15)N-edited HSQC-NOESY spectra of ZnXPA-MBD and CdXPA-MBD show that there are no structural differences between the two proteins. The absence of major structural changes upon substituting cadmium(II) for zinc(II) in XPA suggests that cadmium-induced mutagenesis is probably not due to structural perturbations to the zinc-binding core of XPA.

Synthesis and characterization of cadmium titanium oxide powders by sol-gel technique

Abstract: Uniform crystals of CdTiO3 orthorhombic phase have been preapred by Sol-Gel method using titanium butoxide and cadmium acetate. For the first time the sample has been characterised detailedly to confirm the formation of pure single phase of CdTiO3. It is observed that the sample sintered at 500°C for 5 h showed complete formation of the single phase of CdTiO3 by X-ray diffraction technique. X-ray photoelectron spectroscopy measurement has been carried out for the bulk CdTiO3 sintered at 500 °C for 5 h, which showed 20% of Cd, 20% of Ti and 60% of O indicating stoichiometric CdTiO3. Surface morphology studies by scanning electron microscopy showed uniform crystals of CdTiO3. The purity of the compound has also been checked by Energy Dispersive X-ray method indicating the absence of foreign ions apart from that, the ratio of Cd : Ti has been calculated and found to be 1 : 1 indicating the stoichiometric CdTiO3.

Synthesis of CdTe by Reduction of Metal Alkoxide-Derived CdTeO3

Abstract: A new synthetic route based on solution chemistry was developed for a compound semiconductor cadmium telluride (CdTe) via reduction of CdTeO3 prepared by hydrolysis of the corresponding double metal alkoxide as a starting material. The CdTe double alkoxide solution was prepared by the reaction of cadmium acetate with Te alkoxide in the presence of Na alkoxide in ethanol. Amorphous CdTeO3 was obtained by hydrolysis of the CdTe double alkoxide at room temperature and under the reflux conditions. Heat-treatment of the resulting amorphous CdTeO3 powder at 400°C and 600°C in air resulted in transformation to cubic CdTeO3 and monoclinic CdTeO3, respectively. CdTe was obtained by heat-treatment of calcined amorphous and crystallized CdTeO3 at 200-400°C in H2. The products consisted of the primary particles of about 16nm in diameters and the Cd/Te ratios were chemically stoichiometric. A CdTe film was obtained from screen-printed amorphous CdTeO3 paste on low-cost slide glass substrates by heat-treatment at 400°C in H2.

Preparation of Cadmium Sulfide Nanowire Arrays in Anodic Aluminum Oxide Templates.

Abstract: Nanowire arrays of CdS were fabricated with the method of injecting the solutions of cadmium acetate and thioacetamide into the pores of anodic aluminum oxide by pressure differentiation. The thioa...