Cadmium optical properties

Popescu, V. Pica, E. M. Pop, I. Grecu, R. 1999. Optical properties of cadmium sulfide thin films, chemically deposited from baths containing surfactants. Thin... 

Second order non-linear optical properties have been reported for a variety of TTF donor-acceptor compounds <02T7463> and the palladium complex 84 is a room-temperature semiconductor <02CL936>. Preparation of the zinc and cadmium compounds 85 has been reported <02CC1474> and aromatic fused TTFs such as 86 form thin films with useful electrical properties <02JAP265466>. A ferromagnetic interaction occurs in the salt of a TTF... 

Semiconductor nanoparticles have been extensively studied in recent years owing to their strongly size-dependent optical properties. Among these nanomaterials, CdS and PbS are particularly attractive due to their nonlinear optical behavior and unusual fluorescence or photoluminescence properties [ 136,137]. A number of studies have been published recently regarding the preparation of CdS, PbS and ZnS nanoparticles in inverse microemulsion systems [138-143]. In these works, NP-5/NP-9 was the most commonly used surfactant and petroleum ether the most commonly used oil. The aqueous phase for each inverse microemulsion consisted of cadmium nitrate (0.1 M) and ammonia sulfide (0.1 M) respectively. CdS was recovered from the mixture of double microemulsions [141]. Electron microscopy revealed that the spherical particles were aroimd 10-20 nm in diameter, as seen in Fig. 14. 

OPTICAL PROPERTIES OF SPUTTERED ZINC AND CADMIUM CHALCOGENIDE FILMS... 

Both cadmium and cobalt enzymes modulate in a distinctive fashion, the optical properties of asymmetrically bound extrinsic chromophores such as the coenzyme, DPNH, and the chelating inhibitor, 1,10-phenan-throline, providing a useful means to study the interaction of these molecules with LADH (22). 

White et al. [45] reported in 1985 on experiments involving the same two sulfide semiconductors, CdS and ZnS. Although the focus of this work was on the photocatalytic hydrogen evolution as a function of shape and composition rather than on the optical properties of the particles, it should be mentioned here since it contains the first x-ray photoelectron spectroscopy (XPS) measurements on spherically layered semiconductor particles. By successive precipitation of cadmium and zinc salts with H2S onto Si02 supports, both composites have been prepared, ZnS on a CdS core and CdS on a ZnS core. The surface composition was analyzed by XPS taking the Cd(3d)/Zn(2p) peak area ratio as the measure of the surface atomic ratio in the composite particles. The results are such that, indeed, spherically layered particles are formed in the preparative procedure. 

Platinates, bis(oxalato)-, 139 cadmium complexes superstructure, 142 cobalt complexes, 140 electrical conductivity, 14] superstructure, 141 thermopower, 141 divalent cation salts, 140 iron complexes structure, 142 lead complexes superstructure, 142 magnesium complexes, 140 electrical conduction, 142 structure, 142 thermopower, 142 modulated superstructure, 139 monovalent cation salts, 139 nickel complexes structure, 141 partially oxidized, 139 Platinates, tetracyano-, 136 anion-deficient salts, 136 electrical conduction, 138 optical properties, 138 cation-deficient salts, 138 oxidation states, 136 partially oxidized, 138 semiconductors, 134 Platinum colloidal... 

The values of the bond ionicily can be used to predict the forbidden band width of zinc and cadmium diphosphides this width should be 1.5-2 eV. This prediction is supported by the recent [19, 20] measurements of the optical properties of these compounds which yield the optical width of the forbidden band AE = 2 eV for ZnP2 [19] and CdP2 [20]. 

More recently, the dangerous organometallic precursors (especially dimethylcad-mium) have been replaced by les s dangerous cadmium compounds, such as CdO [99] or Cd-acetate [260], both of which can be dissolved inTOPO or ODE in the presence of carboxylic or phosphonic acids. This makes the high-temperature synthesis of nanocrystals in organic solvents much easier (and therefore accessible), without losing any of the excellent optical properties of the particles. 

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