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GROWTH AND CHARACTERISATION OF ZINC-CADMIUM SULPHIDE THIN FILMS … Figure 4. Specular reflectance spectra of ZnCdS thin films obtained from chemical bath with different Cd 2+ amounts Morphology of ZnCdS films was investigated by scanning electronic microscopy (Fig. 5). SEM images put in evidence that the surface of films deposited from bath with different Cd 2+ amounts, is variable. The most structured/particulate film is obtained from bath containing only cadmium acetate. Figure 5. SEM images of ZnS film (H2.3) and CdS film (H 1.4) 207
208 MARIA ŞTEFAN, IOAN BÂLDEA, RODICA GRECU ET ALL EDX investigations proved that film composition is different of that one of the chemical bath, as already suggested by the UV-Vis spectroscopic investigations (Table 1). For instance, the composition of film H7.2 obtained from bath with 40 mol% Cd 2+ contains about 75 mol% Cd 2+ . One notes also that the ZnCdS are usually thinner than the pure ZnS or CdS films). As expected, the preferential precipitation of cadmium sulfide is observed and Cd-rich ZnCdS films are usually growth in our CBD conditions. One can also note that, according to the EDX data, the heterostructure contains Zn, Cd and S from the chalcogenide films and Si, O, Ca, Na, Mg and Al from the glass substrate (the electron beam penetrates the thin ZnCdS film and enters into the glass substrate, see table 1). Table 1. Composition of the ZnCdS/glass/ZnCdS films heterostructures obtained from chemical bath with different compositions (where others = Na, Mg, Al, K, Ca, O) Code Zn/Cd in bath Heterostructure composition (mol %) Si Others Zn Cd S Zn/Cd in film Packing density (mg/cm 2 ) H2.1 1:0 10.70 72.51 11.25 0 5.54 1:0 0.26 H3.2 1:0.25 62.89 29.79 1.23 1.56 4.53 1:1.27 0.13 H7.2 1:0.66 29.89 67.03 0.29 1.05 1.74 1:3.62 0.12 H9.2 1:4.00 29.76 62.54 0.19 3.27 4.24 1:17.21 0.25 H1.5 0:1 29.65 56.00 0 6.53 7.82 0:1 0.30 The crystalline structure of ZnCdS thin films has been investigated by the X-ray diffraction technique (Fig. 6). All films deposited on glass substrate are amorphous, as illustrated by the X-ray scattering curves; an organization tendency of CdS containing layers in comparison with ZnS films can be observed. Figure 6. X-ray scattering curves of some ZnCdS films (MoKα)
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R /(mol m -2 s -1 ) 0.06 0.05 0.04
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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Studia Universitatis Babes-Bolyai C
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6 PROFESSOR IOAN BÂLDEA AT HIS 70
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MARCELA ACHIM, DANA MUNTEAN, LAURIA
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STUDIA UNIVERSITATIS BABEŞ-BOLYAI,
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STUDIES ON WO3 THIN FILMS PREPARED
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PREPARATION AND CHARACTERIZATION OF
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32 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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34 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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C. CĂŢĂNAŞ, M. MOGOŞ, D. HORVA
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38 ANA-MARIA CORMOS, JOZSEF GASPAR,
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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50 EUGEN DARVASI, LADISLAU KÉKEDY-
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MATHEMATICAL MODELING FOR THE CRYST
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STUDY OF THE CHROMATOGRAPHIC RETENT
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LOWER RIM SILYL SUBSTITUTED CALIX[8
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THE INTERACTION OF SILVER NANOPARTI
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OPTIMISATION OF COPPER REMOVAL FROM
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MELINDA-HAYDEE KOVACS, DUMITRU RIST
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IRON DOPED CARBON AEROGEL AS CATALY
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128 ANDRADA MĂICĂNEANU, HOREA BED
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ANDRADA MĂICĂNEANU, HOREA BEDELEA
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CRISTINA MIHALI, GABRIELA OPREA, EL
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144 CRISTINA MIHALI, GABRIELA OPREA
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146 Interfering ion, J - I - DBS -
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CONCLUSIONS 148 CRISTINA MIHALI, GA
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150 CRISTINA MIHALI, GABRIELA OPREA
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152 D. MIHU, L. VLASE, S. IMRE, C.
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Page 207 and 208: EQUILIBRIUM STUDY ON ADSORPTION PRO
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260 CODRUTA VARODI, DELIA GLIGOR, L
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262 CODRUTA VARODI, DELIA GLIGOR, L
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PHARMACOKINETIC INTERACTION BETWEEN
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