The influence of electrodeposition parameters on structure and properties of the multilayer nanocomposites
Adam Tokarz, Andrzej Wolkenberg, Mariusz Kęsik Politechnika Częstochowska, Instytut Inżynierii Materiałowej, al. Armii Krajowej 19, 42-200 Częstochowa
Annals 2 No. 3, 2002 pages 85-90
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abstract The potentiostatic electrochemical method from single electrolyte bath, based on sulphamate (Ni) and sulphate (Co, Cu), has been applied for Cu/Ni and Cu/Co superlattices deposition. Different kinds of methods for the multilayer nanocomposites deposition and its application for different technical fields are presented in Table 1. The experimental setup used for preparation Cu/Ni and Cu/Co systems is presented in Figure 1. The polarisation data for two kinds of the superlattices (Cu/Ni, Cu/Co) are presented in Figure 2. The ranges of the deposition potential where Cu and Ni or Co ions are reduced were established. The correctness of the Cu and Ni deposition potentials for Cu/Ni system was checked by SIMS method (Fig. 3). The chemical composition of the single layers as a function of the deposition potentials was measured by EDX method (Fig. 4a). The correlation of the cathodic current with concentration of the Cu and Co in the single layers deposited at different potentials was investigated (Fig. 4b). Chemical composition of single layers was investigated with SIMS. Both for two systems the Cu layers deposited at chosen potentials were almost pure (99.8% Cu) while Ni (Co) layers contained 2÷5% Cu. The changes of crystallographic orientation (from XRD investigations) as a function of the total thickness of the deposit are shown (Fig. 5). The dependence of the mechanical properties on the total thickness of the deposit is presented in Table 2. In this work the electrochemical parameters of the deposition process are presented. The structural properties of the superlattices depend on the total thickness of the deposit. The changes in the mechanical and magnetoelectrical properties are due to changes in the preferential crystallographic orientations.