Size and distribution of palladium nanoparticles electrodeposited on graphite

Morphology and particle size distribution of palladium nanoparticles obtained by pulse electrodeposition on graphite surfaces in dimethylformamide solution containing 0.01 M PdCl2 were examined by field emission scanning electron microscopy. Chemical composition of the deposits was determined by energy dispersive X-ray spectroscopy. It was found that the average size of palladium nanoparticles increased while their density decreased with the number of pulse cycles

Electrochemical properties of the composites synthesized from polyaniline and modified MWCNT

Electroactive composites made of polyaniline and MWCNT modified by aminobenzene groups were electrochemically synthesized. SEM observation confirms that the composites become more porous as the MWCNT aggregation on the electrode surface gradually increases. Paraboloid dependence of specific electrical conductivity on theMWCNT content was found for the composites with more than 2.0 wt% of MWCNT. Obtained results confirmed a strong relationship between the surface and electrical properties allowing to offer their optimization using different amount ofMWCNTs and preparation procedure

Nucleation and growth of Au and Au-Pd nanoparticles at the beginning of electrochemical deposition

Gold and gold-palladium nanodeposits were obtained by pulse electrolysis in dimethylformamide with 4 x 10(-3) M HAuCl4 and in dimethyl sulfoxide solution with a mixture of 4 x 10(-3) M HAuCl4 and 4 x 10(-3) M PdCl2, respectively. Isolated gold nanoparticles of about 15 nm in diameter were found by SEM observation after 6 ms of electrochemical deposition. Three pulse and pause periods with duration of 6 ms and 300 ms respectively led to an increase in the particle size approximately two times. In case of gold-palladium deposition, no particles were detected after 10 electrochemical cycles while after 50 cycles 10-35 nm nanoparticles were found. Detailed SEM analysis of electrode surface suggested that at the beginning of electrochemical deposition the growth of gold/nucleation of gold-palladium NPs is a preference for mono-Au/bimetallic Au-Pd system