Green Preparation of Multiwalled Carbon Nanotubes Supported Pd and Cu Nanoparticles with Novel Vic-dioxime Metal Complexes

Abstract

The preparation of multi-walled carbon nanotubes (MW-CNTs) supported Cu and Pd nanoparticles on utilizing a supercritical carbon dioxide deposition method were investigated. Novel vic-dioxime complexes of Cu(II) and Pd(II) were used as metallic precursors. The ligand used in these precursors were 4-(trifluoromethyl)aniline-vic-dioxide. Ligand and metal complexes were synthesized and identified with various analyses method including 1H and 19F NMR, FT-IR, UV-Vis, elemental analysis and magnetic susceptibility. MW-CNTs supported Pd and Cu nanoparticles were characterized by high-resolution transmission electron microscopy (HR_TEM), X-ray diffraction (XRD) and scanning electron microscopy with EDX (SEM_EDX). SEM_EDX and HR_TEM micrographs showed a homogenous distribution of reasonably well-dispersed Cu and Pd nanoparticles on the support. The nature and crystallinity of the nano metal particles were confirmed using XRD. Crystallite sizes ranged from 7-20 nm for palladium and 20-30 nm for copper. This study demonstrated that these oxime complexes are suitable precursors for the preparation of supported nanoparticles using a supercritical carbon dioxide deposition method.