Preparation of copper and silicon/copper powders by a gas evaporation-condensation method

Abstract

Pure and silicon-coated metal copper nano to submicron-sized powders were prepared by gas evaporation and condensation. This powder was synthesized by using an industrial electron accelerator, ELV-6, with Ar as the carrier gas. Vapour from the liquefied metal surface was transferred to the cold zone by the carrier gas and precipitated as spherical Cu metal and Si/Cu composite powders. The mean diameter of the resulting powder was 100-200 nm.

Synthesis and structure of Ag-Si nanoparticles obtained by the electron-beam evaporation/condensation method

“…Most of these Ag/Si coreshell nanoparticles have dimensions below 10 nm, while a small fraction of such nanoparticles have dimensions up to 70 nm. In comparison to the previ ously reported Cu/SiO 2 core-shell nanoparticles [7], the fraction of Ag/Si core-shell nanoparticles in the obtained powder is lower. The distribution of nanopar ticle sizes is close to lognormal, which indicates that coagulation predominates in the particle formation process.…”

Structure and mechanism of the formation of core–shell nanoparticles obtained through a one-step gas-phase synthesis by electron beam evaporation

“…In the original work [ 7 ], XRD analysis on the bulk Cu@silica samples revealed Cu, Cu 2 O, and CuO phases in the powder. A TEM micrograph of the synthesized Cu@silica nanoparticles is shown in Fig.…”

“…The principle of operation of the experimental setup for producing the Cu@silica and Ag@Si composite nanoparticles and schematics of the device are given in [ 7 – 8 ]. Briefly, an ELV-6 industrial electron accelerator was used to produce an electron beam to evaporate the chosen materials.…”

“…For these established techniques, the mechanisms of formation have been investigated and the various parameters which affect the particle formation are known [ 1 , 6 ]. Recently, the authors have synthesized core–shell Ag–Si and Cu–Si type particles in a new way using electron beam evaporation [ 7 – 8 ]. In this method, the core–shell particles are synthesized in one-step directly from the gas phase without substrates.…”

Effect of Different Parameters on Synthesis of MoO3Nanopowder by the Evaporation–Condensation Technique

“…In this method, most of the product's properties can be controlled relatively easily by either adjusting the process parameters or by adding extra processing steps [3,5]. Nanoparticles of metals, metal-oxides, semiconductors, and hybrid materials have been produced by IGC method [6][7][8][9][10][11][12][13][14]. Kimoto et al in 1963 developed this method for the production of fine metal particles [11].…”