High density flux of Co nanoparticles produced by a simple gas aggregation apparatus

Abstract

Gas aggregation is a well known method used to produce clusters of different materials with good size control, reduced dispersion, and precise stoichiometry. The cost of these systems is relatively high and they are generally dedicated apparatuses. Furthermore, the usual sample production speed of these systems is not as fast as physical vapor deposition devices posing a problem when thick samples are needed. In this paper we describe the development of a multipurpose gas aggregation system constructed as an adaptation to a magnetron sputtering system. The cost of this adaptation is negligible and its installation and operation are both remarkably simple. The gas flow for flux in the range of 60-130 SCCM ͑SCCM denotes cubic centimeter per minute at STP͒ is able to completely collimate all the sputtered material, producing spherical nanoparticles. Co nanoparticles were produced and characterized using electron microscopy techniques and Rutherford back-scattering analysis. The size of the particles is around 10 nm with around 75 nm/min of deposition rate at the center of a Gaussian profile nanoparticle beam.

Formation of gold nanoparticles and their aggregates in a liquid at magnetron deposition

“…To make estimates, we will use the effective atomic radius (3) where v at is the atomic volume per atom in the solid phase, and put g = 1, since atoms are much smaller than PPMS molecules. With regard to the boundary condition (4) where J is the density of the atomic flux incident on the liquid surface, Eq.…”

“…The method of inert gas condensation (IGC method) is well known and is finding wide application in dispersed nanopowder technology [1][2][3][4][5]. At a low pressure of buffer gas, intense atomic fluxes are, as a rule, provided by magnetron or vacuum arc sputtering.…”

Extended-area deposition of homogeneously sized nanoparticles using modified inert gas condensation technique

“…Various vapor phase techniques are known for synthesis and deposition of NPs [4], including Inert Gas Condensation (IGC). In IGC, NPs are generated from a solid source [5][6][7][8][9][10][11][12]. The atoms, ions and molecules generated from this solid source condense by collision with an inert gas to form NPs.…”

Desenvolvimento da metodologia física de produção de nanopartículas do tipo núcleo@casca

“…O sistema usado neste trabalho está relacionado com a técnica de condensação de vapor atômico [6], onde um gerador de nanopartículas foi acoplado em um dos canhões do sistema de magnetron sputtering [7]. De forma resumida, o gerador de nanopartículas é como uma câmara (normalmente denominada de "copo" devido a sua forma geométrica) preenchida com uma atmosfera de argônio em alta pressão relativa.…”