DLC with silver nanoparticles study for space and biomedical applications / Estudo de crescimentos de filmes de DLC com nanopartículas de prata para aplicações espaciais e biomédicas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Diamond-like carbon (DLC) is a metastable form of amorphous carbon with high mechanical hardness, chemical inertness, optical transparency, low friction coefficient and its wear resistant. Since centuries, silver is known as bactericidal agent and, as a soft metal, its also used as a solid lubricant. This project develops a deposition process to insert silver nanoparticles in DLC bulk. The goal is to reduce DLC etching against atomic oxygen and to create a biocompatible coating with bactericidal properties. DLC films were deposited over silicon and stainless steel substrates by PEVCD (Plasma Enhanced Chemical Vapor Deposition) technique. Silver nanoparticles were obtained through a controlled electrochemical process. They were incorporated in DLC bulk in three different conditions: using methane as a feed gas, DLC was deposited with silver solution being sprayed over the films (a) into and (b) outer the deposition chamber and (c) from a mixture of methane and hexane (silver was transferred to hexane in different concentrations). Etching tests show the efficiency of silver incorporation against oxygen etching. Bactericidal tests show the efficiency of the films with silver against E. coli and 30% bactericidal efficiency of pure DLC against the same bacteria.

ASSUNTO(S)

ação bactericida corrosão por plasma de oxigênio computer science engenharia e tecnologia espacial silver nanoparticles reactive ion etching nano partículas de prata diamond-like carbon films filmes de carbono tipo diamante bactericidal activity

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