Studies of molybdenum surface modification for growth of adherent CVD diamond film

Abstract

Surfaces with very poor mechanical and frictional properties can be improved, or even, acquire new properties similar to diamond if good adherent CVD diamond film is obtained on it. In this work, nitrogen ions were sub-implanted on pure molybdenum as a means to enhance CVD diamond film adherence. Deposition time from 2 up to 60 h were used for deposition of 10 to 400 µm thick CVD diamond films with very good adherence on sub-implanted molybdenum substrate. Characterizations were carried out by XPS, X-ray diffraction and nano indentation on prepared surfaces prior to diamond growth and after the onset nucleation. The ionic sub-implantation with nitrogen possibly assists in adhesion, with the creation of a thin layer of nitrates and complexes

Taxa de crescimento de filmes de diamante CVD em superfícies de molibdênio

“…Quando o diamante natural é utilizado como substrato, a estrutura sp³ já está formada e os átomos de carbono são acrescidos a essa estrutura pronta, repetindo-a. Quando o substrato é composto de outro material que não o diamante, são empregadas algumas técni-cas para favorecer a nucleação [10] e diminuir o intervalo de tempo para que a reação se inicie.…”