Size distribution of copper nanoclusters in amorphous carbon

Kulikov, D. V.; Trushin, Yu. V.; Kharlamov, V. S.; Ivanov-Omskiĭ, V. I.

doi:10.1134/1.1262421

Cited by 2 publications

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“…The copper clusters are formed due to surface diffusion, as the diffusivity of copper within amorphous carbon is negligible. Therefore, the cluster formation process takes place only during the growth of one or two monolayers [43]. The cluster size distribution function derived from this model represents the experimental data fairly well.…”

Section: Introductionsupporting

confidence: 52%

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Self-Organized Formation of Metal-Carbon Nanostructures by Hyperthermal Ion Deposition

Hannstein¹

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Over the past two decades, there has been a considerable amount of research about the structure and structure formation of metal-containing diamond-like carbon thin films, which is, of course, mainly due to the promising potential in the various fields of application mentioned above. There are a number of methods that are used for the preparation of carbon films containing metal nanoparticles, including pulsed laser deposition [28,29], integrated nanocluster deposition [30], filtered cathodic vacuum arc deposition [31,32], ion beam co-sputtering [33,34,35], and DC [36,37] and RF magnetron sputtering [38,39].The analyses performed on metal-containing amorphous carbon films, of course, depend on the field of application that the researchers are aiming at. A number of the above groups investigate the influence of the metal on the tribological properties of the films [31,32,38], while others focus on the behaviour of the metal within the films, i.e. cluster formation and the corresponding cluster properties in dependence Recently, Corbella and co-workers published a study on the spontaneous forma-

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Section: Introductionsupporting

confidence: 52%

“…Rather extensive studies on amorphous carbon and amorphous hydrogenated carbon films containing either copper, iron, or cobalt were published by Ivanov-Omskiȋ, Yastrebov, and co-workers [36,43,44,45,46]. They used a planar DC magnetron setup for the deposition of a-C:H(Cu) films.…”

Section: Introductionmentioning

confidence: 99%

Self-Organized Formation of Metal-Carbon Nanostructures by Hyperthermal Ion Deposition

Hannstein¹

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“…The mean clusters size was (3 -4) nm for a copper fraction of 5% and increased up to 9 nm at 50% copper ratio. For other systems (a-C:(H,Co), a-C:(H,Cu)), the size distribution of clusters in amorphous hydrogen-containing carbon was investigated by Ivanov-Omski ǐ et al [88][89][90] and Kulikov et al [91]. It was observed that the cluster size in the matrix increases with increasing metal content, which is also the case during annealing of the films.…”

Section: Metal Nano-particles In Amorphous Carbonmentioning

confidence: 99%

Growth and Characterization of Carbon-Metal-Nanocomposite-Thin-Films and Self-Organized Layer Growth

Zutz¹

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The techniques and setups used during this work are presented in Chapter 3. The focus is on the ion beam setups, which were the tools for the preparation of the amorphous carbon samples. The techniques utilized for the analysis of the films are described in Chapter 4.Amorphous carbon films containing metal nano-particles can be prepared by magnetron sputter deposition. With this technique, amorphous carbon with copper or iron clusters has been prepared during former studies [49]. The results are summarized in Section 1.3. Recent studies pick up the results from Gerhards and co-workers, who prepared homogeneous a-C:Cu films by mass-selected ion beam deposition and explore the ion energy E ion and fluence ratio r f space with the aim of creating a multilayered morphology [14,50]. The results are presented briefly in Chapter 5.The carbon-metal nanocomposites were investigated in detail for the a-C:Ni system. The dependence of the film morphology on the deposition parameters 'ion energy E ion ' and 'fluence ratio r f ' is examined and compared to previous studies. These results for a-C:Ni films prepared by two different ion beam setups are discussed in detail in Chapter 6.The metallic clusters in the amorphous carbon or any other matrix can have properties deviating from the bulk material. The properties are determined by the size and shape of these clusters. The optical absorption is, for instance, influenced by non-linear effects in small clusters [51][52][53]. A famous example are the gold nanoparticles in the red windows seen in old churches. The interesting properties of small metal clusters and metal nano-particles in amorphous carbon are described briefly in Sections 1.1 and 1.2.The magnetic properties of small clusters are interesting for the creation of media with a high recording density, since these require high coercive fields. This can be achieved by the introduction of small CoPt or FePt nano-particles in an amorphous carbon matrix [54][55][56][57].In this work the magnetic and magneto-electronic properties of ta-C, doped with Gd via ion implantation were investigated. Gd is found to be always in a trivalent state, with a half-filled f electron shell (J = S = 7/2), which provides a large local moment. Gd-doped a-Si films have shown significant carrier-moment interactions, indicated by their spin-glass ground state, an unsaturated magnetization at high fields and enormous negative magneto resistance (MR) (10 4 at 1 K, in a 60 kOe field) [58,59]. However, all interactions become smaller in Gd-doped a-Ge, which seems to be most likely due to a screening effect [60]. Therefore, one can speculate that the magneto resistance (MR) and characteristic temperature for moment-carrier interactions scales with the band gap. Since the band gap of a-C increases up to 2.5 eV with increasing sp 3 content [61], ta-C could be an ideal matrix. Previous studies show that Gd-doped a-C, which has been prepared via sputtering, is mostly sp 2 -bonded and thus exhibits only a small band gap. Nevertheless, a large negative magnet...

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Size distribution of copper nanoclusters in amorphous carbon

Cited by 2 publications

References 2 publications

Self-Organized Formation of Metal-Carbon Nanostructures by Hyperthermal Ion Deposition

Self-Organized Formation of Metal-Carbon Nanostructures by Hyperthermal Ion Deposition

Growth and Characterization of Carbon-Metal-Nanocomposite-Thin-Films and Self-Organized Layer Growth

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