Co cluster coalescence behavior observed by electrical conduction and transmission electron microscopy

Peng, Dong‐Liang; Konno, Toshio; Wakoh, Kimio; Hihara, Takehiko; Sumiyama, K.

doi:10.1063/1.1354158

Cited by 20 publications

(18 citation statements)

References 17 publications

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“…Moreover, we are able to reproduce experimental results 4,5,6 for the diffusion and agglomeration of size selected clusters published previously.…”

Section: Island Formationsupporting

confidence: 69%

“…While the formation of small islands on short time scales has been observed previously for larger sizeselected clusters for Co on microgrid substrates, 4 for Au on amorphous carbon, 5 as well as for Ag on graphite, 6 the new features here are dark areas typically covering 25×70 nm 2 underlying the larger clusters. As described in this paper in detail we were able to identify these areas as islands consisting of Au films of roughly 4 to 8 monolayers thickness with immersed larger Au clusters.…”

Section: Introductionmentioning

confidence: 87%

“…In conclusion the cluster diffusion and fusion as modeled by the effective clusters and cluster interactions correctly accounts for the experimentally observed 4,5,6 pattern formation [ Fig. 12(a)].…”

mentioning

confidence: 82%

“…Panel (a) shows that after 3000 MC steps per cluster small islands and chains of clusters have formed very similar to those observed on short time scales for monodisperse 4.8 nm diameter Au clusters on an a-C substrate, 5 Ag 5000 clusters on graphite, 6 and 8.5 nm diameter Co clusters on microgrid substrates. 4 It is important to note that the time scales for the diffusion and fusion processes depend on the temperature, the substrate properties, and the cluster sizes so that these metastable structures can be observed only in a system specific time window.…”

Section: Island Formationmentioning

confidence: 99%

“…Larger clusters fuse on much longer time scales or at higher temperatures. 4,5,6,60,61 From the MC simulations a diffusion coefficient cannot be determined quantitatively because of the lack of a time constant in the MC procedure. Panels (b), (c) and (d) of Fig.…”

mentioning

confidence: 99%

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Island formation and dynamics of gold clusters on amorphous carbon films

et al. 2005

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Samples of Au clusters deposited by laser ablation on an amorphous-carbon substrate are investigated. After a few months storage at room temperature the initially statistically distributed clusters are found to be collected in agglomerates consisting of larger clusters embedded in an Au film typically covering areas of size 25×70 nm 2 . The Au film is determined to be probably 4 to 8 monolayers but at most 7 nm thick. Evidence is found that a number of clusters consisting of less then 50 atoms are pinned at intrusions of the substrate. These results were derived using high resolution transmission electron microscopy and off-axis holography measurements to characterize the agglomerates as well as the substrate. Monte-Carlo simulations were performed to model the film formation process. To this end the substrate-Au interaction was determined using density functional calculations (GGA) while the Au-Au interaction was modeled with effective many body Gupta potentials. The film formation can be understood as diffusion and fusion of clusters of intermediate (50 < N < 300 atoms) size. Larger clusters are more stable at room temperature and remain adsorbed on the Au film.

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“…Moreover, we are able to reproduce experimental results 4,5,6 for the diffusion and agglomeration of size selected clusters published previously.…”

Section: Island Formationsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 87%

mentioning

confidence: 82%

Section: Island Formationmentioning

confidence: 99%

mentioning

confidence: 99%

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Island formation and dynamics of gold clusters on amorphous carbon films

et al. 2005

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Electrical Transport Mechanisms in Ensembles of Silicon Nanocystallites

Balberg

2010

Silicon Nanocrystals

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While the optical [1][2][3] properties of various ensembles of individual Si nanocrystallites (NCs) and the memory-charge storage (CS) characteristics of two-dimensional (2D) arrays of Si NCs [4] have been investigated by many researchers, relatively little attention was paid to the transport properties of 3D ensembles of such quantum dots (QDs) [5]. The interest in the last systems, however, is expected to follow the new basic physics that it reveals and the potential applications of such systems. Following the reasonable (though still controversial [6]) understanding of granular metals [7,8], where the electrical conduction takes place via metallic particles, additional significant insights into the transport mechanism [5,9] and new phenomena are expected in Si NCs due to the presence of confined levels [10]. In particular, the combination of Coulomb blockade (CB) effects and the quantum confinement (QC) restrictions can yield various resonant tunneling effects [11] as well as various quantum phase transformations [12] that are beyond the scope of this chapter. From the application point of view, one realizes that significant electroluminescence (EL) can come about only as a result of efficient transport in 3D ensembles of Si NCs [4,13,14] that are dense enough to yield strong light emission. Finding the conditions for the optimization of the luminescence and the transport is then the route to achieve efficient Si-based photoelectronic devices [15].In this chapter, we present a review on the electrical transport in the ensembles of Si NCs. Since we are concerned with the transport in 3D ensembles of quantum dots, we will only briefly review the main results obtained from lower dimensional ensembles (i.e., 1D-like [16, 17] or perpendicular to 2D arrays [18][19][20][21]) of Si QDs in order to provide a reference for the effects of the small size of the single Si NCs on the transport in ensembles of larger dimensions. We will see that in spite of many studies of these 0D-like and 2D systems, which are essentially associated with single isolated NCs, and their potential use as nonvolatile memories, only the basics of the Silicon Nanocrystals: Fundamentals, Synthesis and Applications. Edited by Lorenzo Pavesi and Rasit Turan

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Percolation Theory and Its Application in Electrically Conducting Materials

Balberg

2012

Semiconducting Polymer Composites

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Co cluster coalescence behavior observed by electrical conduction and transmission electron microscopy

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Cited by 20 publications

References 17 publications

Island formation and dynamics of gold clusters on amorphous carbon films

Island formation and dynamics of gold clusters on amorphous carbon films

Electrical Transport Mechanisms in Ensembles of Silicon Nanocystallites

Percolation Theory and Its Application in Electrically Conducting Materials

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