Growth of Y-Shaped Nanorods through Physical Vapor Deposition

Wang, Jian; Huang, Hanchen; Kesapragada, S. V.; Gall, Daniel

doi:10.1021/nl0518425

Cited by 157 publications

(140 citation statements)

References 24 publications

(50 reference statements)

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“…Before closing, it is interesting to note that, here we have demonstrated a growth picture that is opposite to the conventional multilayer growth, 44,[49][50][51] where larger additional diffusion barriers at the step edge (ES barrier 21,22 ) lead to higher nucleation probabilities of the second-layer islands. In contrast, here the higher the V ES , the lower the growth rate of the second layer underneath.…”

Section: Discussionmentioning

confidence: 68%

Atomistic mechanisms for bilayer growth of graphene on metal substrates

et al. 2015

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Epitaxial growth on metal substrates has been shown to be the most powerful approach in producing large-scale high-quality monolayer graphene, yet it remains a major challenge to realize uniform bilayer graphene growth. Here we carry out a comparative study of the atomistic mechanisms for bilayer graphene growth on the (111) surfaces of Cu and Ni, using multi-scale approaches combining first-principles calculations and rate equation analysis. We first show that the relatively weak graphene-Cu interaction enhances the lateral diffusion and effective nucleation of C atoms underneath the graphene island, thereby making it more feasible to grow bilayer graphene on Cu. In contrast, the stronger graphene-Ni interaction suppresses the lateral mobility and dimerization of C atoms underneath the graphene, making it unlikely to achieve controlled growth of bilayer graphene on Ni. We then determine the critical graphene size beyond which nucleation of the second layer will take place. Intriguingly, the critical size exhibits an effective inverse "Ehrlich-Schwoebel barrier" effect, becoming smaller for faster C migration from the Cu surface to the graphene-Cu interface sites across the graphene edge. These findings allow us to propose a novel alternating growth scheme to realize mass production of bilayer graphene.

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Section: Discussionmentioning

confidence: 68%

Atomistic mechanisms for bilayer growth of graphene on metal substrates

et al. 2015

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“…Therefore, the advantage to understand the correlation between the type of the metal used and the final properties would result in the production of carbon-based materials with tailored properties. Also, the development of a suitable method to separate metallic and semiconducting CNTs and reduction of catalyst impurities are other challenges [92]. Recent studies on synthesis of CNTs without metal support and oxygen assisted is breakthrough; future studies should focus on scaling-up this method resulting in the production of CNTs with dramatically reduced impurities [93,94].…”

Section: Carbon Nanotube and Carbon Nanofibresmentioning

confidence: 99%

Manufacturing nanomaterials: from research to industry

et al. 2014

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-Manufacturing of nanomaterials is an interdisciplinary field covering physics, chemistry, biology, materials science and engineering. The interaction between scientists with different disciplines will undoubtedly lead to the production of novel materials with tailored properties. The success of nanomanufacturing depends on the strong cooperation between academia and industry in order to be informed about current needs and future challenges, to design products directly transferred into the industrial sector. It is of paramount importance the selection of the appropriate method combining synthesis of nanomaterials with required properties and limited impurities as well as scalability of the technique. Their industrial use faces many obstacles as there is no suitable regulatory framework and guidance on safety requirements; specific provisions have yet to be established in EU legislation. Moreover, regulations related to the right of intellectual properties as well as the absence of an appropriate framework for patent registration are issues delaying the process of products' industrial application. The utilization of high-quality nanomaterials is now growing and coming to the industrial arena rendering them as the next generation attractive resources with promising applications. Undoubtedly, the existing gap between basic research relating nanomaterials and their application in real life will be overcome in the coming decade.

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“…3 For example, fi ne twin domains with an average thickness of ∼ 3.8 nm have been observed in cubic boron nitride ( c BN), and the resulting nanotwinned (NT) c BN bulk samples have an extremely high Vickers hardness; in the case of NT c BN, the hardness exceeds 100 GPa-the optimal hardness of synthetic diamond. 4 Because of the mirror symmetry associated with twinning, the formation of twin boundaries has been used to tailor the morphologies of crystalline nanowires and nanorods, such as zigzag SiC nanorods and nanowires, 5 Y-shape branched nanorods, 6 and kinked Ge-Si semiconductor nanowires. 7 This issue of MRS Bulletin includes six articles that highlight current active research on twins and twinning in metals, including the synthesis and mechanical behavior of NT metallic materials, plasticity induced by mechanical twinning in hexagonal-close-packed (hcp) metals, and twinninginduced plasticity in steels.…”

Section: Introductionmentioning

confidence: 99%