Characterization of metal oxide layers grown on CVD graphene

Matsubayashi, Akitomo; Abel, Joseph; Sinha, Durganand; Lee, Ji Ung; LaBella, V. P.

doi:10.1116/1.4792068

Cited by 9 publications

(6 citation statements)

References 28 publications

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“…For this reason, a thin metal seed layer was evaporated on graphene. Titanium was chosen as the seed layer due to its high adsorption energy on graphene 27 and low surface diffusion 28 . The 2 nm film of titanium was oxidized once exposed to air, resulting in a thin layer of TiO 2 on the graphene surface.…”

Section: Resultsmentioning

confidence: 99%

Electron beam induced local crystallization of HfO2 nanopores for biosensing applications

2013

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We report the development of single, locally crystallized nanopores in HfO2 membranes for biosensing applications. HfO2 is chosen for its isoelectric point of 7.0, mechanical and chemical stability in solution, and for its potential as a high-k material for nanopore ionic field effect transistor applications. The HfO2 membrane is deposited on a graphene layer suspended over a 300 nm FIB hole, where graphene is used as the mechanical support. Exposure of the membrane to a focused electron beam causes crystallization in the vicinity of the nanopore during pore formation. We investigate the effects of crystallization on the electrical and surface properties of HfO2 films. Our surface analysis of HfO2 reveals improved hydrophilicity of crystallized HfO2, a notable advantage over the hydrophobicity of as-deposited HfO2. We also demonstrate detection of dsDNA translocation through HfO2 nanopores under various applied bias levels. In addition, our device architecture also presents a promising first step toward the realization of high-k HfO2 nanopore transistors.

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Section: Resultsmentioning

confidence: 99%

Electron beam induced local crystallization of HfO2 nanopores for biosensing applications

2013

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“…In the scope of previous studies on the chlorination and fluorination of graphene, , our work suggests that p–d hybridization from metal adsorbents could also serve as a valid possibility. In addition, by combining lithography techniques, this new metal-functionalization of graphene and the crystallinity of the titanium surface structure may even serve as a patterned growth template for the preparation of future nanomaterials …”

Section: Discussionmentioning

confidence: 99%

Surface-Induced Hybridization between Graphene and Titanium

et al. 2014

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Carbon-based materials such as graphene sheets and carbon nanotubes have inspired a broad range of applications ranging from high-speed flexible electronics all the way to ultrastrong membranes. However, many of these applications are limited by the complex interactions between carbon-based materials and metals. In this work, we experimentally investigate the structural interactions between graphene and transition metals such as palladium (Pd) and titanium (Ti), which have been confirmed by density functional simulations. We find that the adsorption of titanium on graphene is more energetically favorable than in the case of most metals, and density functional theory shows that a surface induced p-d hybridization occurs between atomic carbon and titanium orbitals. This strong affinity between the two materials results in a short-range ordered crystalline deposition on top of graphene as well as chemical modifications to graphene as seen by Raman and X-ray photoemission spectroscopy (XPS). This induced hybridization is interface-specific and has major consequences for contacting graphene-nanoelectronic devices as well as applications toward metal-induced chemical functionalization of graphene.

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“…[19][20][21] We recently demonstrated that yttria monolayers wet graphene 22 and thus yttria may be an ideal dielectric for graphene devices. This is in agreement with previous use of yttria for graphene or carbon nanotube device structures.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Ni(111)/graphene/Y2O3(111) heterostructures

Dahal

Coy-Diaz

Addou

et al. 2013

Journal of Applied Physics

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Integration of graphene with other materials by direct growth, i.e., not using mechanical transfer procedures, is investigated on the example of metal/graphene/dielectric heterostructures. Such structures may become useful in spintronics applications using graphene as a spin-filter. Here, we systematically discuss the optimization of synthesis procedures for every layer of the heterostructure and characterize the material by imaging and diffraction methods. 300 nm thick contiguous (111) Ni-films are grown by physical vapor deposition on YSZ(111) or Al2O3(0001) substrates. Subsequently, chemical vapor deposition growth of graphene in ultra-high vacuum (UHV) is compared to tube-furnace synthesis. Only under UHV conditions, monolayer graphene in registry with Ni(111) has been obtained. In the tube furnace, mono- and bilayer graphene is obtained at growth temperatures of ∼800 °C, while at 900 °C, non-uniform thick graphene multilayers are formed. Y2O3 films grown by reactive molecular beam epitaxy in UHV covers the graphene/Ni(111) surface uniformly. Annealing to 500 °C results in crystallization of the yttria with a (111) surface orientation.

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Characterization of metal oxide layers grown on CVD graphene

Cited by 9 publications

References 28 publications

Electron beam induced local crystallization of HfO2 nanopores for biosensing applications

Electron beam induced local crystallization of HfO2 nanopores for biosensing applications

Surface-Induced Hybridization between Graphene and Titanium

Preparation and characterization of Ni(111)/graphene/Y2O3(111) heterostructures

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