Self-assembled metallic nanoparticle superlattices on large-area graphene thin films: growth and evanescent waveguiding properties

Ouyang, Tianhao; Akbari-Sharbaf, Arash; Park, Jae-Woo; Bauld, Reg; Cottam, M. G.; Fanchini, Giovanni

doi:10.1039/c5ra22052a

Cited by 6 publications

(9 citation statements)

References 33 publications

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“…After 8 h annealing at this temperature, Cu-NPs align in parallel lines along the armchair direction of the graphene lattice. The inter-particle spacing in this case is relatively low with a ∼12 nm inter-particle spacing along the same line, while the spacing between lines is found to be one order of magnitude higher (∼182 nm) [6]. The use of higher annealing temperatures' (Figure 6, right panel c) kinetic effects cause the Cu-NPs to become displaced from the superlattice structure observed at 360°C.…”

Section: Specific Properties and Applications Of Graphene Thin Films mentioning

confidence: 67%

“…Doping effects from metal nanoparticles may be used to shift the graphene work function for solar cell applications or light-emitting diode (LED) applications. Organized nanostructures such as self-assembled ordered superlattices of metal nanoparticles can be used as plasmonic waveguides [5,6]. The electronic band structure of graphene can be altered by applying metallic layers on its surface, where this effect is strongly dependent on the specific type of metal being used.…”

Section: Introductionmentioning

confidence: 99%

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Graphene Thin Films and Graphene Decorated with Metal Nanoparticles

Bazylewski¹,

Akbari-Sharbaf²,

Ezugwu³

et al. 2016

Crystalline and Non-Crystalline Solids

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The electronic, thermal, and optical properties of graphene-based materials depend strongly on the fabrication method used and can be further manipulated through the use of metal nanoparticles deposited on the graphene surface. Metals that strongly interact with graphene such as Co and Ni can form strong chemical bonds which may significantly alter the band structure of graphene near the Dirac point. Weakly interacting metals such as Au and Cu can be used to induce shifts in the graphene Fermi energy, resulting in doping without significant alteration to the graphene band structure. The deposition and nucleation conditions such as deposition rate, annealing temperature and time, and annealing atmosphere can be used to control the size and distribution of metal nanoparticles. Under ideal conditions, self-assembled arrays of nanoparticles can be obtained on graphene-based films for use in new types of nanodevices such as evanescent waveguides.

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Section: Specific Properties and Applications Of Graphene Thin Films mentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Graphene Thin Films and Graphene Decorated with Metal Nanoparticles

Bazylewski¹,

Akbari-Sharbaf²,

Ezugwu³

et al. 2016

Crystalline and Non-Crystalline Solids

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“…Both the amplitude and phase of the near-field can be mapped, with phase-sensitive c-SNOM measurements allowing detection of the mode properties of light as it propagates through nanoscale waveguides composed of nanoparticles or nanowires [28,29]. With these capabilities, construction of electric and magnetic vector field maps in the near-field of exotic nanostructures, nanoparticles and nano-antennas has been accomplished [8,30,31].…”

Section: Imaging Electrical and Magnetic Near-fieldsmentioning

confidence: 99%

“…It has been shown recently that arrays of copper nanoparticles can be thermally nucleated from a thin layer of copper deposited on few layer graphene sheets [28]. Under controlled conditions of annealing temperature and atmosphere, the nanoparticles can be encouraged to form ordered arrays with interesting optoelectronic properties [28].…”

Section: Optimization Of Nano-optical Devicesmentioning

confidence: 99%

“…In the following section, applications of 3D SNOM compared to traditional 2D scanning are discussed, with examples of the use of 3D SNOM to study and improve the design of organic solar cells, nano-aperture antennas, nanoparticle arrays, and photonic crystal waveguides [28,29,34,[48][49][50][51][52]. Figure 5 illustrates the equipment setup that can be used for 3D SNOM measurements.…”

Section: Applications Of 3d-snommentioning

confidence: 99%

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A Review of Three-Dimensional Scanning Near-Field Optical Microscopy (3D-SNOM) and Its Applications in Nanoscale Light Management

2017

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Abstract:In this article, we present an overview of aperture and apertureless type scanning near-field optical microscopy (SNOM) techniques that have been developed, with a focus on three-dimensional (3D) SNOM methods. 3D SNOM has been undertaken to image the local distribution (within~100 nm of the surface) of the electromagnetic radiation scattered by random and deterministic arrays of metal nanostructures or photonic crystal waveguides. Individual metal nanoparticles and metal nanoparticle arrays exhibit unique effects under light illumination, including plasmon resonance and waveguiding properties, which can be directly investigated using 3D-SNOM. In the second part of this article, we will review a few applications in which 3D-SNOM has proven to be useful for designing and understanding specific nano-optoelectronic structures. Examples include the analysis of the nano-optical response phonetic crystal waveguides, aperture antennae and metal nanoparticle arrays, as well as the design of plasmonic solar cells incorporating random arrays of copper nanoparticles as an optical absorption enhancement layer, and the use of 3D-SNOM to probe multiple components of the electric and magnetic near-fields without requiring specially designed probe tips. A common denominator of these examples is the added value provided by 3D-SNOM in predicting the properties-performance relationship of nanostructured systems.

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