Doping graphene thin films with metallic nanoparticles: Experiment and theory

Akbari-Sharbaf, Arash; Ezugwu, Sabastine; Ahmed, Muhammad Shafiq; Cottam, M. G.; Fanchini, Giovanni

doi:10.1016/j.carbon.2015.08.021

Cited by 25 publications

(19 citation statements)

References 25 publications

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“…This is particularly true in many cases where assembling metallic layers on top of graphene sheets is not viable for practical applications for which access to the graphene surface is required. Figures 4a, b and c from Akbari-Sharbaf et al [5] show scanning electron micrographs (SEM) of Cu-NPs assembled on graphene-RNA-based films deposited by vacuum filtration followed by drying in a vacuum desiccator and annealing at 550°C for 5 h to remove RNA. Cu-NPs were deposited using RF sputtering of Cu metal target under high-vacuum conditions using very short sputter times to produce thin metal films, followed by annealing at temperatures ranging from 300-550°C for 1-4 h in a glove box under a nitrogen atmosphere.…”

Section: Graphene Thin Films Decorated With Metal Nanoparticlesmentioning

confidence: 99%

“…The plot of the work-function shift as a function of the difference, Δε = ε mod -ε 0 , of the local ionization energy of i and j-type carbon sites is reported in Figure 5c (right panel). For Δε > 0.3 eV, the variations in work function change (Δφ) between the two systems are large, and shows that for stronger metal-carbon bonding the particle diameter plays a more significant role in shifting the work function away from the Dirac point of graphene, in addition to the major role played by the area fraction covered by metallic particles [5].…”

Section: Graphene Thin Films Decorated With Metal Nanoparticlesmentioning

confidence: 99%

“…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%

See 2 more Smart Citations

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: Graphene Thin Films Decorated With Metal Nanoparticlesmentioning

confidence: 99%

Section: Graphene Thin Films Decorated With Metal Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Graphene Thin Films and Graphene Decorated with Metal Nanoparticles

Bazylewski¹,

Akbari-Sharbaf²,

Ezugwu³

et al. 2016

Crystalline and Non-Crystalline Solids

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the zero-band gap nature of graphene restricts its application in optoelectronic devices effectively. This obstacle could be overcome by the modification of graphene surface with metals, metal oxides, quantum dots, and will further broaden the application field with tunable properties [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of graphene: CdSe quantum dots/CdS nanorod heterojunction photodetector and role of graphene to enhance the photoresponsive characteristics

et al. 2021

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Integration of graphene with semiconducting quantum dots (QDs) provides an elegant way to access the intrinsic properties of graphene and optical properties of QDs in a single hand to realize the high-performance optoelectronic devices. In the present study, high-performance photodetector based on graphene: CdSe QDs/CdS nanorod heterostructures, are demonstrated. The resulting heterojunction photodetector with device configuration ITO/graphene: CdSe/CdS nanorods/Ag show excellent operating characteristics including a maximum photoresponsivity of 15.95 AW -1 and specific detectivity of 6.85×10 12 Jones measured at 530 nm. The device exhibits a photoresponse rise time of 545 ms and a decay time of 539 ms. Furthermore, the effect of graphene nanosheets on the performance enhancement of heterojunction photodetector was explored. The results indicate that, due to the enhanced energy transfer from photoexcited QDs to graphene layer, light absorption is increased and excitons are generated. Also, the graphene: CdSe QDs/CdS nanorod interface can facilitate charge carrier transport effectively. This work provides a promising approach to develop high-performance visible-light photodetectors and utilization of advantageous features of graphene in optoelectronic devices.

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“…The noble metals group including silver, gold and platinum in nanometer scale size, which are responsible for different properties, concerning the bulk material, renders them suitable for applications in catalysis, electronic, nonlinear optics and biomaterial applications [1][2][3][4] . Concerning the synthesis of metal nanoparticles many methods have been mentioned in literature [5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterizations of Metallic Nanoparticles in Chitosan by Chemical Reduction

León¹,

Cárdenas²,

Aguayo³

2017

J. Chil. Chem. Soc.

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SUMMARYOne of the applications of chitosan is based on its ability to stabilized metallic nanoparticles with minimum chitosan metal molar ratio. This work describes the synthesis and characterization of Ag, Au, Pt, and Cu nanoparticles stabilized by chitosan through chemical reduction of metallic salts by sodium borohydride (NaBH 4 ).The properties of bionanocomposites were studied in terms of their surface plasmon resonance, crystalline structure, average diameter size, particle distributions and functional groups. The samples were characterized by TEM, electron diffraction, UV-Visible and FTIR. The stability of the colloids at room temperature were also measured. A high stability for the colloidal dispersion with chitosan can be observed (> three months). We found that TEM studies show a size distribution between 6 and 10 nm, depending on metals and chitosan metal relation. Electron diffraction analysis for the metallic nanoparticles shows the presence of Ag, Au, Pt and Cu. The FT-IR exhibit the presence of the chitosan in the stabilisation of metallic nanoparticles.

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Doping graphene thin films with metallic nanoparticles: Experiment and theory

Cited by 25 publications

References 25 publications

Graphene Thin Films and Graphene Decorated with Metal Nanoparticles

Graphene Thin Films and Graphene Decorated with Metal Nanoparticles

Fabrication of graphene: CdSe quantum dots/CdS nanorod heterojunction photodetector and role of graphene to enhance the photoresponsive characteristics

Synthesis and Characterizations of Metallic Nanoparticles in Chitosan by Chemical Reduction

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