Plasmonic Core–Shell Silicon Carbide–Graphene Nanoparticles

Coleman, Devin; Mangolini, Lorenzo

doi:10.1021/acsomega.9b00933

Cited by 13 publications

(9 citation statements)

References 36 publications

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“…Although many previous works used the same formula [i.e., eq ], which only depends on the number of graphene layers (or multilayer thickness) for the dielectric function of multilayer graphene (see e.g., refs − ), we compare the values of dielectric function of graphene obtained from eq with experimental values obtained from the reflectivity spectroscopy. − Table shows the theoretical and experimental values of dielectric function for monolayer graphene as well as multilayer for some specific wavelengths that there are experimental values.…”

Section: Resultsmentioning

confidence: 99%

Optical and Photothermal Properties of Graphene Coated Au–Ag Hollow Nanoshells: A Modeling for Efficient Photothermal Therapy

Farokhnezhad

Esmaeilzadeh

2019

J. Phys. Chem. C

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We study the optical and photothermal properties of graphene coated gold−silver alloy hollow nanoshells (Au−Ag HNSs) using the effective medium theory combined with the Pennes bioheat and Arrhenius equations. To increase the stability of Au−Ag HNSs in the presence of oxidants, acid, and heating, we propose the use of graphene as a protective shell on Au−Ag HNSs in photothermal therapy (PTT) applications. Calculating the extinction efficiency in tumor tissue, we show that the surface plasmon resonant (SPR) peak of graphene coated Au−Ag HNSs can be easily adjusted within a wide range of biological windows by changing the inner radius, the Au−Ag shell thickness, and the alloy composition of Au−Ag. In addition, the effect of concentration of nanoparticles and the number of graphene layers on the temperature rise in the tumor tissue are investigated.To achieve a comprehensive study, the thermal damage in tumor tissue is also investigated and the region of tumor in which the irreversible thermal damage can occur is determined. Our results suggest that graphene coated Au−Ag HNSs can be used as an excellent class of nanoagents for PTT applications.

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Section: Resultsmentioning

confidence: 99%

Optical and Photothermal Properties of Graphene Coated Au–Ag Hollow Nanoshells: A Modeling for Efficient Photothermal Therapy

Farokhnezhad

Esmaeilzadeh

2019

J. Phys. Chem. C

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“…[1][2][3] While these processes have been initially investigated for the case of silicon and carbon nanoparticles, in recent years, there has been a multitude of reports focusing on more complex chemistries, such as nitrides [4][5][6] and carbides. [7][8][9] In addition, these processes allow for the production of particles locked in a nonequilibrium phase, that is, particles with a glassy or amorphous structure. This can be easily achieved by varying parameters such as electrical power input, lowering it to the point in which sufficient plasma density is achieved to activate the chemical precursor and drive the nucleation of particles but not sufficient to drive their crystallization.…”

Section: Introductionmentioning

confidence: 99%

Nonthermal plasma synthesis of silicon carbonitride

Herzberg

Mathaudhu

Mangolini

2023

Plasma Processes & Polymers

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The use of a low‐temperature plasma for the synthesis of amorphous silicon carbonitride (SiCN) nanoparticles enables the realization of sintered bulk samples with high thermal stability. Amorphous SiCN nanoparticles are produced from a mixture of silane, methane, and ammonia utilizing a mid‐pressure, radio‐frequency, continuous flow reactor. Particle characterization shows that the nanoparticles are largely amorphous with some crystalline silicon and silicon carbide domains <10 nm in size. Compositional tuning, controlled by varying the precursor flow rates, coupled with the uniform mixing of elements at the nanoscale, results in samples that resist crystallization even when sintered at temperatures as high as 2000°C. This study suggests that the low‐temperature plasma synthesis of nanoparticles has great potential to produce bulk structural materials for application in harsh environments.

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“…Nonthermal plasmas can generate radical species at low temperatures that otherwise could not be generated without excessive heat. The result is a highly reactive electro-chemical environment that has been utilized in the synthesis of a large class of nanomaterials that includes many elemental nanoparticles [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51], particles of doped semiconductors [52,53], particles that were coated with ligands in an integrated allgas-phase process [54][55][56], and nanocomposites [40-42, 57, 58]. To date, nonthermal plasmas have been scantly applied to the synthesis of metal nanoparticles, and carbon contamination from the metal organic precursors was found to be a major problem [49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Inductively coupled nonthermal plasma synthesis of aluminum nanoparticles

Beaudette

Andaraarachchi

et al. 2021

Nanotechnology

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Metallic nanoparticles of aluminum (Al), a nontoxic and earth-abundant element, are relevant to plasmonic and energetic applications. However, monodisperse Al nanoparticles are difficult to synthesize using all gas-phase approaches, especially in the 10 to 20 nm size range; yet, many applications require particles of this size due to their enhanced properties. Here, an inductive nonthermal plasma reactor fed with aluminum trichloride (AlCl 3 ) and Ar is used to synthesize single-crystal aluminum nanoparticles. The particles can be produced with or without hydrogen. Several reactor conditions such as AlCl 3 vapor concentration, flow rates, and power are found to strongly influence particle properties such as the oxide shell thickness, particle mono-dispersity, and particle size. Significant quantities of Ar relative to AlCl 3 , short residence times of 10 s of ms, and pressures in excess of 4.7 Torr are required to form Al particles with geometric mean sizes of 10-20 nm and geometric standard deviations as low as 1.3. While the Al nanoparticles are covered with 2-4 nm thick oxide shells, the best synthesis conditions yield particle sizes determined by electron microscopy that are comparable to crystallite sizes determined from x-ray diffraction.

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Plasmonic Core–Shell Silicon Carbide–Graphene Nanoparticles

Cited by 13 publications

References 36 publications

Optical and Photothermal Properties of Graphene Coated Au–Ag Hollow Nanoshells: A Modeling for Efficient Photothermal Therapy

Optical and Photothermal Properties of Graphene Coated Au–Ag Hollow Nanoshells: A Modeling for Efficient Photothermal Therapy

Nonthermal plasma synthesis of silicon carbonitride

Inductively coupled nonthermal plasma synthesis of aluminum nanoparticles

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