Electrical and magnetic properties of nanomaterials containing iron or cobalt nanoparticles

Yurkov, G. Yu.; Fionov, A. S.; Koksharov, Yu. A.; Koleso, V. V.; Губин, С. П.

doi:10.1134/s0020168507080055

Cited by 58 publications

(31 citation statements)

References 34 publications

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“…Two principal factors cause the properties of nanomaterials to differ significantly from bulk materials such as the increase in the relative surface area and the quantum effects. These factors can substantially change and/or enhance the well-known bulk properties such as chemical reactivity [13], mechanical strength [14], electrical and magnetic [15], and optical characteristics [16]. As the particle size decreases, a greater proportion of atoms are found at the surface than in the interior [17].…”

Section: Nanomaterialsmentioning

confidence: 99%

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Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Sherbini

Parigger

2018

Atoms

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This work communicates results from optical emission spectroscopy following laser-induced optical breakdown at or near nanomaterial. Selected atomic lines of silver are evaluated for a consistent determination of electron density. Comparisons are presented with Balmer series hydrogen results. Measurements free of self-absorption effects are of particular interest. For several silver lines, asymmetries are observed in the recorded line profiles. Electron densities of interest range from 0.5 to 3 × 10 17 cm −3 for five nanosecond Q-switched Nd:YAG radiation at wavelengths of 1064 nm, 532 nm, and 355 nm and for selected silver emission lines including 328.06 nm, 338.28 nm, 768.7 nm, and 827.3 nm and the hydrogen alpha Balmer series line at 656.3 nm. Line asymmetries are presented for the 328.06-nm and 338.28-nm Ag I lines that are measured following generation of the plasma due to multiple photon absorption. This work explores electron density variations for different irradiance levels and reports spectral line asymmetry of resonance lines for different laser fluence levels.

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Section: Nanomaterialsmentioning

confidence: 99%

“…The quantum effects can begin to dominate the properties of matter as its size is reduced to the nano-scale. Nanoparticles are of interest because of their inherent new properties when compared with larger particles of the same materials [12][13][14][15][16][17].…”

Section: Nanomaterialsmentioning

confidence: 99%

Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Sherbini

Parigger

2018

Atoms

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“…Furthermore, metallic nanoparticles are chemically unstable and oxidize quickly in the air, resulting in a reduction of magnetism. Thus, for many applications, it is essential throughout or after synthesis to stabilize thermodynamically magnetic nanoparticles counter to oxidation/degradation . Grafting or coating technique with an organic or inorganic layer, for instant silica, polymer, or carbon is widely used to avoid destabilization.…”

Section: Introductionmentioning

confidence: 99%

“…The use of a protective layer of a petrochemical‐based plastic such as PE, polypropylene, and poly(tetrafluoroethylene) is a good option, depending on the choice of the application. These polymers are thermally stable, chemically inert and have exceptional rheological and processing properties; their high dielectric strength makes them suitable for the fabrication of complex shapes and large parts .…”

Section: Introductionmentioning

confidence: 99%

Polyethylene Nanocomposites with Ni, Co, and Fe Carbon‐Based Magnetic Fillers

Nisar

Thue

Heck

et al. 2020

Polymer Engineering & Sci

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In the present study, the effect of Ni, Co, and Fe carbonbased magnetic fillers (Ni-C, Co-C, and Fe-C) was investigated on the magnetic, mechanical, thermal, and morphological properties of polyethylene nanocomposites. The in situ polymerization technique was used to prepare nanocomposites of polyethylene from the ethylene monomer introducing small amounts of filler ranging from 1 to 2 wt.%. The metal-carbonized fillers were obtained by pyrolysis of wood sawdust activated by Ni, Co, or Fe salts. X-ray diffraction showed that the fillers were of nanometric size. Thermogravimetric analysis was executed to investigate the thermal strength of the materials as well as to calculate the metal content in the carbon-based fillers. The onset degradation temperature showed an enhancement of 17 C, whereas the maximum degradation temperatures increased 4 C with the introduction of the filler. Differential scanning calorimetry indicated an improvement of 3 C in crystallization temperature, whereas the melting temperature remained unchanged compared to neat polyethylene. The filler was shown to increase the modulus of elasticity of the nanocomposites. The addition of 1.0 wt.% of the metal-carbonized material in the diamagnetic polymer matrix resulted in a thermoplastic nanocomposite with ferromagnetic behavior. POLYM. ENG. SCI., 60:988-995, 2020. 989 e C.A. = catalytic activity [kgPE [Zr] −1 h −1 bar −1 ]. f X c = degree of crystallinity calculated from the DSC curve.

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“…For decades, nanoparticles (NPs) have been of great interest to researchers because of their unique chemical [1], electronic [2], magnetic [3] and optical properties [4]. With the development of plasmonics research, the surface plasmon property of NPs has been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser fabrication of silver plasmonic structures for application as single particle SERS detectors

Huang

Sivayoganathan

et al. 2014

Mater. Res. Express

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This work demonstrates the feasibility of fabricating silver nanoparticles (NPs) into sub-micron and micron-sized core-satellite structures by exposure to femtosecond laser radiation. We find that the size and shape of these structures can be tailored by adjusting laser fluence (1.8-10.5 J cm −2) and irradiation time (20-60 min), along with the concentration of NPs in aqueous solution (0.01-0.05 mM). Raman measurements of adenine molecules adsorbed on these sub-micron substrates indicate that core-satellite structures having complex shapes are effective as sensitive surface enhanced Raman spectroscopy (SERS) substrates. The sensitivity is such that these structures are potentially useful as single particle SERS substrates for bio-sensing. Finite difference time domain (FDTD) simulation results indicate that these structures can be generated by the joining of NPs in response to localized surface plasmon induced hotspots.

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Electrical and magnetic properties of nanomaterials containing iron or cobalt nanoparticles

Cited by 58 publications

References 34 publications

Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Polyethylene Nanocomposites with Ni, Co, and Fe Carbon‐Based Magnetic Fillers

Femtosecond laser fabrication of silver plasmonic structures for application as single particle SERS detectors

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