Silver Particle Carbon-Matrix Composites as Thick Films 
for Electrical Applications

Hsu, Yuan-Chan; Chung, D.D.L.

doi:10.1007/s11664-007-0187-4

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…Previously, Hsu et al had reported a sheet resistance of 890 KΩ □ −1 for a thick film (~150 μm) of a composite of silver particles in a carbon matrix pasted over an alumina substrate. 43 The silver particles were present in the composite with ~8% volume fraction. 43 Coating of carbon black and polyelectrolytes on a nonconducting polyĲethylene terephthalate) substrate in a layer-by-layer manner was reported to have a sheet resistance of 10s of KΩ □ −1 for the film thickness of ~1.5 μm.…”

Section: Resultsmentioning

confidence: 99%

“…43 The silver particles were present in the composite with ~8% volume fraction. 43 Coating of carbon black and polyelectrolytes on a nonconducting polyĲethylene terephthalate) substrate in a layer-by-layer manner was reported to have a sheet resistance of 10s of KΩ □ −1 for the film thickness of ~1.5 μm. 44 The simple microwave-based coating process of OLCSs reported here is effective in producing conducting carbon thin films.…”

Section: Resultsmentioning

confidence: 99%

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Rapid growth of onion-like carbon nanospheres in a microwave oven

et al. 2016

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Onion-like carbon spheres (OLCSs) were synthesized by heating a mixture of naphthalene and graphite powder inside a kitchen microwave oven for ∼1 min under atmospheric conditions. Naphthalene, a hydrocarbon, provides carbon for growth, while graphite plays the crucial role of microwave absorber. The size of the OLCS particles was distributed over a wide range from a few 10s of nm up to a few μm. The OLCS particles self-assembled in a long range chain-like structure. The duration of microwave heating and the ratio of the precursor components were found to be important factors affecting the size and density of the particles. Alternative hydrocarbon sources and microwave absorbers were also examined for OLCS growth. Addition of ferrocene as a catalyst to the precursor mixture of naphthalene and graphite resulted in the formation of highly crystalline carbon-encapsulated iron (in the form of oxide/carbide) nanoparticles with a core-shell structure. The as-synthesized OLCS mixture containing graphite as the precursor was mixed with poly-alpha olefin oil (PAO4) as an additive. A significantly lower friction coefficient and wear rate were obtained with this mixture as compared to the neat PAO4 and PAO4+graphite mixture. Microwave heating was also employed to coat thin films of OLCSs on alumina/glass substrates. The conductivity of these films was measured using the four probe method. The microwave-assisted method used to produce OLCSs has several advantages like cost and energy efficiency, minimal preprocessing, etc. This technique can be of industrial importance for bulk productions of OLCSs and graphitic shell-encapsulated metal nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Rapid growth of onion-like carbon nanospheres in a microwave oven

et al. 2016

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“…When the ratio Ag:Fe 3 O 4 is 1.75:1 the conductivity increases about 6 orders of magnitude and then it remains approximately constant with an increase in the silver content. Even though the maximum conductivity obtained (about 10 -2 S/cm) is much lower than the conductivity of bulk silver (about 10 4 S/cm) [21], the materials with Ag:Fe 3 O 4 ratio ¥ 1.75 have acceptable values of electrical conductivity. This increase in the electrical conductivity with the silver content was also observed by Sun et al [12], who attributes this behavior to the covering of Fe 3 O 4 nanoparticles by a thin layer of metallic silver.…”

Section: Fig 3 Herementioning

confidence: 74%

Synthesis and Properties of Bifunctional Fe$_{3}$O$_{4}$/Ag Nanoparticles

Landa¹,

Jorge

Molina³

et al. 2013

IEEE Trans. Magn.

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In this work, a facile synthesis of Fe 3 O 4 /Ag nanoparticles, with magnetic properties and electrical conductivity, was successfully developed, by reducing Ag(I) ions with D-Glucose, in the presence of a dispersion of superparamagnetic Fe 3 O 4 nanoparticles, under ultrasound treatment. Poly(vinylpyrrolidone) (PVP) was used as protecting agent and Ag(I) were incorporated in different molar ratios with respect to Fe 3 O 4 nanoparticles. The obtained particles were characterized by XRD studies, SEM and TEM observation, Energy Dispersive X-Ray Spectroscopy (EDS), DC magnetization and conductivity measurements. From TEM and SEM observation it was found that the PVP protection has shown to be partial, as the Fe 3 O 4 nanoparticles have a lower diameter after the reduction treatment. Despite this, the particles retain the superparamagnetic behavior and the saturation magnetization decreases as the Ag content increases. From conductivity measurements, a minimum Ag(I)/Fe 3 O 4 molar ratio = 1.75 was needed in order to observe electrical conductivity in the metallic regime.

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“…10 6 S/m) of silver bulk. 18 This may be caused by the different size at which the Ag nanoparticles were measured. Furthermore, the conductivity of the Fe 3 O 4 /Ag core-shell nanoparticles prepared for various reaction times is also compared in Table I, showing that the conductivity of Fe 3 O 4 /Ag coreshell nanoparticles increases with the reaction time.…”

Section: Resultsmentioning

confidence: 99%

Controlled Synthesis of Fe3O4/Ag Core–Shell Composite Nanoparticles with High Electrical Conductivity

Sun

Tian

et al. 2011

Journal of Elec Materi

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The presented method provides an easy processing route to synthesize Fe 3 O 4 / Ag core-shell composite nanoparticles. Their structures were characterized by x-ray diffraction and transmission electron microscopy. The average size of the Fe 3 O 4 core and Ag shell was about 32.0 nm and 5.0 nm (or 28.0 nm), respectively. Furthermore, magnetic measurements showed that the composite nanoparticles exhibited typical superparamagnetic behavior, specific saturation magnetization of ca. 24.0 emu/g, and intrinsic coercivity of 106.0 Oe. At the same time, high conductivity (64.7 S/cm) of the composite nanoparticles was also observed. This method provides an opportunity to synthesize other core-shell (Fe 3 O 4 ) nanoparticles in a single step.

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Silver Particle Carbon-Matrix Composites as Thick Films for Electrical Applications

Cited by 5 publications

References 16 publications

Rapid growth of onion-like carbon nanospheres in a microwave oven

Rapid growth of onion-like carbon nanospheres in a microwave oven

Synthesis and Properties of Bifunctional Fe$_{3}$O$_{4}$/Ag Nanoparticles

Controlled Synthesis of Fe3O4/Ag Core–Shell Composite Nanoparticles with High Electrical Conductivity

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