Fabrication of Metal Air Cells Using Sintered Si Nanopaste with Reduced Si Nanoparticles

Saiki, Taku; Nakamura, Kai; Tokumoto, Jyuichi; Nakamura, Kazuhiro; Uematsu, T.

doi:10.2184/lsj.45.6_364

Cited by 1 publication

(4 citation statements)

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“…At the same time, a technology have been developed to make electrical circuits at low temperatures of below 470K using paste or ink consisting of Au [7], Ag [8][9], Cu [10], Fe [11,12], Al [11,12], Mg [12] nanoparticles owing to the phenomena of melting point depression. The metal nanoparticle paste and ink have been often sintered by finance or pulsed light like Xe flash lamp [8][9] or laser [12,13] in a short time. A free-form electrical circuit can be made in a short time and for low cost by using them.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, many methods to produce metal or nonmetal nanoparticles exist. All of them, a method for producing the metal nanoparticles using laser ablation in liquids with high speed and low cost has especially attracted attention [11][12][13][14][15][16][17][18][19]. Many kinds of magnetic nanoparticles [22][23][24][25][26][27][28][29][30][31][32][33][34] (such as Fe [22][23][24][25][26], iron oxides [28], Au [29], Ni [28], and Pd [29][30][31] nanoparticles) have already been researched.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, Si nanoparticles, which can emit visible light owing to the quantum size effects, can be used in color displays [15][16][17][18][19][20][21]. Also, researches on the spin wave propagation in Si nanoparticles [35][36], optical switch for optical computing using carrier effect by controlling the transparency of the material [37][38][39][40], application to air cells [13] are conducted now.…”

Section: Introductionmentioning

confidence: 99%

“…The goal of our research is to develop low-power-consuming semiconductor devices by applying the prepared Si nanopolycrystalline with a reduced skin effect to semiconductors. We have recently fabricated nano-structured metals by the bottom-up process [11][12][13]. A Sintered metal nanopolycrystalline body with low resistivity is a new material, and the resistivity has not been adequately investigated.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Appearance of Ferromagnetic Property for Si Nanopolycrystalline Body and Vanishing of Electrical Resistances at Local High Frequencies

Saiki

Iida

Inada

2018

Journal of Nanomaterials

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Reduction in the skin effect for the sintered Si nanopolycrystalline body as an electricity conductor at a high frequency due to its nano-structure was studied. Singular vanishing of electrical resistances near a local high magnetic harmonic frequency of a few MHz was observed. This phenomenon has not been observed for conventional ferromagnetic metals. The measured electrical resistances changed to almost 0 mΩ at room temperature. At the same time, negative resistance of the sintered Si nano-polycrystalline body was observed. It will be applicable to electronic transmittance lines or semiconductors. Numerical calculation was also performed on the electrical resistance with frequency dependency while considering the electric field and magnetic field in the sintered Si nanopolycrystalline body. The experimental and calculated results are compared.The calculation could explain the variation of the relative permittivity of the Si nanopolycrystalline and the phenomenon for vanishing the resistivity at frequency of MHz theoretically.Reduced Si nanoparticles from SiO2 powder were synthesized by laser ablation in liquid. A Si nano-polycrystalline body made of the reduced Si nanoparticles was fabricated. It was found by measuring the magnetization property of the body that the sintered Si nano-polycrystalline body has ferromagnetism. Dangling bonds (unpaired electrons) have long been known to occur due to defects in Si crystals. Perfect Si without defective crystals has no dangling bonds. However, Si nanoparticles have many dangling bonds. High-density dangling bonds cause the sintered Si nanopolycrystalline to have ferromagnetism. In this study, the density of the unpaired electrons in the sintered Si nanopolycrystalline was observed using ESR. It has been clarified that the Si nanopowder and the sintered Si nanopolycrystalline have numerous dangling bonds. Both densities of the dangling bonds were evaluated.

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