Synthesis of Mg&lt;sub&gt;2&lt;/sub&gt;Si/MgO Nanofibers Using SiO&lt;sub&gt;2&lt;/sub&gt; Nanofibers in Mg Vapor

Li, W.; Yang, Qi; Tatsuoka, Hirokazu

doi:10.1380/ejssnt.2012.297

Cited by 6 publications

(6 citation statements)

References 15 publications

(21 reference statements)

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“…16 The calculation results show that the mole ratio of MgO:Mg 2 Si is 2:1 as the SiO 2 completely converted into Mg 2 Si and MgO. 17 Figure 8 shows TEM images and the corresponding FFT patterns of the Mg 2 Si/MgO nanowire bundles synthesized at 450 ○ C and 630 ○ C. The results further confirm that the nanowires consist of Mg 2 Si and MgO.…”

Section: Syntheses Of Nanostructure Bundlesmentioning

confidence: 70%

“…It was reported that the Si phase is an intermediate product for the reduction of SiO x to Mg 2 Si and MgO using Mg vapor. 17 No peak due to the Si phase indicates that the reduced Si completely reacted with excess Mg vapor to form Mg 2 Si and the synthesized nanowires consist of Mg 2 Si and MgO. The \x" in SiO x is about 2, so the SiO x is assumed as SiO 2 .…”

Section: Syntheses Of Nanostructure Bundlesmentioning

confidence: 99%

“…The heat treatment was performed at the temperature of 450 ○ C and 630 ○ C for 6 h with the vacuum pressure of 10 À6 Torr. 17 Mg 2 Si nanowire bundles and MnSi 1:7 nanowire arrays were synthesized by the heat treatment of artificial Si nanowire arrays under a Mg vapor and MnCl 2 vapor, respectively. The Si nanowire arrays were fabricated by a simple electroless metal deposition method.…”

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confidence: 99%

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Syntheses of Nanostructure Bundles Based on Semiconducting Metal Silicides

Ishikawa

Tatsuoka

2013

Funct. Mater. Lett.

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A variety of nanostructure bundles and arrays based on semiconducting metal silicides have been synthesized using abundant and non-toxic starting materials. Three types of fabrication techniques of the nanostructure bundles or arrays, including direct growth, template synthesis using natural nanostructured materials and template synthesis using artificially fabricated nanostructured materials are demonstrated. CrSi 2 nanowire bundles were directly grown by the exposure of Si substrates to CrCl 2 vapor at atmospheric pressure. A hexagonal MoSi 2 nanosheet, Mg 2 Si/MgO composite nanowire and Mg 2 Si nanowire bundles and MnSi 1:7 nanowire array were synthesized using a MoS 2 layered material, a SiO x nanofiber bundle, a Si nanowire array, and a Si nanowire array as the templates, respectively. Additionally, the fabrication phenomenon and structural properties of the nanostructured semiconducting metal silicides were investigated. These reactions provided the low-cost and controllable synthetic techniques to synthesize large scale and one-dimensional semiconducting metal silicides for thermoelectric applications.Semiconducting metal silicides have been extensively investigated for silicon-based semiconducting technology and considered as promising materials for the renewable energy technology in the field of thermoelectric and photovoltaic applications. 1,2 Compared to the conventional semiconducting materials, the metal silicides have many advantages, such as low-cost, natural abundance, non-toxicity and easy recycling, therefore, they are considered as environmentally friendly semiconductor materials. Recently, a variety of metal silicides, for example, β-FeSi 2 , Mg 2 Si, MnSi 1:7 , hexagonal MoSi 2 and CrSi 2 , have been successfully grown by various growth techniques. 3-7 However, few metal silicide has been applied for the practical use, which is attributed to the modest figure of merit (ZT) of the metal silicides.One-dimensional nanostructures are attracting a great deal of attention due to their unique properties and novel applications compared to those of bulk materials. A decrease in the thermal conductivity and an increase in the power factor, S 2 , of the nanostructures have been demonstrated by the theoretical calculations and proof of principle experiments, relative to the corresponding bulk structures. [8][9][10][11] Hochbaum et al. reported that the Si nanowires with diameters of about 50 nm exhibit a 100-fold reduction in thermal conductivity, yielding ZT ¼ 0.6 at room temperature. 11 Various nanostructures have been synthesized and charactered, such as wires, rods, nails, ribbons, belts, sheets and rings. It is well-known that a single-walled carbon nanotube can be metallic or semiconductive, depending on the helical angle at which the graphitic sheet is rolled up, 12 which reveals the importance of controlling its morphological and structural properties. Unfortunately, the growth window for the specific morphology is narrow, namely the morphology can be significantly changed as wires, rods, ribbons...

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Section: Syntheses Of Nanostructure Bundlesmentioning

confidence: 70%

Section: Syntheses Of Nanostructure Bundlesmentioning

confidence: 99%

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confidence: 99%

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Syntheses of Nanostructure Bundles Based on Semiconducting Metal Silicides

Ishikawa

Tatsuoka

2013

Funct. Mater. Lett.

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“…Even though Mg 2 Si and MgO are randomly distributed, the bundle structure maintains as the SiO x nanofiber bundle [15,12]. As shown in Figure 1(d), it is observed that the highly oriented, well-aligned nanofibers grew in an orderly fashion with a high density on the substrates.…”

Section: Resultsmentioning

confidence: 91%

“…Mg 2 Si/MgO composite nanowire bundles were synthesized by the exposure of SiO x nanofiber bundles to Mg vapor. The detailed thermal treatment condition is described elsewhere [15].…”

Section: Methodsmentioning

confidence: 99%

Preparations of Nanostructured Silicide Bundles andOxide Arrays

Tatsuoka¹,

Li²,

Meng³

et al. 2014

MST

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A variety of nanostructured silicide bundles and oxide nanowire arrays with abundant, non-toxic materials we are prepared. The CrSi 2 nanowire and Mg 2 Si/MgO composite nanowire bundles were synthesized using a Si substrate and a SiO x nanofiber bundle, respectively. The hexagonal MoSi 2 nanosheet bundles were also synthesized using a MoS 2 layered material as a template. In addition, ZnO, CuO/Cu 2 O and α-Fe 2 O 3 nanowire arrays were prepared on semiconductor or metallic substrates. The growth phenomena and the structural properties of the nanostructured materials awere investigated. In addition, the preparations of axial and radial nanowire structures weare examined. AbstrakPembuatan Berkas Silisida dan Rangkaian Oksida Ternanostruktur. Beragam jenis berkas silisida dan rangkaian kawat nano oksida ternanostruktur dapat dibuat dengan bahan baku tidak beracun yang jumlahnya berlimpah. Kawat Nano CrSi 2 disintesiskan dengan substrat Si, sedangkan berkas-berkas kawat nano komposit Mg 2 Si/MgO disintetiskan dengan berkas serat nano SiO x . Berkas-berkas lembaran nano MoSi 2 heksagonal juga disintesiskan dengan bahan baku berlapis MoS 2 sebagai contoh dasar. Selain itu, rangkaian-rangkaian kawat nano ZnO, CuO/Cu 2 O, dan α-Fe 2 O 3 juga dibuat pada substrat semikonduktor atau metalik. Penyelidikan dilakukan terhadap fenomena perkembangan dan sifatsifat struktural pada bahan-bahan baku ternanostruktur. Selanjutnya dilakukan pula pengamatan terhadap pembuatan struktur-struktur kawat nano aksial dan radial.

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