Structural change from crystalline to amorphous states in siloxene by thermal annealing

Ubara, H.; Imura, Toru; Hiraki, Akio; Hirabayashi, I.; Morigaki, Kazuo

doi:10.1016/0022-3093(83)90665-8

Cited by 39 publications

(16 citation statements)

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“…9 is observed. 40 Still, agreement between PLE spectra for siloxene reported 38 and those seen here ͑Fig. 7͒ is not convincing.…”

Section: Discussionmentioning

confidence: 44%

“…Thus, the better agreement between annealed siloxene and the PS powder may probably indicate that the PS powder has some relation to some Si:O:H alloy, but not to the ring structure of siloxene. In addition, two problems exist, namely, ͑i͒ that for siloxene, the ratio of silicon atoms to oxygen atoms remains as 2:1, independent of the annealing, 40 and according to Ref. 35, the content of oxygen in PS is much below that in siloxene.…”

Section: Discussionmentioning

confidence: 99%

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Experimental study of the energy-band structure of porous silicon

Andersen

Veje

1996

Phys. Rev. B

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Porous silicon samples consisting of either as-grown films, annealed films, or powders have been studied with photoluminescence, ͑10-700 K͒ and photoluminescence excitation. In addition, absorption measurements have been carried out on powder. Results are presented and discussed in terms of current models for the luminescence properties of porous silicon. The conclusion is, that for the samples produced and studied here, the luminescence is of molecular nature. From the data, an energy-level diagram related to the luminescence is constructed, and the nature of the band structure is discussed. Of all models proposed for the photoluminescence properties of porous silicon, our data are compatible only with a recently proposed model based on oxygen-related centers. ͓S0163-1829͑96͒00120-8͔

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“…9 is observed. 40 Still, agreement between PLE spectra for siloxene reported 38 and those seen here ͑Fig. 7͒ is not convincing.…”

Section: Discussionmentioning

confidence: 44%

Section: Discussionmentioning

confidence: 99%

Experimental study of the energy-band structure of porous silicon

Andersen

Veje

1996

Phys. Rev. B

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“…Structural relaxation was performed using the conjugate gradient technique [15] in which all atoms were allowed to relax, and no constraints were imposed on the system. Figure 2 illustrates the minimum energy structures found for siloxene nanotubes, for the (8,0) and (8,8) nanotubes, respectively. The siloxene nanotube structures can be understood in terms of those of the conventional graphitic carbon nanotubes by simply replacing the flat hexagons present in the latter by cyclohexane-like rings, just in the same way as the layered structure of the siloxene is related to that of graphene.…”

Section: Resultsmentioning

confidence: 99%

“…In the Wö hler synthesis [1] the Ca ions are washed out and hydroxyl groups as well as hydrogen atoms are bound to the silicon leading to an ideal composition Si 6 H 3 (OH) 3 and the structure as drawn in Fig. 1 [7,8].…”

Section: Introductionmentioning

confidence: 99%

Tubular Structures of Siloxenes

Seifert

Frauenheim

Köhler

et al. 2001

phys. stat. sol. (b)

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Subject classification: 61.48.+c; 71.20.Tx; S5.11; S6; S10.1Using density-functional tight-binding theory we demonstrate that silicon-based tubular nanostructures in the form of siloxenes are stable and energetically viable. The structures studied here have a semiconducting gap which is independent of the chirality, but showing an increase of the gap size with increasing diameter towards that of the corresponding siloxene layer. The Si-based nanotubes are less stiff than tubes of other chemical compositions so far studied, but having Young's modulus of a magnitude similar to the bulk modulus of diamond silicon.

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“…1͑a͒. The structural changes in Wöhler siloxene with thermal treatment were studied by Ubara et al 11 A thermal anneal at 300°C in vacuum destroys the two-dimensional ordered structure and transfers it into a three-dimensional disordered structure.…”

Section: Introductionmentioning

confidence: 99%

Structure and optical properties of the planar silicon compounds polysilane and Wöhler siloxene

et al. 1997

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The two-dimensional silicon backbone structure of planar polysilane and Wöhler siloxene is responsible for their exciting luminescing properties. We have prepared single crystals of siloxene by a topotactic reaction from crystalline CaSi 2 . The chemical composition was determined as ͓Si 6 H 3 ͑OH͒ 3 ͔ n . The x-ray crystal structure analysis identifies the so-called Wöhler siloxene as 2D-poly͓1,3,5-trihydroxocyclohexasilane͔. Polysilane exhibits the same structural properties but with a chemical composition ͓Si 6 H 6 ͔ n . The optical properties ͑infrared transmission, photoluminescence, excitation spectroscopy͒ of these well-defined materials are presented. A heat treatment above 350°C in vacuum of Wöhler siloxene results in a destruction of the planar ϱ 2 ͓Si Ϫ ͔ structure by internal rearrangements, which is evidenced by the x-ray-diffraction pattern and characteristic changes in the optical spectra. The involvement of Wöhler siloxene in the optical properties of porous Si is critically reviewed.

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Structural change from crystalline to amorphous states in siloxene by thermal annealing

Cited by 39 publications

References 1 publication

Experimental study of the energy-band structure of porous silicon

Experimental study of the energy-band structure of porous silicon

Tubular Structures of Siloxenes

Structure and optical properties of the planar silicon compounds polysilane and Wöhler siloxene

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