Characterization of Layered Polysilane

Abstract

Layered polysilane synthesized according to a new recipe was characterized mainly by photoluminescence (PL) measurement. The PL spectrum of the as-prepared sample had a broad peak at 2.0 eV. The PL peak of a sample annealed at 300°C was also at 2.0 eV, and its PL intensity was several times greater than that of the as-prepared sample. The PL peak of a sample annealed at 400°C was red-shifted and its PL intensity was lower than those of the others. On the other hand, the PL emission from a sample rinsed in HF solution was blue-shifted and had a little lower intensity. The interpretations of the experimental results are discussed.

Silicene, Siloxene, or Silicane? Revealing the Structure and Optical Properties of Silicon Nanosheets Derived from Calcium Disilicide

“…There have been several reports on the synthesis of Si-NSs obtained from the deintercalation of CaSi 2 with aqueous HCl; ,− however, the reported structures have been inconsistent. For example, recent reports have indicated that deintercalation of CaSi 2 leads to a Si-NS structure that can be described by a Si backbone that is terminated with H, O, OH, and alkyl groups; conversely, other reports have concluded that deintercalation leads to Kautsky-type siloxene or even 2D sheets consisting of a silicon oxide framework that is terminated with OH groups.…”

Si and Ge‐Based Anode Materials for Li‐, Na‐, and K‐Ion Batteries: A Perspective from Structure to Electrochemical Mechanism

“…These results were later confirmed by a powder and single crystal XRD characterization by Weber and co‐workers Posteriory, Dahn et al attributed presence of Si–O–Si groups to the siloxene oxidation into a glassy SiO 2 by exposure to air and moisture, this crosslinking is intensified by thermal annealing >300 °C leading to decomposition into SiO 2 . Finally, Yamanaka and co‐workers synthesized layered polysilane (Si 6 H 6 ) by topotactic reaction of CaSi 2 at −30 °C with no hydrogen evolution, reactions carried out at higher temperatures resulted in oxidized siloxenes. The polysilane has a considerable amount of highly reactive dandling bonds, thus it is extremely reactive and complicated to handle .…”

Mechanochemical lithiation of layered polysilane

“…Si 6 H 6 showed a strong absorption band at the UV region with an edge at 576 nm, indicating that bandgap energy is 2.2 eV, which is in good agreement with previously published results. 22 On the other hand, the absorption band edge of Si 6 Li 6 was shifted to a longer wavelength and showed lower bandgap energy (0.85 eV) than that of Si 6 H 6 . Si 6 H 6 /3Li showed that two absorption edges attributed to bandgaps of 0.85 and 2.2 eV, suggesting that both Si 6 H 6 and Si 6 Li 6 -like moieties coexist in the composite due to the inhomogeneous distribution of Li in Si 6 H 6 /3Li.…”