TY - JOUR

T1 - Nano-channel anisotropic optical material containing ∼5 nm diameter aligned Se nanowires with enhanced photo-structural effects and unique photonic, electronic, phononic and thermal properties

AU - Poborchii, Vladimir V.

AU - Sachkov, Victor A.

AU - Shklyaev, Alexander A.

AU - Geshev, Pavel I.

N1 - We thank V.N. Bogomolov, V.P. Petranovskii and Y.A. Kumzerov for providing natural bare chrysotile asbestos samples, V.V. Zhuravlev for assistance in the asb-Se sample fabrication, O. Terasaki and N. Ohnishi for the high-resolution TEM observation of bare asbestos nanotubes. The work was partially supported by the Russian Science Foundation (Grant # 19–72–30023). DFT calculations were conducted under the government order for Omsk Scientific Center SB RAS (project registration number 121021600004-7).

PY - 2026/1

Y1 - 2026/1

N2 - We studied polarized optical absorption and Raman spectra (OAS and RS) of ∼5-nm-diameter Se nanowires (NWs) confined in chrysotile asbestos nanotubes packed parallel to each other. Se was encapsulated into the asbestos nanotubes from the melt using ∼5 kbar pressure. Asbestos with Se NWs (asb-Se) shows a high OAS and RS anisotropy with strong NW-light interaction for the light polarized parallel to NWs. Se/asbestos dielectric contrast and Mie-resonance-assisted local electric field enhancement contribute to this effect. Strong asb-Se NW Raman signal and photo-structural effect acceleration, observed here, are related to this enhancement. Asb-Se NW OAS show electron energy bandgap enlargement of ∼0.2 eV while RS display radial breathing modes at ∼12 cm-1 and ∼29 cm-1 due to the electron and acoustic-phonon confinement, respectively. Asb-Se NW optical-phonon RS with fine structure is associated with a t-Se-like core and a shell with weaker interacting Se chains, displaying higher frequencies. We observe melting point depression of asb-Se NWs with the shell and core melting temperatures

AB - We studied polarized optical absorption and Raman spectra (OAS and RS) of ∼5-nm-diameter Se nanowires (NWs) confined in chrysotile asbestos nanotubes packed parallel to each other. Se was encapsulated into the asbestos nanotubes from the melt using ∼5 kbar pressure. Asbestos with Se NWs (asb-Se) shows a high OAS and RS anisotropy with strong NW-light interaction for the light polarized parallel to NWs. Se/asbestos dielectric contrast and Mie-resonance-assisted local electric field enhancement contribute to this effect. Strong asb-Se NW Raman signal and photo-structural effect acceleration, observed here, are related to this enhancement. Asb-Se NW OAS show electron energy bandgap enlargement of ∼0.2 eV while RS display radial breathing modes at ∼12 cm-1 and ∼29 cm-1 due to the electron and acoustic-phonon confinement, respectively. Asb-Se NW optical-phonon RS with fine structure is associated with a t-Se-like core and a shell with weaker interacting Se chains, displaying higher frequencies. We observe melting point depression of asb-Se NWs with the shell and core melting temperatures

KW - Chrysotile asbestos

KW - Photo-structural effects

KW - Photonics

KW - Raman spectra

KW - Se nanowires

UR - https://www.scopus.com/pages/publications/105022796989

UR - https://www.mendeley.com/catalogue/92649221-e391-3a7f-a169-42c7deded7d6/

U2 - 10.1016/j.optmat.2025.117712

DO - 10.1016/j.optmat.2025.117712

M3 - Article

VL - 169

JO - Optical Materials

JF - Optical Materials

SN - 0925-3467

M1 - 117712

ER -