Abstract
Structural confinement effects of amorphous ternary chalcogenide of Ni3(SbTe3)2 in mesoporous channels of different pore diameters have been studied. Insertion of the guest into the channels of AlMCM-41 was probed by the results of transmission electron microscopy (TEM), nitrogen adsorption, X-ray diffraction (XRD), and photoluminescence (PL) and photoluminescence excitation (PLE). From powder XRD patterns, characteristic diffraction peaks were observed for the ternary chalcogenide incorporated in AlMCM-41, which indicated long-range ordering and increased crystallinity. The competition between the homogeneous broadening and the inhomogeneous broadening of the characteristic XRD peak profiles of the guest chalcogenides are evaluated in a series of the hosts. As the mesopore diameter decreases, the strain is enlarged in the nanosize guest chalcogenide while the estimated particle size from the full width at half-maximum (fwhm) of the respective Lorentzian profiles is similarly preserved. The characteristic energy level, for the nanophase ternary chalcogenide, induced by the strain is gradually red shifted in the nanocomposites with decreasing the pore diameter. The structural confinement causes the suppression of phonon coupling to the photoexcited carriers in the ternary chalcogenide incorporated in AlMCM-41, and the coupling is more suppressed in the nanocomposite of smaller pore diameter. Such phonon suppression induced by the structural confinement results in longer PL lifetimes as the pore diameter decreases.
| Original language | English |
|---|---|
| Pages (from-to) | 1585-1591 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry B |
| Volume | 107 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2003 Feb 20 |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry
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Structural confinement effects of ternary chalcogenide in mesoporous ALMCM-41 of different pore diameters. / Chae, Weon Sik; Kim, Yong Rok; Jung, Jin Seung.
In: Journal of Physical Chemistry B, Vol. 107, No. 7, 20.02.2003, p. 1585-1591.Research output: Contribution to journal › Article
TY - JOUR
T1 - Structural confinement effects of ternary chalcogenide in mesoporous ALMCM-41 of different pore diameters
AU - Chae, Weon Sik
AU - Kim, Yong Rok
AU - Jung, Jin Seung
PY - 2003/2/20
Y1 - 2003/2/20
N2 - Structural confinement effects of amorphous ternary chalcogenide of Ni3(SbTe3)2 in mesoporous channels of different pore diameters have been studied. Insertion of the guest into the channels of AlMCM-41 was probed by the results of transmission electron microscopy (TEM), nitrogen adsorption, X-ray diffraction (XRD), and photoluminescence (PL) and photoluminescence excitation (PLE). From powder XRD patterns, characteristic diffraction peaks were observed for the ternary chalcogenide incorporated in AlMCM-41, which indicated long-range ordering and increased crystallinity. The competition between the homogeneous broadening and the inhomogeneous broadening of the characteristic XRD peak profiles of the guest chalcogenides are evaluated in a series of the hosts. As the mesopore diameter decreases, the strain is enlarged in the nanosize guest chalcogenide while the estimated particle size from the full width at half-maximum (fwhm) of the respective Lorentzian profiles is similarly preserved. The characteristic energy level, for the nanophase ternary chalcogenide, induced by the strain is gradually red shifted in the nanocomposites with decreasing the pore diameter. The structural confinement causes the suppression of phonon coupling to the photoexcited carriers in the ternary chalcogenide incorporated in AlMCM-41, and the coupling is more suppressed in the nanocomposite of smaller pore diameter. Such phonon suppression induced by the structural confinement results in longer PL lifetimes as the pore diameter decreases.
AB - Structural confinement effects of amorphous ternary chalcogenide of Ni3(SbTe3)2 in mesoporous channels of different pore diameters have been studied. Insertion of the guest into the channels of AlMCM-41 was probed by the results of transmission electron microscopy (TEM), nitrogen adsorption, X-ray diffraction (XRD), and photoluminescence (PL) and photoluminescence excitation (PLE). From powder XRD patterns, characteristic diffraction peaks were observed for the ternary chalcogenide incorporated in AlMCM-41, which indicated long-range ordering and increased crystallinity. The competition between the homogeneous broadening and the inhomogeneous broadening of the characteristic XRD peak profiles of the guest chalcogenides are evaluated in a series of the hosts. As the mesopore diameter decreases, the strain is enlarged in the nanosize guest chalcogenide while the estimated particle size from the full width at half-maximum (fwhm) of the respective Lorentzian profiles is similarly preserved. The characteristic energy level, for the nanophase ternary chalcogenide, induced by the strain is gradually red shifted in the nanocomposites with decreasing the pore diameter. The structural confinement causes the suppression of phonon coupling to the photoexcited carriers in the ternary chalcogenide incorporated in AlMCM-41, and the coupling is more suppressed in the nanocomposite of smaller pore diameter. Such phonon suppression induced by the structural confinement results in longer PL lifetimes as the pore diameter decreases.
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U2 - 10.1021/jp020893c
DO - 10.1021/jp020893c
M3 - Article
AN - SCOPUS:0037456387
VL - 107
SP - 1585
EP - 1591
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 7
ER -