Publications (5)3.43 Total impact
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Article: Spectral properties of organosilicon polymer/SiO2 porous film nanocomposite films
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ABSTRACT: Nanocomposite films based on an organosilicon polymer, poly(di-n-hexylsilane) (PDHS), introduced into SiO2 film pores were prepared by a method developed herein. The dependences of optical spectra of the composites on both the polymer concentration within the porous silica films and temperature variations in the range 15–310 K have been studied. A comparison of spectra of the prepared films and PDHS/SBA-15 porous silica nanocomposites that were studied previously revealed the coexistence in the films of three spatially independent polymer photoluminescence centers corresponding to isolated polymer chains in trans- and gaucheconformations and their aggregates. The strongest band in the photoluminescence spectrum of the nanocomposite films belongs to PDHS aggregates. Its intensity exhibits an extraordinary increase as the temperature rises from 260 K to 310 K. This is supposedly associated with the additional formation of aggregates during the trans×gauche thermochromic transition. Keywordsnanocomposites–poly(di-n-hexylsilane)–SiO2 mesoporous films–optical spectraJournal of Applied Spectroscopy 05/2012; 78(1):75-80. · 0.51 Impact Factor -
Article: Spectroscopy of Nano-Sized Polysilanes Confined by Different Structures of Silica
Molecular Crystals and Liquid Crystals. 01/2011; 536(1):41/[273]-49/[281]. -
Article: Temperature independent exciton relaxation in poly(di-n-hexylsilane) confined in nanoporous silica
Chemical Physics Letters 01/2008; 465(4-6):261. · 2.34 Impact Factor -
Article: Coexistence of Different Conformer Forms in Nanosize Poly(di-n-hexylsilane)
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ABSTRACT: Photoluminescence and photoluminescence excitation spectra of poly(di-n-hexylsilane) (PDHS) embedded in nanoporous silica material SBA-15 with a pore diameter of 10 nm were analyzed at different temperatures ranging from 5 to 320 K. The optical spectra of this composite are structured containing three bands, attributed to different structural forms of the polymer coexisting in a restricted pore volume: the polymer chains in the trans and gauche conformations, and their aggregates. Different structural forms are spatially separated and weakly coupled; therefore, several bands are distinguished in the photoluminescence spectra at low temperatures when several forms coexist. For the first time two termochromic transitions of nanosize PDHS were observed at about 265 and 320 K for a single polymer chain and for aggregates, respectively.03/2007; -
Article: Luminescence Kinetics of Nanosize Poly(di-n-hexyl)Silane Embedded in Nanoporous Silica
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ABSTRACT: Excited state relaxation kinetics of nanostructured poly(di-n-hexyl)silane embedded in nanoporous silica SBA-15 with the pore size of 10 nm was considered with the nanosecond and picosecond time resolution by using photomultiplier with fast response time and by means of time correlated two-pulse excitation. Measurements were carried out at room temperature. For comparative reasons the exciton relaxation kinetics of poly(di-n-hexyl)silane films are also considered. It was found that the photoluminescence of nanostructured poly(di-n-hexyl)silane decays exponentially with about 6 ns time constant, which is more than 10 times longer than that of the film. The longer decay time should be related with slower exciton diffusion and lower density of exciton quenching centers.Molecular Crystals and Liquid Crystals 01/2007; 468(July 01):327/[679]-334/[686]. · 0.58 Impact Factor
