An experimental setup has been created for scanning the integral light sum of X-ray luminescence IS = f(X) and X-ray luminescence spectrum IXRL = f(hν); the time dependence of integral tunnel luminescence ITL = f(τ) and its spectral composition TL = f(hν); the temperature dependence of integral thermally stimulated luminescence ITSL = f(T) and its spectral composition ITSL = f(hν); and the spectrum of “flash” IF = f(hν) and optical stimulation of “flash” IFOS = f(hν), irradiated with X-rays and uniaxially deformed along the crystallographic directions 〈100〉 or 〈110〉 at low temperature (85 K).

Photo-induced change of the electrical properties of diarylethenes in nanocomposites/ G.T. Vasilyuk [ и др.] // Book of abstracts : the 4th International symposium 'Molecular photonics' dedicated to academician A.N. Terenin, Peterhof, St. Petersburg, July 21-24, 2016.- Санкт-Петербург : [Б. и.], 2016 .- С.73 Статья

Methods of fabrication of solid-phase composite Ag- and Au-containing nanostructured systems with a shell of photochromic diarylethenes molecules (DAE) have been developed. The samples of nanocomposite systems were obtained. These nanocomposites exhibit photochromic properties similar to the properties of DAE in solution and solid-phase layers not containing metal nanoparticles. A chemical interaction between nanoparticles and sulfur-containing derivatives of DAE in solid-phase nanocomposites was detected.

Methods for fabricating solid-state Ag- and Au-containing nanostructured composites with shells of photochromic diarylethenes (DAEs) were developed. The obtained nanocomposites exhibited photochromic properties similar to photochromic transformations of DAEs in solutions and solid-state layers without metal nanoparticles. Chemical interaction between the nanoparticles and S-containing DAE derivatives were detected in the solid-state nanocomposites.

Physics, Chemistry and Applications of Nanostructures, pp. 80-83 (2015) No AccessSNOM VISUALISATION OF LIGHT-TRIGGERED SWITCHING IN PHOTOCHROMIC MATERIALSD. S. FILIMONENKO, V. M. YASINSKII, G. T. VASILYUK, S. A. MASKEVICH, A. E. GERMAN, V. F. OSKIRKO, B. S. LUKYANOV, and V. I. MINKIND. S. FILIMONENKOB.I. Stepanov Institute of Physics NASB, Nezavisimosti Ave. 68, 220072 Minsk, Belarus, V. M. YASINSKIIB.I. Stepanov Institute of Physics NASB, Nezavisimosti Ave. 68, 220072 Minsk, Belarus, G. T. VASILYUKYanka Kupala State University, Ozheshko 22, 230023 Grodno, Belarus, S. A. MASKEVICHYanka Kupala State University, Ozheshko 22, 230023 Grodno, Belarus, A. E. GERMANYanka Kupala State University, Ozheshko 22, 230023 Grodno, Belarus, V. F. OSKIRKOYanka Kupala State University, Ozheshko 22, 230023 Grodno, Belarus, B. S. LUKYANOVInstitute of Physical and Organic Chemistry, Southern Federal University 344090 Rostov-on-Don, Russia, and V. I. MINKINInstitute of Physical and Organic Chemistry, Southern Federal University 344090 Rostov-on-Don, Russiahttps://doi.org/10.1142/9789814696524_0020Cited by:0 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: Optical properties of hybrid nanostructured systems "metal nanoparticle-photochromic molecule" were studied using scanning near-field optical microscopy (SNOM). The reversibility of photochromic reactions was demonstrated. From the result obtained it may be inferred that SNOM is a useful tool in studying the local switching of photochromic molecules, and it has much potential for nanomachining of nanoscale structures and optical elements. FiguresReferencesRelatedDetails Physics, Chemistry and Applications of NanostructuresMetrics History PDF download

Ранее нами было показано, что спиропираны, содержащие формильные группы в [2Н]-хроменовом фрагменте молекулы, проявляют фотохромные свойства в твердой фазе в тонких пленках, полученных в результате вакуумного термического напыления на кварцевые или стеклянные поверхности. В продолжение исследований в данной работе были изучены структурные и оптические свойства оригинальных гибридных наноструктурированных систем «металлическая наночастица – фотохромные спироциклические молекулы». Морфологие этих систем изучена методами атомно-силовой микроскопии (АСМ), что дало возможность установить гранулированную структуру кластеров серебра, а также особенности превращений таких фотохромных молекул в различных матрицах. Установлено, что данные наноструктурированные системы являются эффективными субстратами, вызывающими усиление сигнала КР света и позволяющими наблюдать фотохромные превращения молекул спиропиранов вблизи поверхности металла. Колебательные частоты основных полос спектров ГКР соотнесены с соответствующими связями в молекулах исследованных соединений экспериментально и с помощью квантовохимических расчетов.

Plasmon films of noble metals (gold PGF and silver PSF) evaporated onto quartz in vacuum shows possibility of selective exciting of fluorescence or SERS of molecules. We discovered plasmon-assisted fluorescence from PGF versus surface enhanced fluorescence from PSF.

The growth of gold island films under vacuum deposition on the surface of dielectric substrates are investigated. Fractal dimensions of the clusters formed under film deposition at different substrate temperatures and evaporation rates are estimated. The correlation between surface morphology and optical properties of the films deposited are discussed.

The specifics of photochromic transformations of spirocyclic molecules at the nanostructured metal surface were studied by hyper-Raman spectroscopy (HRS) and spectrophotometry. Unique nanostructured systems were prepared, and their surface morphology and optical properties were examined. Enhancement of the photochromic transformations near the nanostructured metal surface was revealed. HRS spectra for various classes of spirocyclic compounds adsorbed on nanostructured systems of different types (granular silver films, AgCl-Ag films) were measured. The bands due to in-plane vibrations have the highest intensity, thereby indicating preferred planar geometry of adsorption of the test molecules.

We have investigated the giant Raman scattering spectra of the doxorubicin–DNA complex adsorbed on the surface of annealed thin silver films modified by sodium chloride. It is found that doxorubicin interacts with DNA via carbon groups with involvement of their π‐electron system into interaction. Heating of a substrate in the process of adsorption from 20 to 37°C leads to a sharp increase in the number of chemisorbed molecules as a result of the thermally activated formation of specific adsorption sites. It has been found that in adsorption of the doxorubicin–DNA complex on the substrate surface, the chromophore molecules are oriented predominantly in parallel with the surface of the metal.

This work presents some aspects of surface-enhanced spectroscopy application to the study of intermolecular interactions of antitumor drugs with microenvironment in compound molecular systems. The surface-enhanced fluorescence (SEF) spectra and the surface-enhanced resonance Raman scattering (SERRS) spectra of doxorubicin (DOX) adsorbed on silver films (SF), annealed silver films (ASF) and chemically modified ASF are exposed and compared with corresponding spectra of DOX in water solution and on silver sols. The existence of complicated dependencies for both (SERRS and SEF) components of surface-enhanced secondary emission of DOX on ASF on optical and chemical properties of used films are discussed. Changes detectable in SERRS spectra of DOX at transition from solutions to sols, from sols to SF and further to ASF and chemically modified ASF are also discussed and considered as a result of a change in number and/or activity of specific adsorption sites on silver surface. These spectral changes are very similar to those in resonance Raman (RR) spectra of intercalated complex of DOX with DNA and in RR spectra of aclacinomicin. The breakage of intramolecular hydrogen bonds and effects of changing of chromophore moiety local symmetry of DOX are considered.

We have studied the effect of the long-range amplification of secondary radiation of the molecules of oxazine 1 adsorbed on the surface of thin silver film covered by 1–7 Langmuir monolayers of stearic acid. We show that the intensity of the giant Raman scattering (GRS) changes proportionally to r−1 with removal of a molecule from the surface of a metal, which is in good agreement with the theory. The distances over which the strength of the electric field enhanced by the surface makes a substantial contribution to the processes mentioned are of the order of 10 nm.

The influence of chemisorption and intermolecular Van der Waals interactions on the formation of surface-enhanced Raman spectra of 1-propanethiol and 3-mercaptopropionic acid coated as self-organized monolayers on vacuum-deposited thin silver films and thin silver films annealed at high temperatures is studied. Optical properties of films of both types are found to be strongly affected by the chemical modification, which is associated with peculiarities of the monolayer formation. It is shown that the reorganization of the substrate surface can be associated with intense repulsion between alkane chains of thiol when the distance between them decreases in comparison with the distance typical of crystalline paraffins. Conclusions on the presence and the nature of packing defects of short-chain thiols on the substrate surface are made on the basis of the analysis of Raman and surface-enhanced Raman spectra. It is shown that the interaction between the first (propanethiol) and the second (pyruvate) monolayers near the silver surface in the water phase results in the reorganization of the first monolayer, in which conformers of propanethiol in the gauche-conformation with respect to the C(1)-C(2) bond prevail.

Ранее нами было показано, что спиропираны, содержащие формильные группы в [2Н]-хроменовом фрагменте молекулы, проявляют фотохромные свойства в твердой фазе в тонких пленках, полученных в ре-зультате вакуумного термического напыления на кварцевые или стеклянные поверхности. В продолжение исследований в данной работе были изучены структурные и оптические свойства оригинальных гибридных наноструктурированных систем «металлическая наночастица – фотохромные спироциклические молеку-лы». Морфологие этих систем изучена методами атомно-силовой микроскопии (АСМ), что дало возмож-ность установить гранулированную структуру кластеров серебра, а также особенности превращений таких фотохромных молекул в различных матрицах. Установлено, что данные наноструктурированные системы являются эффективными субстратами, вызывающими усиление сигнала КР света и позволяющими на-блюдать фотохромные превращения молекул спиропиранов вблизи поверхности металла. Колебательные частоты основных полос спектров ГКР соотнесены с соответствующими связями в молекулах исследован-ных соединений экспериментально и с помощью квантовохимических расчетов.Ключевые слова