Перегляд за Автор "Ulug, B."

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  • Ескіз
    Документ
    Investigation of tin containing organic complexes for the production of nanosized tin dioxide films
    (2010) Hrinevych, Viktor S.; Savin, Serhii M.; Smyntyna, Valentyn A.; Filevska, Liudmila M.; Ulug, B.; Turkdemir, M. Haluk; Ulug, A.; Yaltkaya, S.
    Thin films adsorptive sensitive elements based on oxide materials with nananosised grains found wide spread application in modern gas analyzers. Tin dioxide is one of such materials which have good sensitivity to some gases and chemically resistivity to some harmful and poisoning gases. Thus, investigation of the production processes of nanosized oxide materials layers, i.e. tin dioxide, is appeared to be important.
  • Ескіз недоступний
    Документ
    Optical constants detection in tin dioxide nano-size layers by surface plasmon resonance investigation
    (2011) Serdeha, B. K.; Matiash, I. E.; Maksymenko, L. S.; Rudenko, S. P.; Smyntyna, Valentyn A.; Hrinevych, Viktor S.; Filevska, Liudmila M.; Ulug, B.; Ulug, A.; Yucel, B. M.
    Optical constants of tin dioxide nano-size layers were detected using surface plasmons resonance research technique. Squared reflectance indexes difference as well as the ones with s- and p-polarized light are measured simultaneously. Obtained in the work the refraction coefficient of the tin dioxide film gives the possibility to judge about the structural perfection of the layer and confirms that the film has significant porosity, which is created during the decomposition of the polymer materials used as structuring additives. It is shown that the resonance condition for surface plasmons may be destroyed through the interaction of surface plasmons with surface roughness potential of the film (medium dielectric properties variation).
  • Ескіз
    Документ
    Structure, spectroscopic and thermal characterization of bis(acetylacetonato)dichlorotin(IV) synthesized in aqueous solution
    (2010) Ulug, B.; Turkdemir, M. Haluk; Ulug, A.; Buyukgungor, O.; Yucel, M. B.; Smyntyna, Valentyn A.; Hrinevych, Viktor S.; Filevska, Liudmila M.
    Bis(acetylacetonato)dichlorotin(IV) is synthesized from the aqueous solutions of tin(IV) chloride and acetylacetone followed by vacuum drying at room temperature. DTA/TGA, FTIR, UV-VIS, X-ray powder and single crystal, mass spectra and elemental analysis are performed to characterize the product. X-ray powder diffraction suggests that the sample may contain some impurities such as SnO, SnO2 and Sn2O3 while the mass spectra indicates the existence of Sn(acac)4, which is arguable due to the steric effect. Single crystal investigation reveals that the product synthesized in aqueous solution is Sn(acac)2Cl2, crystallized in monoclinic system in space group C2/c with unit cell constants a=13.983(2), b=7.8928(8), c=13.7889(19) Ao and b=107.601(11)o, whose volume is 1.43 % smaller than the one synthesized in dry toluene.
  • Ескіз
    Документ
    The temperature dependent studies of Luminescent in nanosized SnO2 films
    (2017) Hrinevych, Viktor S.; Filevska, Liudmila M.; Smyntyna, Valentyn A.; Ulug, B.
    Tin dioxide, widely used in various electronics industries, is not a luminophore material, however, the luminescence of crystalline dioxide at low temperatures is described in the literature [1]. Nanoscale forms of this material liave recently been increasingly described as luminescent, which expands the possibilities of its use [2]. The paper presents the results of temperature studies of the luminescence of nanoscale tin dioxide films obtained by a sol-gel method using polymers in the 9-300 К range. SnOj films obtained using polymers exhibited photoluminescence at room temperature in the orange-red region of the spectrum. Two peaks are observed in the photoluminescence spectra: the first in the region 1.85-1.9 eV and the second in the region o f 2.32 eV. Apparently, the peak at 647 nm (1.9 eV) is associated with oxygen vacancies in the samples studied, and in the region of 2.32 eV with excess tin. The temperature dependences of the peak energy, their intensity and lialf-width are considered. The temperature dependences show a significant decrease in the luminescence intensity of the peaks with increasing temperature. The observed effect is explained by the temperature quenching of luminescence as a result of nonradiative recombination. This is a consequence of the existence of a significant density of electron states at the edges of the forbidden band, specific for in dioxide, especially for nanoscale thin films with a significant disruption o f long-range order.
  • Ескіз
    Документ
    Thermogravimetric Study of Nano-SnO2 Precursors
    (2017) Hrinevych, Viktor S.; Filevska, Liudmila M.; Savin, Serhii M.; Smyntyna, Valentyn A.; Ulug, B.
    Adsorption-sensitive thin film elements on the basis of nanoscale oxide materials, especially nanoscale tin dioxide, are widely used in the modern gas analyzers. Wellknown production methods of nanoscale metal oxide like tin dioxide are liquid phase chemical methods: sol-gel method, chemical solution deposition, chemical vapor deposition, etc. [1–3]. One of the main stages in such technologies is the decomposition of one, thermally unstable, compound to produce tin dioxide as the final product. The production of such compounds is limited enough. The limited and contradictory literature data on their physical and chemical properties determined the necessity to find a suitable precursor for nanosized tin dioxide production. Previously, authors [4] by means of the method of chemical precipitation from solution proposed the preparation technique for SnO2 film production with polyvinyl acetate (PVA) as a structuring additive. The complex bis(acetylacetonato)dichlorotin (BADCT) was used as a precursor of tin dioxide. In [5], it was firstly mentioned the fact of obtaining of BADCT (Sn(C5H7O2)2Cl2) in 1903. Earlier in the literature [5–8], it was reported the BADCT production using chloroform [5] or dry toluene [8] as solvents. A special feature of our method is using of water as a solvent.
  • Ескіз
    Документ
    Термогравиметрические исследования комплексов прекурсора для получения наноразмерных пленок двуокиси олова
    (Астропринт, 2011) Гриневич, В. С.; Смынтына, Валентин Андреевич; Савин, С. Н.; Филевская, Л. Н.; Улуг, Б.; Халук Туркдемир, М.; Улуг, А.; Ялткая, С.; Гріневич, В. С.; Сминтина, Валентин Андрійович; Савін, С. М.; Філевська, Л. М.; Улуг, Б.; Халук Туркдемір, М.; Улуг, А.; Ялткая, С.; Grinevich, V. S.; Savin, S. N.; Smyntyna, Valentyn A.; Filevska, Liudmyla M.; Ulug, B.; Haluk, Turkdemir, M.; Ulug, A.; Yaltkaya, S.
    В работе представлены результаты термогравиметрических исследований двух комплексов прекурсора двуокиси олова для чувствительных элементов сенсоров,позволившие установить и сопоставить основные этапы их термического разложения. Различия в процессах разложения комплексов обусловлены различиями в их составе, а именно, в наличии (в комплексе № 1) или отсутствии (в комплексе № 2) молекул координированной воды. При термическом разложении комплекса вода в его составе выполняет функцию его разрыхления, что позволяет получать пленки двуокиси олова с наноразмерными зернами.