Publications on the project |
033 Optoelectronic Properties and Molecular Ordering of Tetracene Thin Layers on Gold |
Authors: | R.D. Fedorovich, V.B. Nechytaylo, L.V. Viduta, T.A. Gavrilko, A.A. Marchenko, A.G. Naumovets, A.I. Senenko, P.V. Shabatyn, J. Baran
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Summary: | Fourier transform infrared (FTIR) spectroscopy and scanning tunneling microscopy (STM) were used to study the molecular organization and morphology of vacuum-deposited tetracene layers. FTIR and optical measurements confirm that tetracene molecules are not dissociated during vacuum thermal deposition. With STM imaging, a highly ordered, closely packed, lamella-like structure of tetracene monolayer film on the Au(111) surface was observed. Electroluminescence from the nanocomposite consisting of Au nanoparticles and tetracene film is concentrated within submicron luminescent centers and occurs at voltages of 4–5 V in a superlinear section of conduction current–voltage curves. The results can be useful for the design of planar light-emitting devices. | |
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Edition: | Spectroscopy Letters | | | 2012,
372-377,English |
033 Structure and electroluminescent properties of thin tetracene layers on gold island films. |
Authors: | L. Viduta, T. Gavrilko, A. Marchenko, V. Nechytaylo, A. Senenko, R. Fedorovich, P. Shabatyn | |
Summary: | The molecular structure, morphology, and electrical
conductivity of thin tetracene layers obtained by the
thermal vacuum deposition have been studied with the
help of FTIR spectroscopy and STM/STS techniques as
well. It has been shown that this preparation method
does not change the tetracene molecular structure.
The tetracene thin layers on the atomically smooth
pyrolytic graphite surface demonstrate an amorphous
structure. The local current-voltage characteristics
(CVC) measured for tetracene films 10 monolayers
thick show a well-defined asymmetry relative to a tunnel
voltage.
A study of the electrical conductivity and the
electroluminescence (EL) of a planar composite
consisting of gold island films and tetracene layers has
revealed that EL from submicron luminescent centers is
observed on a superlinear section of conduction current
I–V curves. The EL intensity grows with increasing
voltage and becomes maximal at the CVC saturation.
It is found that the EL from the nanocomposite has a
560-nm wavelength emission maximum. | |
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Edition: | Ukrainian Journal of Physics | | | 2012,
260-265,English |
033 033 Structure and electrochemical properties of aqueous suspensions of single- and multi-walled carbon nanotubes |
Authors: | U. Ritter, N.Tsierkezos, Yu. Prylutskyy, V. Cherepanov, A. Senenko, A. Marchenko, A. Naumovets | |
Summary: | The structure of single- and multiwalled carbon nanotubes (CNTs) functionalized with carboxyl groups in water is investigated by means of atomic force microscopy. The electrochemical properties of the water systems containing both types of CNTs are investigated, by using the cyclic voltammetry and electrochemical impedance spectroscopy techniques. The results may be useful for the clarification of the mechanisms of specific biological activities of CNTs and their applications in various fields of nanobiotechnology.
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Edition: | Ukrainian Journal of Physics | | | 2014,
433-438,English |
033 033 One-dimensional array of point-like light sources based on gold nanoparticles and tetracene: Preparation and possible operation mechanisms |
Authors: | V.V. Cherepanov, R.D. Fedorovich, O.E. Kiyayev, A.G. Naumovets, V.B. Nechytaylo, P.M. Tomchuk, and L.V. Viduta, | |
Summary: | A method of preparation of a linear close-packed array of point-like light sources based on a nanocomposite of gold nanoparticles and tetracene is proposed. Ordered system of microleads to the light sources with packing density up to 1000 mm−1 consists of linear conducting chains of cobalt nanoparticles self-assembled in a magnetic field. The electroluminescence from the gold-tetracene nanocomposite occurs in the visible range typical of organic light-emitting field-effect transistors based on tetracene. A theoretical substantiation of the possibility of excitation of tetracene molecules by hot electrons emitted from the gold nanoparticles is suggested and compared with other possible physical mechanisms. | |
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Edition: | Applied Physics Letters | | | 2014,
193302-1 – 193302-5,English |
The events in the framework of the project |
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033 Executant:Institute of Physics, Department of Physics and Astronomy, Section Physical, Engineering and Mathematics 1.4. Diagnostics and modeling of nanosystems Purpose:The development of methods of formation of ordered nanostructures based on organic monolayers, elaboration of regularity of ordering of organic molecules on the atomic smooth substrates, the study of electronic and emission properties of created nanostructures Expected results:Release of new product: technology Stage 1:- Stage 2:- Stage 3:The development and improvement of experimental techniques to obtain physical adsorbed and chemisorbed molecular monolayers based on derivatives of long-chain aliphatic molecules, liquid crystal molecules and aromatic compounds. Stage 4:Research of structures of monolayers of derivatives of long-chain aliphatic molecules, liquid crystals and aromatic compounds by means of scanning probe methods (STM and AFM) Stage 5:Creation of measurement procedures current-voltage and illumino-voltage characteristics of organic nanostructures. STM study of the mechanisms of charge transport in ordered ensembles based on long-chain compounds and aromatic liquid crystal molecules.
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