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Wyświetlanie 1-6 z 6
Tytuł:
Structural and Spectral Properties of 1,2-dihydroxy-9,10-anthraquinone Dye Sensitizer for Solar Cell Applications
Autorzy:
Ranjitha, S.
Aroulmoji, V.
Mohr, T.
Anbarasan, P.
Rajarajan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1205296.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.40.H-
31.10.+Z
71.15.Mb
31.15.ae
Opis:
The geometries, electronic structures, polarizabilities, and hyperpolarizabilities of natural dye sensitizer alizarin from madder fruit was studied based on density functional theory using the hybrid functional B3LYP. Features of the electronic absorption spectra in the visible and near-UV regions were assigned based on time-dependent density function theory calculations. The calculated results suggest three excited states with the lowest excited energies in 1,2-dihydroxy-9,10-anthraquinone and it was due to photoinduced electron transfer processes. The interfacial electron transfer between semiconductor $TiO_2$ electrode and dye sensitizer 1,2-dihydroxy-9,10-anthraquinone is due to an electron injection process from excited dye to the semiconductor conduction band. The importance of hydroxyl group in geometries, electronic structures and spectral properties were reported.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 833-839
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First Principles Study of Gas Adsorption Dynamics on Pristine and Defected Graphene
Autorzy:
Wlazło, M.
Majewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398540.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.E-
61.48.Gh
68.43.-h
Opis:
We present the results of ab initio calculations of gas adsorption processes on graphene. Static density functional theory framework is used to obtain adsorption energies of several species on a Stone-Wales defected graphene monolayer. The Van der Waals interaction is taken into account by a semi-empirical correction. Sites closer to the defect are found to induce stronger adsorption compared to sites further away, where the graphene crystal structure is intact. The Car-Parrinello ab initio molecular dynamics simulations are performed at high temperatures. CH₃ is found to be stably physisorbed or chemisorbed at 300 K.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-142-A-144
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Semiempirical Method for Finding Thermal Characteristics of Simple Crystals
Autorzy:
Scharoch, P.
Powiązania:
https://bibliotekanauki.pl/articles/2038377.pdf
Data publikacji:
2004-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.40.-b
64.10.+h
31.15.Ar
Opis:
A method for ab initio (using density functional theory) study of thermal properties of crystalline solids, based on the quasiharmonic approximation, is briefly summarized. On that basis the semiempirical method is proposed which combines the ab initio calculation of the static total energy with the Einstein model of crystal vibration. The Murnaghan equation of states is used as an analytical model for the static total energy. An exponential form of the phonon energy versus volume dependence is introduced which was proved to perform very well. Two parameters appearing in the model are found by fitting to easily available experimental data (tabular or measured). The method then provides thermodynamic characteristics in a large range of temperatures and pressures. On the other hand, the corrections due to the zero-point vibration are provided to some first principles results, like lattice parameters or bulk modulus. An interesting outcome of the model is the pressure dependence of the overheating temperature, for relatively low pressures. Tests performed on the example of fcc aluminum show remarkably good agreement of the results with experimental data. Therefore the method offers a handy tool for fast analysis of thermodynamics of simple crystalline systems, omitting the first principles evaluation of the phonon energies.
Źródło:
Acta Physica Polonica A; 2004, 106, 4; 487-495
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Benzene on 4H-SiC (0001) Surface: First Principles Calculations
Autorzy:
Tokár, K.
Majewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1403649.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.43.-h
73.20.-r
77.84.Jd
31.15.A-
Opis:
We study adsorption of the benzene molecule on the Si terminated (0001) surface of 4H-SiC by performing first principles calculations in the framework of density functional theory. We find out that chemical reaction leading to the chemisorption of benzene on the surface has endothermic character. The adsorbed benzene molecule is bounded to two surface Si atoms and it does not lose its integrity, however, it undergoes strong deformations and causes distortion of the substrate. We analyze also changes in the electronic structure caused by benzene adsorption.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1049-1051
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Transfer and Up-Conversion in the Erbium Elpasolites Cs$\text{}_{2}$NaEr$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$
Autorzy:
Campbell, M.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945497.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
13.40.Hq
31.70.Hq
34.30.+h
61.72.Ss
78.55.Hx
Opis:
The luminescence decay curves from the $\text{}^{4}$F $\text{}_{9}\text{}_{/}\text{}_{2}$ and $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ states of the cubic hexachloroelpasolite crystals Cs$\text{}_{2}$NaEr$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ (x = 0.001÷1) have been measured over the temperature range 10-300 K. The $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ state undergoes an electric dipole vibronic-electric dipole vibronic cross-relaxation process at 300 K, but this mechanism is inefficient below 165 K. Excitation into the $\text{}^{4}$F $\text{}_{9}\text{}_{/}\text{}_{2}$ state, results in emission in the green, blue and ultra violet regions. The up-conversion processes which could account for the ultraviolet emission are discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 151-160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Electron Theory of Sintering to the Ferrite Systems
Autorzy:
Kopayev, A.
Bushkova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1549694.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.10.+z
36.20.Hb
66.30.-h
77.84.Bw
81.20.Ev
85.70.Ge
Opis:
The compositions of magnesium-zinc ferrites $(Mg_{0.56}Zn_{0.44})_{1-y}Fe_{2 + 2y/3}O_{4}$, where y = -0.05, 0, +0.05 were sintered at temperatures 1230 and 1280°C. The analysis of the kinetics of sintering was carried out by using the Ivensen model. It was shown that at decrease of y the sintering rate increases. The analysis of the electronic configurations of the cations in the ferrite composition showed the possibility of applying the Samsonov electronic theory of sintering powders to them. Magnetic permeability of the studied chemical compositions increases with increase of the density of ferrites as well as with the temperature and the time of isothermal soaking.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 30-33
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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