TY - JOUR
T1 - Electrical and optical properties of thermally-evaporated thin films from A 2 [TiO(C 2 O 4 ) 2 ] (A = K, PPh 4 ) and 1,8-dihydroxyanthraquinone
AU - Carbia-Ruelas, E.
AU - Sánchez-Vergara, M. E.
AU - García-Montalvo, V.
AU - Morales-Saavedra, O. G.
AU - Álvarez-Bada, J. R.
PY - 2011/2/1
Y1 - 2011/2/1
N2 - In this work, the synthesis of molecular materials formed from A 2 [TiO(C 2 O 4 ) 2 ] (A = K, PPh4) and 1,8 dihydroxyanthraquinone is reported. The synthesized materials were characterized by atomic force microscopy (AFM), infrared (IR) and ultraviolet-visible (UV-vis) spectroscopy. IR spectroscopy showed that the molecular-material thin-films, deposited by vacuum thermal evaporation, exhibit the same intra-molecular vibration modes as the starting powders, which suggests that the thermal evaporation process does not alter the initial chemical structures. Electrical transport properties were studied by dc conductivity measurements. The electrical activation energies of the complexes, which were in the range of 0.003-1.16 eV, were calculated from Arrhenius plots. Optical absorption studies in the wavelength range of 190-1090 nm at room temperature showed that the optical band gaps of the thin films were around 1.9-2.3 eV for direct transitions Eg d . The cubic NLO effects were substantially enhanced for materials synthesized from K 2 [TiO(C 2 O 4 ) 2 ], where χ (3) (-3ω; ω, ω, ω) values in the promising range of 10 -12 esu have been evaluated.
AB - In this work, the synthesis of molecular materials formed from A 2 [TiO(C 2 O 4 ) 2 ] (A = K, PPh4) and 1,8 dihydroxyanthraquinone is reported. The synthesized materials were characterized by atomic force microscopy (AFM), infrared (IR) and ultraviolet-visible (UV-vis) spectroscopy. IR spectroscopy showed that the molecular-material thin-films, deposited by vacuum thermal evaporation, exhibit the same intra-molecular vibration modes as the starting powders, which suggests that the thermal evaporation process does not alter the initial chemical structures. Electrical transport properties were studied by dc conductivity measurements. The electrical activation energies of the complexes, which were in the range of 0.003-1.16 eV, were calculated from Arrhenius plots. Optical absorption studies in the wavelength range of 190-1090 nm at room temperature showed that the optical band gaps of the thin films were around 1.9-2.3 eV for direct transitions Eg d . The cubic NLO effects were substantially enhanced for materials synthesized from K 2 [TiO(C 2 O 4 ) 2 ], where χ (3) (-3ω; ω, ω, ω) values in the promising range of 10 -12 esu have been evaluated.
KW - Electrical properties
KW - NLO-effect
KW - Optical properties
KW - Thin films
UR - http://www.scopus.com/inward/record.url?scp=78651375649&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2010.11.011
DO - 10.1016/j.apsusc.2010.11.011
M3 - Artículo
AN - SCOPUS:78651375649
SN - 0169-4332
VL - 257
SP - 3313
EP - 3319
JO - Applied Surface Science
JF - Applied Surface Science
IS - 8
ER -