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    Öğe
    The effect of a novel organic compound chiral macrocyclic tetraamide-I interfacial layer on the calculation of electrical characteristics of an Al/tetraamide-I/p-Si contact
    (Elsevier Science Sa, 2007) Kilicoglu, T.; Aydina, M. E.; Topal, G.; Ebeoglu, M. A.; Saygili, H.
    The Al/tetraamide-I/p-Si Schottky barrier diode (SBD) has been prepared by adding a solution of a novel nonpolymeric organic compound chiral macrocylic tetraamide-I in chloroform on top of a p-Si substrate and then evaporating the solvent. It has been seen that the forward-bias current-voltage (I-V) characteristics of Al/tetraamide-I/p-Si SBD with a barrier height value of 0.75 eV and an ideality factor value of 1.77 showed rectifying behaviour. The energy distribution of the interface state density determined from I-V characteristics increases exponentially with bias from 5.81 x 10(12) cm(-2) eV(-1) at (0.59-E-v) eV to 1.02 x 10(13) cm(-2) eV(-1) at (0.40-E-v) eV. It has showed that space charge limited current (SCLC) and trap charge limited current (TCLC) are the dominant transport mechanisms at large forward-bias voltages. (C) 2007 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Usability of activated carbon with well-developed mesoporous structure for the decontamination of malachite green from aquatic environments: kinetic, equilibrium and regeneration studies
    (Springer, 2018) Saygili, H.; Guzel, F.
    This study examines the potential use of activated carbon (TAC) produced under optimized conditions from tomato processing waste (TW) as an adsorbent for the removal of malachite Green (MG) dye from aqueous solution. Batch experiments tested the effects of TAC dosage, initial concentration, contact time, ionic strength and temperature on adsorption property of TAC at the natural pH of TAC-MG in the aqueous medium. The adsorption kinetics could be expressed well by the pseudo-second order model. Intra-particle diffusion model process shows that it is governed by several mechanisms. Equilibrium data fitted well to the Langmuir isotherm. The maximum adsorption capacity was found as 526.32 mg/g at pH 4.0 and 328 K. Thermodynamic studies indicated that the process was endothermic and spontaneous.