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    Effect of coumarin concentration on the physical properties of CdO nanostructures
    (Elsevier Sci Ltd, 2014) Sahin, B.; Bayansal, F.; Yuksel, M.; Biyikli, N.; Cetinkara, H. A.
    In this work, nanostructured CdO films with different coumarin contents in the growth solution were fabricated on glass substrates by the HEAR method. The effects of coumarin content in the bath on optical, structural and morphological properties were studied by means of (UV-vis) spectrophotometer, SEM and XRD analysis. The analysis showed that the band gaps, surface morphologies and XRD peak intensities of the CdO films were found to change with coumarin content. A change in the band gap energy can be attributed to the improvement in crystallinity of the samples. XRD analysis showed that, the films have poly-crystalline structures with decent crystallinity levels. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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    Influence of coumarin as an additive on CuO nanostructures prepared by successive ionic layer adsorption and reaction (SILAR) method
    (Elsevier Science Sa, 2013) Bayansal, F.; Sahin, B.; Yuksel, M.; Biyikli, N.; Cetinkara, H. A.; Guder, H. S.
    The effect of coumarin doping during the growth of CuO nanostructures by SILAR method has been studied. It was found that coumarin consider ably influences the growth process, manipulates the band-gap and modifies the crystallite size of the films. XRD experiments evidenced that with higher coumarin concentrations in the growth solution, the microstrain and dislocation density increased, while the crystallite size of the films decreased. SEM images revealed that the thicknesses of the plate-like nanostructures decreased with increasing coumarin concentration. By UV/vis spectrophotometer analysis it is found that the coumarin concentration affects both the optical band gap and the transmission rate: both the band gap and spectral transmittance values of the films decreased for higher coumarin content. (C) 2013 Elsevier B. V. All rights reserved.