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    Comprehensive research on physical properties of Zn and M (M: Li, Na, K) double doped cadmium oxide (CdO) nanostructures using SILAR method
    (ELSEVIER SCI LTD, 2017) Aydin, Rasit; Sahin, Bunyamin
    This research outlines the effect of Zn doping, (Zn+Li), (Zn+Na) and (Zn+K) doubly doping of nanostructured CdO films on the structural, morphological and optical properties of the films. Un-doped, Zn-doped, (Zn+Li), (Zn+Na) and (Zn+K) double doped CdO films were synthesized on soda lime glass substrates by the SILAR method. Manufactured CdO films attached well to the glass substrates, exhibited nano-sized structures, and the physical properties of the nanoparticles were modified by co-doping. The XRD analysis confirmed that all the films exhibited face-centered cubic structure with (111) and (200) preferential growth. Calculated crystallite size values of the CdO films via the Scherrer equation decreased with Zn doping and double-doping. Optical measurements revealed that doping modifies the band gap enabling the potential of these films to be utilized in optoelectronic applications.
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    Prediction of prognosis in patients with epidural hematoma by a new stereological method
    (TOHOKU UNIV MEDICAL PRESS, 2007) Kalkan, Erdal; Cander, Basar; Gul, Mehmet; Girisgin, Sadik; Karabagli, Hakan; Sahin, Bunyamin
    Epidural hematoma (EH) is a serious clinical event observed in 2% of head trauma patients. Studies regarding the effects of epidural hematoma volume (EHV) on prognosis are not sufficient. In this study, we applied the volume fraction approach of the stereological method to estimate the hematoma to brain volume fraction (HBVF), and investigated the relation between the HBVF and prognosis. Fifty-nine EH patients (46 male and 13 female subjects, with average age of 21 years) admitted to the emergency clinic were included. The HBVF was estimated on the printed films of cranial computed tomography scans. For this purpose, common point counting grids were superimposed over the scan frames. According to the clinical results, patients were divided into three groups as complete recovery (43), disability (8) and exitus (8). The HBVF was compared with the clinical results. HBVF was determined as 4.6% in the patients with recovery, 8.1% in disability, and 7.6% in exitus patients. The HBVF values were lowest in recovery patients, and the difference between the recovery and the other two groups was statistically significant (p = 0.007). However, there was no statistically significant difference in HBVF between disability and exitus patients (p > 0.05). In conclusion, the HBVF can be an important tool to determine prognosis, and it can be measured using the volume fraction approach of stereological methods as developed in the present study.
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    The role of Triton X-100 as a surfactant on the CdO nanostructures grown by the SILAR method
    (ELSEVIER SCIENCE SA, 2017) Aydin, Rasit; Sahin, Bunyamin
    In this work, the effect of surfactant Triton X-100 (TX-100) on structural, morphological and optical properties of nanostructured CdO films has been researched. Four series of nanostructured CdO films with TX-100 concentrations of 0.25e1.0 M% of the growth solution were prepared by the Successive Ionic Layer Adsorption and Reaction (SILAR) technique on glass substrates and were characterized by scanning electron microscopy, surface roughness, X-Ray diffraction and UV-Vis. Spectroscopy. Scanning electron microscopy exhibited that the particle thickness increased with increasing TX-100 content. Surface roughness (Ra) measurement exhibited that Ra value accordingly decreases in the presence of TX-100. From the X-Ray diffraction patterns it was calculated that the crystallite size of the films increased parallel to the particle size with increasing TX-100 content. UV results presented that the optical bandgap values of the film can be adjusted with TX-100 content where optical bandgap decreased with increasing TX-100 content in the growth bath. The results show that the amount of TX-100 in the growth bath played a significant mission in adjusting the main physical properties of the nanostructured CdO film. (C) 2017 Elsevier B. V. All rights reserved.
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    Sodium dodecyl sulfate-assisted SILAR synthesis of nanostructured cadmium oxide films
    (ELSEVIER SCI LTD, 2016) Aydin, Rasit; Sahin, Bunyamin; Bayansal, Fatih
    Nanostructured CdO films were prepared on glass substrates by a surfactant sodium dodecyl sulfate (SDS) assisted SILAR technique. The influence of SDS concentrations of the growth solution on the structural, morphological and optical properties of the films was investigated and discussed. From the metallurgical microscope and scanning electron microscope images, it was seen that the surface morphology of the films are significantly enhanced by SDS addition. XRD investigations confirmed that the films have good crystallinity levels and are grown preferentially in (111) and (200) orientations. UV-vis. spectroscopy investigations showed that the bandgap and transmittance values of the films are affected dramatically by SDS concentrations. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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    A study of the influences of transition metal (Mn,Ni) co-doping on the morphological, structural and optical properties of nanostructured CdO films
    (SPRINGER, 2018) Gurbuz, Elif; Aydin, Rasit; Sahin, Bunyamin
    In this paper, a systematic investigations on the effects of transition metals such as Mn and Ni-dopant on physical properties of cadmium oxide (CdO) thin films coated on soda lime glass substrates by using SILAR method have been reported. The characterizations of un-doped, Mn-doped (Cd-0.99 Mn0.01O) and Mn/Ni double doped CdO [(Cd0.99-xMn0.01NixO)(0 <= x <= 0.001)] films were investigated by SEM, EDX, XRD and UV-Vis spectrophotometry to determine the morphological, structural and optical properties, respectively. SEM analysis showed that the surface morphologies of the CdO films were influenced by Mn doping and Mn/Ni co-doping. The EDX result verified the presence of expected elements Cd, O, Mn and Ni in the growing solution. The crystal phases of the samples and their crystallinity quality have been investigated by XRD measurements. The X-ray diffractograms show all the diffraction peaks are highly intense also they demonstrate the preferential orientations of (111) and (200) directions. Optical investigations revealed red shift with Mn doping and Mn/Ni co-doping in the absorbance spectrum.