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Highly stable Ga-doped ZnO/polystyrene nanocomposite film with narrow-band cyan emission

Journal of Semiconductors 2022年第12期43卷 46-54页

作者： Sanaz Alamdari Majid Jafar Tafreshi morteza sasani ghamsari Department of Nanotechnology Faculty of New Sciences and TechnologiesSemnan UniversitySemnan35131-19111Iran Faculty of Physics Semnan University35195-363SemnanIran Photonics&Quantum Technologies Research School Nuclear Science and Technology Research Institute11155-3486TehranIran

In the present study,a simple method for the preparation of a luminescent flexible gallium doped zinc oxide(GZO)/polystyrene nanocomposite film was *** prepared GZO powder was characterized through different optical and structural *** XRD study revealed the existence of a wurtzite structure with no extra oxide ***-mapping,EDX,FTIR and XPS analyses were used to confirm the presence of elements and the several groups present in the *** excitations of UV,the prepared hybrid nanocomposite showed a strong cyan emission with narrow full width at half the maximum value(20 nm)that has not been reported before.X-ray and laser-induced luminescence results of the hy-brid film revealed novel blue-green emission at room *** prepared composite film showed a strong scintillation re-sponse to ionizing *** strong emissions,very weak deep-level emissions,and low FWHM of composite indicate the de-sirable optical properties with low-density structural defects in the GZO composite ***,the prepared hybrid film can be considered to be a suitable candidate for the fabrication of optoelectronic devices.

关键词： Ga doped ZnO cyan emission narrow-band emission nanocomposite

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Effect of Sulfur Precursor on Dimensions of One-dimensional CdS Nanocrystals

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Journal of Materials Science & Technology 2009年第4期25卷 462-464页

作者： M.Maleki Sh.Mirdamadi R.Ghasemzadeh M.sasani ghamsari Department of Metallurgy and Material Engineering Iran University of Science & Technology Solid State Lasers Research Group Laser & Optics Research School

One-dimensional CdS nanocrystals have been prepared by solvothermal method using cadmium acetate as a cadmium precursor, elemental sulfur and Na2S, as a sulfur precursor, and ethylenediamine as a solvent at 150℃ for 5 h. The nanocrystals were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and UV-Vis absorption spectroscopy. XRD patterns indicate that both Na2S and elemental sulfur as the sulfur precursor result in CdS nanorods with wutzite phase （hexagonal structure）. SEM and TEM images show that diameter of CdS nanorods can be decreased using Na2S instead of elemental sulfur. For the growth of CdS nanorods, a mechanism has been proposed. Uv-Vis absorption of CdS nanorods （sulfur precursor： Na2S） was shown blue shift to 485 nm due to the quantum size effect.

关键词： Nanomaterials Semiconductors CdS nanorods Na2S Solvothermal method

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Growth of TiO_2 Nanorods by Sol-gel Template Process

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Journal of Materials Science & Technology 2007年第5期23卷 611-613页

作者： A.Sadeghzadeh Attar Sh.Mirdamadi F.Hajiesmaeilbaigi M.sasani ghamsari Department of Metallurgy and Materials Engineering Iran University of Science and TechnologyTehranIran Solid State Laser Research Group Laser Research Center11365-8486TehranIran

In this work, TiO2 nanorods with uniform diameter of about 100 nm and a length of several micrometers were successfully prepared by the sol-gel template method. Also the influence of molar ratios of precursor on the morphology and structure of TiO2 nanorods has been investigated. The prepared samples were characterized by Fourier transform infrared spectroscopy （FTIR）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The XRD results indicated that the TiO2 nanorods were crystallized in the anatase and rutile phases, after annealing to 400-700℃ up to 2 h.

关键词： TiO2 nanorods Sol-gel process Template-based growth

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A report of left dorsal displacement of the large colon in a tropical horse

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Asian Pacific Journal of Tropical Biomedicine 2013年第4期3卷 325-329页

作者： Farhang sasani Javad Javanbakht Mehdi ghamsari Mehdi Aghamohammad Hassan Department of Pathology Faculty of Veterinary MedicineUniversity of TehranTehranIran Department of Clinical Science Faculty of Veterinary MedicineUniversity of TehranTehranIran

We report one such case which was diagnosed intraoperatively as left dorsal colon volvulus due to multiple mesenteric abnormalities.A 17-year-old castrated male horse was taken to the Tehran University Veterinary Hospital for treatment of metacarpal wound accompanied by severe abdominal distension and acute *** treatment and measurement were taken for a month,and the prepared biopsy indicated that the healing trend was ***,prior to discharge,the clinical colic manifestations emerged and the animal suddenly *** large intestine was palpated per rectum and a ventral midline exploratory laparotomy was performed,a complete volvulus of the ascending colon was identified with multiple mesenteric anomalies of unknown *** pathologic changes observed in this study accurately reflect those changes reported in horse with naturally occurring colonic volvulus and can serve as a reference for subsequent studies on attenuating bowel *** present study results can be used to make a scientific assessment of prognosis in the pre-operative,operative,and post-operative management of horses with large colon volvulus.

关键词： Large colon Horse Pathology Volvulus Laparotomy

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