Journal of Interfaces, Thin Films, and Low dimensional systems
The effect of system pressure on microstrain and photoluminescence properties of TiO2 nanowires
Document Type : Original Article
Author
Department of Physics, Islamic Azad University, Ruodehen, Iran.
Abstract
TiO2 nanowires were prepared by a thermal evaporation method at different pressures. The effects of pressure on morphology, microstructure, and photoluminescence properties were investigated by SEM, XRD, and spectrophotometer. XRD Analysis indicated the presence of rutile phases in samples. Williamson-Hall method was used for studying micro strain and crystallite size. The results showed that decreasing pressure leads to increasing micro strain due to increasing tension in the grain boundary with increasing oxygen vacancies as point defects. TiO2 nanowires prepared in lower pressure indicated weaker intensities in the PL spectrum due to increasing nonradiative centers obtained by oxygen vacancies that as an extinguisher the luminescence may trap photogenerated electron-hole.
Keywords
Main Subjects
Article Title [Persian]
اثر فشار هوا بر روی خواص میکروکرنش و فوتولومینسانس نانوسیم های TiO2
Author [Persian]
- سعیده رمضانی ثانی
گروه فیزیک، دانشگاه آزاد اسلامی، واحد رودهن، ایران.
Abstract [Persian]
نانوسیم‌های TiO2 با روش تبخیر حرارتی در فشارهای مختلف تهیه می‌شوند. اثرات فشار بر مورفولوژی، ریزساختار، و خواص فتولومینسانس توسط SEM، XRD و اسپکتروفتومتر بررسی شد. تجزیه و تحلیل XRD وجود فازهای روتیل را در نمونه ها نشان داد. از روش ویلیامسون هال برای بررسی میکروکرنشو اندازه کریستالیت استفاده شد. نتایج نشان داد که کاهش فشار منجر به افزایش میکروکرنش به دلیل افزایش کشش در مرز دانه با افزایش فضای خالی اکسیژن به عنوان نقص نقطه ای می شود. نانوسیم‌های TiO2 تهیه‌شده در فشار پایین‌تر، شدت‌های ضعیف‌تری را در طیف PL نشان می‌دهند که دلیل آن افزایش مراکز غیر تشعشعی به‌دست‌آمده از جای خالی اکسیژن است که به عنوان خاموش‌کننده، لومینسانس ممکن است حفره‌های الکترونی تولید شده را به دام بیندازد.
Keywords [Persian]
- نانوسیم های TiO2
- سیستم
- میکروکرنش
- جاهای خالی اکسیژن
- فتولومینسانس
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