اثر حضور نانوخوشه‌های مس به عنوان زیرلایه بر خواص بلوری و نوری لایه دی‌اکسیدتیتانیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

پژوهشگاه مواد و انرژی

چکیده

دو نمونه از نانوخوشه­های مس روی بسترهایی از کوارتز با ضخامت 10 نانومتر و 20 نانومتر رشد داده شدند. هر نمونه با یک لایه دی­اکسیدتیتانیوم به ضخامت 300 نانومتر پوشش داده شد. برای مقایسه لایه دی­اکسیدتیتانیوم با ضخامت 300 نانومتر روی بسترهای کوارتز نیز لایه­نشانی شدند. همه لایه­ها به روش رسوب­دهی فیزیکی بخار (PVD) و با استفاده از دستگاه لایه­نشانی با باریکه الکترونی (EBD) تهیه شدند. اثر نانوخوشه­های مس بر ریخت­شناسی سطح، اندازه دانه­ها، مرزدانه­ها، ساختار و فازهای بلوری و برخی از خواص نوری مانند جذب و عبور لایه دی­اکسیدتیتانیوم بررسی شدند. ریخت­شناسی سطح لایه­­ها با میکروسکوپ الکترونی روبشی نشر میدانی (FESEM) و ساختار بلوری لایه­ها و تبدیل­های فازی در اثر عملیات گرمایی با استفاده از پراش پرتو ایکس (XRD) بررسی شدند. از طیف­سنجی فرابنفش-مرئی برای تجزیه و تحلیل جذب و عبور لایه­های دی­اکسیدتیتانیوم استفاده شد. حضور نانوخوشه­های مس به عنوان زیر لایه باعث افزایش زبری لایه­های TiO2 و تسهیل تبدیل فاز آناتاز به روتیل در این لایه­ها می­شود. علاوه براین در حضور زیر لایه نانوخوشه­های مس، گاف انرژی لایه TiO2 کاهش می­باید و جذب نوری آن در ناحیه مرئی بهبود می­یابد.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of copper nano-cluster as sublayer on optical and crystalline properties of titanium dioxide layers

چکیده [English]

Two 10 and 20nm samples of Cu nano-cluster were grown on quartz substrates with a thickness of by electron beam deposition method. Nanolayers of titanium dioxide with a thickness of 300 nm were deposited on these Cu nano-cluster layers. For comparison، a layer of titanium dioxide with a thickness of 300 nm was also coated on quartz substrate. All coatings were conducted using electron-beam physical vapor deposition. The effect of Cu nano- cluster thickness on the surface morphology، grain size، grain boundaries، crystalline structure and phases, and optical properties of titanium dioxide layers were studied. The Field Emission Scanning Electron Microscope (FESEM) was used to analyze the surface morphology of prepared layers. Moreover, the crystalline structure of layers and phase transitions on heat treatment were studied using X-Ray Diffraction (XRD). The UV-Visible spectroscopy was used to analyze of the absorption and transmission spectra of titanium dioxide layers. Presence of Cu nano-cluster layers as sublayer increases surface roughness of the obtained TiO2 layers and facilitates the phase transformation TiO2 from anatase to rutile. Furthermore, presence of Cu nano-cluster sublayer decreases TiO2 band gap energy for visible light absorption.

کلیدواژه‌ها [English]

  • Copper nano-clusters
  • titanium dioxide
  • absorption
  • transmission
  • Band gap

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  • تاریخ دریافت: 12 شهریور 1396
  • تاریخ بازنگری: 08 مهر 1396
  • تاریخ پذیرش: 24 آبان 1396

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