کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9812901 | 1518122 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spectro-ellipsometric studies of Au/SiO2 nanocomposite films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Au/SiO2 nanocomposite films in which Au nanoparticles were embedded in SiO2 matrix were fabricated via alternating sputtering of SiO2 and Au layers. In particular, we kept the nominal thickness of the Au layers below the threshold for the continuous layer formation whereas that of SiO2 layers was sufficient to form continuous layers. Transmission electron microscopy (TEM) images revealed that the Au nanoparticles were spherical in shape and that their average size was linearly proportional to the nominal thickness of Au layers. To account for the absorption variation of the composite films, including the absorption peak around 530 nm due to the surface plasmon resonance (SPR), we used Maxwell-Garnett effective medium theory (EMT) together with the modified Drude model. As it turned out, the combination of the modified Maxwell-Garnett effective medium theory and the aforementioned modification of the Drude model, which took the size of Au nanoparticles into consideration, were sufficient to model the variable-angle spectroscopic ellipsometry spectra. The values of the fitting parameters, such as film thickness, volume fraction of Au, and the diameter of Au nanoparticles, extracted from the modeling procedure were in good agreement with the results of TEM and spectrophotometer measurements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 475, Issues 1â2, 22 March 2005, Pages 133-138
Journal: Thin Solid Films - Volume 475, Issues 1â2, 22 March 2005, Pages 133-138
نویسندگان
Sunghun Cho, H. Lim, K.S. Lee, T.S. Lee, B. Cheong, W.M. Kim, Soonil Lee,