کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9830106 | 1524503 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Unaggregated silicon nanocrystals obtained by ball milling
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Unaggregated silicon nanocrystals obtained by ball milling Unaggregated silicon nanocrystals obtained by ball milling](/preview/png/9830106.png)
چکیده انگلیسی
We have investigated the formation of silicon nanocrystals (Si-nc) ex situ of the silicon dioxide host matrix as well as their structural and optical properties. Two different methods were used: Si-nc prepared by electrochemical etching as reference and Si-nc fabricated by ball milling. We show that both methods are able to prepare Si-nc with quantum confinement size (<10Â nm). The Si-nc fabrication ex situ of host matrix allows investigating additional properties in colloidal ethanol dispersion by light scattering. The identification of Si-nc in the ethanol-based colloids has been performed by Malvern autosizer experiments. We show the clustering effect of Si-nc and as well as declustering step by adding ammonia to ethanol-based colloids. Reached Si-nc sizes from light scattering experiment corresponds to that evaluated by other independent techniques. Furthermore, we have prepared spin on glass-based self-supporting samples with high Si-nc concentration layers which allowed PL analysis. In all cases visible photoluminescence at room temperature was detected. However, for Si-nc prepared by ball milling a weak PL was detected, which likely originates rather from surface states then quantum confinement size effect.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 275, Issues 3â4, 1 March 2005, Pages 589-597
Journal: Journal of Crystal Growth - Volume 275, Issues 3â4, 1 March 2005, Pages 589-597
نویسندگان
V. Å vrÄek, J.-L. Rehspringer, E. Gaffet, A. Slaoui, J.-C. Muller,