کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1676764 | 1518104 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation of ultra-thin films of DNA bases with laser light at 157 nm
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
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چکیده انگلیسی
Ultra-thin films of a few nanometers thick of the DNA bases adenine, guanine and cytosine were prepared on Si substrates by applying laser ablation at 157 nm to etch initially prepared crystal samples from solutions. This was possible because only photochemical dissociation is taking place on DNA bases following illumination with laser light at 157 nm and localized damage. High-resolution AFM images reveal similar morphology between areas exposed or not to radiation, suggesting a limited chemical change on the surface of the remaining radiated substrate. For a laser fluence of 1 mJ/cm2, an average film thickness of 0.5, 03 and 0.7 nm was removed from the initial adenine, cytosine and guanine crystal samples; this allows an accurate sub-nanometer control of the film thickness with the laser fluence. In addition, the surface roughness of laser-treated crystals was reduced down to nanometer-scale dimensions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 495, Issues 1â2, 20 January 2006, Pages 45-50
Journal: Thin Solid Films - Volume 495, Issues 1â2, 20 January 2006, Pages 45-50
نویسندگان
E. Sarantopoulou, Z. Kollia, A.C. Cefalas, Z. Samardžija, S. Kobe,