کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
594337 1453980 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of rod-like silica–gold core-shell structures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Synthesis of rod-like silica–gold core-shell structures
چکیده انگلیسی

Synthesis of rod-like silica–gold core-shell structures is reported by using silica rods having length of ∼1 μm and diameter of ∼200 nm. Before deposition of gold nanoparticles the aforementioned silica rods were modified by using 3-aminopropyltrimethoxysilane (APTMS) in order to attach aminopropyl groups and consequently, to facilitate deposition of Au. There methods were used to deposit Au nanoparticles. The first method of deposition was performed by using nanosized Au nanoparticles obtained by reduction of tetrachloroauric acid with borohydride. The second route was performed by direct reduction of tetrachloroauric acid with formaldehyde, which led to the formation of Au nanoparticles of about 50 nm. In the third route Au nanoparticles were obtained by reduction tetrachloroauric acid with borohydride but their deposition was carried out on the silica rods pre-decorated with small Au colloids. Each of these methods led to the formation of Au less or more uniform nanoshells on siliceous rods.

Figure optionsDownload as PowerPoint slideHighlights
► Uniform silica rods have been prepared by using a new recipe.
► Thin gold shells on aminopropyl-modified silica rods were obtained by reduction of tetrachloroauric acid with borohydride.
► Thicker gold shells on aminopropyl-modified silica rods were prepared by reduction of tetrachloroauric acid with formaldehyde.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 393, 5 January 2012, Pages 37–41
نویسندگان
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