کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1666882 1518076 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A substrate independent approach for generation of surface gradients
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
A substrate independent approach for generation of surface gradients
چکیده انگلیسی

Recently, surface gradients have attracted significant interest for various research and technological applications. In this paper, we report a facile and versatile method for generating surface gradients of immobilized nanoparticles, nanotopography and ligands that is independent from the substrate material. The method consists of first depositing a functional polymer layer on a substrate and subsequent time controlled immersion of this functionalized substrate in solution gold nanoparticles (AuNPs), silver nanoparticles (AgNPs) or poly (styrenesulfonate) (PSS). Chemical characterization by X-ray Photoelectron Spectroscopy (XPS) and morphological analysis by Atomic Force Microscopy (AFM) show that the density of nanoparticles and the concentration of PSS across the surface increases in a gradient manner. As expected, time of immersion determines the concentration of surface bound species. We also demonstrate the generation of surface gradients of pure nanotopography. This is achieved by depositing a 5 nm thick plasma polymer layer on top of the number density gradient of nanoparticles to achieve a homogeneous surface chemistry. The surface independent approach for generation of surface gradients presented in this paper may open opportunities for a wider use of surface gradient in research and in various technologies.


► We present a substrate independent approach for generation of surface gradients.
► We demonstrate well-defined density gradients of gold and silver nanoparticles.
► We provide an example of pure surface nanotopography gradients.
► We demonstrate concentration gradients of bound ligands.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 528, 15 January 2013, Pages 106–110
نویسندگان
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