Abstract
Self-organized silver nanostructures were grown in porous Si/SiO2 matrix fabricated by ion track technology. The different silver nanostructures with shapes like “sunflowers”, “azalea” or “corn” were realized by applying wet-chemical electroless deposition. We show that reproducible self-organized silver “sunflower” like nanostructures provide a high enhanced Raman signal of Nile blue dye molecules. Signal enhancement for a few or even just a single silver “sunflower” is demonstrated by analyzing the surface-enhanced Raman signature of Nile blue dye molecules. According to this, the silver nanostructures can act as efficient surfaces for surface enhanced Raman spectroscopy as well as (bio)-sensor applications.
Highlights
A great deal of effort has been made to fabricate well-defined noble-metal nanostructures such as nanoparticles, nanorods, and nanowires due to their unique optical, electronic, catalytic, and surface-enhanced Raman scattering (SERS) properties [1,2,3,4,5]
In this paper we demonstrate the synthesis of Ag hierarchical nanostructures arrays as shown in Fig. 2 consisting of complex but adjustable structures produced by a surfactant-free and rather simple production route under mild conditions
We have for the first time demonstrated a simple method for the formation of silver nanostructures deposited in etched swift heavy ion (SHI) tracks in SiO2 by applying a wet-chemical electrodless silver deposition (WCED)
Summary
A great deal of effort has been made to fabricate well-defined noble-metal nanostructures such as nanoparticles, nanorods, and nanowires due to their unique optical, electronic, catalytic, and surface-enhanced Raman scattering (SERS) properties [1,2,3,4,5]. A variety of approaches have recently been demonstrated for the shape-controlled synthesis of noble-metal nanostructures because their properties and applications are greatly influenced by their morphology [6]. Dendritic and fractal structures with large surface areas, composed of major trunks and many hierarchical side branches, provide a great opportunity to improve their properties for many different applications. 3D metallic nanostructures with large active surfaces lead to the increase of the sensitivity since more molecules are adsorbed in the focus area of the laser in comparison to conventional 2D SERS active surfaces
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