Abstract
The size and interposition of particles is a key parameter for the practical application of metallic nanostructures which requires the development of a synthesis method with precise control over their parameters. In this work the method for the synthesis of gold nanostructures in the pores of silicon dioxide from a gold sulfite complex and a gold chloride solution via wet chemistry technique was proposed. The influence of deposition parameters, such as deposition temperature and electrolyte composition, on the deposit morphology was studied. It was shown that gold agglomerates were unevenly distributed over the silicon surface at high temperatures and practically uniformly distributed with temperature decrease. Addition of fluoric acid at the deposition stage defines the metal precipitation selectivity into the silicon oxide pores. The peculiarities of gold nanostructures formation mechanism were discussed.
Highlights
The steady increase in the number of publications devoted to nanostructures (NSs) and nanostructured materials is due to their unique properties, which are not typical for the bulk objects of the same composition [1, 2]
The increase of the gold amount on the surface of the SiO2/Si template with electrolyte temperature decrease is clearly visible on SEM images (Fig. 1(a, d, g)) obtained from a large sample area
At 50°C single gold agglomerates are formed on the surface, and most of pores remain unfilled (Fig. 1(a, b, c)
Summary
The steady increase in the number of publications devoted to nanostructures (NSs) and nanostructured materials is due to their unique properties, which are not typical for the bulk objects of the same composition [1, 2]. When a light wave interacts with an NS with characteristic dimensions smaller than the wavelength of light, an oscillation of electronic cloud with plasmonic frequency ωp arises at the metal/dielectric interface (most often the dielectric is air) [5]. These areas are characterized by a high electrical field intensity – ‘hot spots’ [6]. The optical properties of plasmonic NSs strongly depend on the size, shape and type of metal [8] These parameters determine the position and intensity of the plasmon resonance, the knowledge of which is required for laser type selection for SERS research.
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