Abstract
Electrodeposition of gold into porous silicon was investigated. In the present study, porous silicon with ~100 nm in pore diameter, so-called medium-sized pores, was used as template electrode for gold electrodeposition. The growth behavior of gold deposits was studied by scanning electron microscope observation of the gold deposited porous silicon. Gold nanorod arrays with different rod lengths were prepared, and their surface-enhanced Raman scattering properties were investigated. We found that the absorption peak due to the surface plasmon resonance can be tuned by changing the length of the nanorods. The optimum length of the gold nanorods was ~600 nm for surface-enhanced Raman spectroscopy using a He–Ne laser. The reason why the optimum length of the gold nanorods was 600 nm was discussed by considering the relationship between the absorption peak of surface plasmon resonance and the wavelength of the incident laser for Raman scattering.
Highlights
Among biophysical and biochemical analyses, Raman spectroscopy plays an important role in the identification and structural characterization of molecules
We found that the filling of gold nanoparticles and/or nanorods within mesoporous silicon was achieved by stabilization of Au ions via complexation with S2O32− and SO32−, leading to the negative shift of the potential and the slowdown of the displacement deposition rate
It was revealed in a previous study that porous silicon with ~100 nm in diameter, which is so-called medium-sized pores, was formed using highly doped silicon in an HF solution containing an oxidizing agent [17]
Summary
Among biophysical and biochemical analyses, Raman spectroscopy plays an important role in the identification and structural characterization of molecules. The most commonly used substrates for surface-enhanced Raman spectroscopy are silver and gold colloids. The stability of the colloid solution and poor reproducibility due to aggregation are two major problems [6,7] Another common substrate is a roughened metal electrode. Raman spectroscopy using porous silicon is still limited This is because the deposition of silver and/or gold by electrochemical techniques is usually difficult due to the fast displacement deposition. One paper reports the surface-enhanced Raman spectra from silver within porous silicon template, the deposition was not carried out electrochemically [16]. We report on a method for producing surface-enhanced Raman scattering-active gold nanorod arrays by electrodeposition using porous silicon. We found that a high surface-enhancement can be obtained by controlling the length of nanorods
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