Gold Nanostructures for Surface-Enhanced Raman Spectroscopy, Prepared by Electrodeposition in Porous Silicon

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.

Rapid detection of mercury contamination in water by surface enhanced Raman spectroscopy

“…Unlike colloidal substrates, solid SERS-active substrates offer the advantages of easy handling, long term stability and adaptability to in-eld screening. 45,46 We recently developed a solid nanostructured gold substrate for highly reproducible SERS measurements. The substrate was manufactured by electrochemical deposition of gold nanostructures onto a gold surface to deliver high density of hot spots and high SERS enhancement factor.…”

Gold nanoparticle assembly on porous silicon by pulsed laser induced dewetting

“…PS coated with noble metal NPs, such as Au and Ag, has also been extensively studied for surface enhanced Raman scattering (SERS) substrates. [8][9][10] The most commonly used methods for the deposition of metal NPs on PS are the wet chemical techniques, including drop casting of metal colloidal solutions, 3,5,6 metal-assisted chemical etching of silicon, 4,11 immersion plating, 9,10,12 electroplating, 7,13 and thermal decomposition of metal salts. 14 These wet chemical methods are oen simple, inexpensive, and applicable for high throughput production, however they possess certain drawbacks including long synthesis time, inhomogeneous NP loading, and NP aggregation.…”

Optical absorption and photoluminescence studies of gold nanoparticles deposited on porous silicon

“…Instead of using silicon as the substrate for the AuNP deposition, Fukami et al [11] discovered the use of porous Si to control the shape and alignment of metal nanostructures. In this paper, we demonstrate that AuNPs supported on zinc oxide (ZnO) that was synthesized via the deposition-precipitation method can be deposited into porous silicon (PSi) using electrochemical deposition (ECD) technique.…”