Optical absorption and photoluminescence studies of gold nanoparticles deposited on porous silicon
1 School of Physics, Universiti Sains Malaysia, Penang, 11800, Malaysia
2 Material Innovations and Nanoelectronics (MINE) Research Group, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Skudai, Johor, 81310, Malaysia
3 Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, Skudai, Johor, 81310, Malaysia
4 School of Chemical Sciences, Universiti Sains Malaysia, Penang, 11800, Malaysia
Nanoscale Research Letters 2013, 8:35 doi:10.1186/1556-276X-8-35Published: 18 January 2013
We present an investigation on a coupled system consists of gold nanoparticles and silicon nanocrystals. Gold nanoparticles (AuNPs) embedded into porous silicon (PSi) were prepared using the electrochemical deposition method. Scanning electron microscope images and energy-dispersive X-ray results indicated that the growth of AuNPs on PSi varies with current density. X-ray diffraction analysis showed the presence of cubic gold phases with crystallite sizes around 40 to 58 nm. Size dependence on the plasmon absorption was studied from nanoparticles with various sizes. Comparison with the reference sample, PSi without AuNP deposition, showed a significant blueshift with decreasing AuNP size which was explained in terms of optical coupling between PSi and AuNPs within the pores featuring localized plasmon resonances.