Porous silicon photoluminescence modification by colloidal gold nanoparticles: Plasmonic, surface and porosity roles

• Published in: Journal of luminescence Vol. 146; pp. 247 - 255
• Main Authors: de la Mora, M.B., Bornacelli, J., Nava, R., Zanella, R., Reyes-Esqueda, J.A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-02-2014; Elsevier
• Subjects: Chemical modification; Collective effects; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations); Colloids; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electron states; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Exchange, correlation, dielectric and magnetic functions, plasmons; Gold; Gold nanoparticles; Materials science; Nanoparticles; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Plasmons; Porosity; Porous silicon; Semiconductors; Surface and interface electron states; Surface plasmon resonance; Chemical modification; Surface plasmon resonance; Porosity; Porous silicon; Gold nanoparticles; Photoluminescence; Semiconductor materials; Porous materials; Surface treatments; Nanoparticles; Casting; Optical properties; Plasmons; Silicon; Plasmonics
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2013.09.053

Metal nanoparticles on semiconductors are of interest because of the tunable effect of the surface plasmon resonance on the physical properties of the semiconductor. In this work, colloidal gold nanoparticles obtained by two different methods, with an average size of 6.1±2.0nm and 5.0±2.0nm, were added to luminescent porous silicon by drop casting. The gold nanoparticles interact with porous silicon by modifying its optical properties such as photoluminescence. That being said, plasmon effects are not the only to be taken into account; as shown in this work, surface chemical modification and porosity also play a key role in the final performance of photoluminescence of a porous silicon–gold nanoparticle hybrid system.
•A hybrid material consisting of porous silicon and gold nanoparticles was fabricated.•Porous silicon/gold nanoparticle hybrid material was made by drop casting.•Influence of plasmonics, surface chemical modification and porosity on the optical behavior of our material was analyzed.•Porosity is proposed as a parameter control to obtain the best effects on luminescence of the hybrid plasmonic material.