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Near Infrared Optical Absorption of Gold Nanoparticle Aggregates
- Source :
- The Journal of Physical Chemistry B. 106:7005-7012
- Publication Year :
- 2002
- Publisher :
- American Chemical Society (ACS), 2002.
-
Abstract
- The reduction of HAuCl4 by Na2S has been reported to produce gold nanoparticles with an optical absorption in the near-infrared along with its characteristic absorption in the visible. The optical resonances in the visible are due to the gold surface plasma, which are a function of the geometry of the particles. The near-infrared absorption had been attributed to the formation of Au2S/Au core/shell structures. In this report we present new electronic absorption, electron microscopy, and X-ray absorption data in several systems to show that the near-infrared absorption does not involve core/shell structures. We further suggest that the near-infrared adsorption is most likely the result of the formation of aggregates of gold nanoparticles. The identification of the origin of the near-infrared resonance is critical in understanding the optical properties of metal nanoparticle systems.
- Subjects :
- Materials science
Shell (structure)
Analytical chemistry
Physics::Optics
Nanoparticle
Resonance
Photochemistry
Surfaces, Coatings and Films
Core (optical fiber)
Metal
Adsorption
Colloidal gold
visual_art
Materials Chemistry
visual_art.visual_art_medium
Physical and Theoretical Chemistry
Absorption (electromagnetic radiation)
Subjects
Details
- ISSN :
- 15205207 and 15206106
- Volume :
- 106
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry B
- Accession number :
- edsair.doi...........1cfcc3d77c6fdba98ec5353940edf996