HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Optical extinction and scattering cross sections of plasmonic nanoparticle dimers in aqueous suspension

Abstract : Absolute extinction and scattering cross sections for gold nanoparticle dimers were determined experimentally using a chemometric approach involving singular-value decomposition of the extinction and scattering spectra of slowly aggregating gold nanospheres in aqueous suspension. Quantitative spectroscopic data on plasmonic nanoparticle assemblies in liquid suspension are rare, in particular for particles larger than 40 nm, and in this work we demonstrate how such data can be obtained directly from the aggregating suspension. Our method can analyse, non invasively, the evolution of several sub-populations of nanoparticle assemblies. It may be applied to other self-assembling nanoparticle systems with an evolving optical response. The colloidal systems studied here are based on 20, 50 and 80 nm gold nanospheres in aqueous solutions containing sodium lipoate. In these systems, the reversible dimerisation process can be controlled using pH and ionic strength, and this control is rationalised in terms of DLVO theory. The dimers were identified in suspension by their translational and rotational diffusion through scattering correlation spectroscopy. Moreover, their gigadalton molecular weight was measured using electrospray charge-detection mass spectrometry, demonstrating that mass spectrometry can be used to study nanoparticles assemblies of very high molecular mass. The extinction and scattering cross sections calculated in the discrete-dipole approximation (DDA) agree very well with those obtained experimentally using our approach.
Document type :
Journal articles
Complete list of metadata

Cited literature [90 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01386353
Contributor : Martinus H. V. Werts Connect in order to contact the contributor
Submitted on : Thursday, October 29, 2020 - 5:43:54 PM
Last modification on : Monday, February 21, 2022 - 3:38:08 PM
Long-term archiving on: : Saturday, January 30, 2021 - 6:34:59 PM

File

plasmonic-nanoparticle-dimers-...
Files produced by the author(s)

Identifiers

Citation

Matthieu Loumaigne, Clyde Midelet, Tristan Doussineau, Philippe Dugourd, Rodolphe Antoine, et al.. Optical extinction and scattering cross sections of plasmonic nanoparticle dimers in aqueous suspension. Nanoscale, Royal Society of Chemistry, 2016, 8 (12), pp.6555-6570. ⟨10.1039/c6nr00918b⟩. ⟨hal-01386353⟩

Share

Metrics

Record views

288

Files downloads

347