Blueshift of the silver plasmon band using controlled nanoparticle dissolution in aqueous solution

Klaus Bo Mogensen, Katrin Kneipp

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Abstract

In this work, we report the size-dependent blue shift of the silver nanoparticle plasmon band in aqueous solution by means of UV/VIS spectroscopy. An oxidative dissolution scheme allows a gradual decrease in the particle sizes by controlled oxidation during recording of the optical spectra. Hence, all sizes until complete dissolution can be obtained on the same substrate, thereby avoiding substrate-to-substrate variations and greatly increasing the size resolution. Cyanide and cysteamine are strong nucleophiles (electron pair donors) that deposits negative charge onto the NP surface. A 1/R-dependence of the plasmon peak energy is seen, which is interpreted as an increase in the free electron density of the nanoparticles.
Utilization of the size-dependent electronic contribution to the optical response in nanoplasmonic sensors is shown to be a promising extension to improve the sensitivity and specificity, as compared to traditional refractive index sensing.
Original languageEnglish
Title of host publicationProceedings of Nanotech 2014
Number of pages4
Publication date2014
Publication statusPublished - 2014
EventNanotech 2014: Nanotechnology Conference and Expo - Gaylord National Hotel and Convention Center, Washington DC, United States
Duration: 15 Jun 201418 Jun 2014

Conference

ConferenceNanotech 2014
LocationGaylord National Hotel and Convention Center
CountryUnited States
CityWashington DC
Period15/06/201418/06/2014

Keywords

  • Plasmonics
  • Biosensor
  • Blue shift
  • Nanoparticles
  • Cyanide

Cite this

Mogensen, K. B., & Kneipp, K. (2014). Blueshift of the silver plasmon band using controlled nanoparticle dissolution in aqueous solution. In Proceedings of Nanotech 2014