Optical properties of thermally responsive amphiphilic gold nanoparticles protected with polymers

Jun Shan, Jie Chen, Markus Nuopponen, Tapani Viitala, Hua Jiang, Jouko Peltonen, Esko I. Kauppinen, Heikki Tenhu (Corresponding Author)

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Abstract

Amphiphilic thermally responsive gold nanoparticles have been prepared by protecting the particles with both polystyrene, PS, and poly(N-isopropylacrylamide), PNIPAM, chains. Particles form a monolayer on a water surface in a Langmuir trough, and according to in situ spectroscopic measurements, the surface plasmon resonance, SPR, band undergoes a blue-shift during the monolayer compression. The compression-induced blue-shift is related to a change in the conformation of tethered PNIPAM chains; the phenomenon is discussed on the basis of Mie−Drude theory. In contrast, a red-shift in the SPR of the multilayers of the same nanoparticles transferred at different temperatures has been observed with increasing the deposition cycle, attributed to the presence of a weak interparticle coupling in the multilayer.
Original languageEnglish
Pages (from-to)794-801
Number of pages8
JournalLangmuir
Volume22
Issue number2
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

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Keywords

  • nanoparticles
  • gold
  • gold nanoparticles
  • surface plasmon resonance
  • monolayers
  • Langmuir-Blodgett films
  • optical properties

Cite this

Shan, J., Chen, J., Nuopponen, M., Viitala, T., Jiang, H., Peltonen, J., Kauppinen, E. I., & Tenhu, H. (2006). Optical properties of thermally responsive amphiphilic gold nanoparticles protected with polymers. Langmuir, 22(2), 794-801. https://doi.org/10.1021/la052579q