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)

Research output: Contribution to journalArticleScientificpeer-review

74 Citations (Scopus)


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
Issue number2
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed


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


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