Optical properties of thermally responsive amphiphilic gold nanoparticles protected with polymers

Jun Shan, Jie Chen, Markus Nuopponen, Tapani Viitala, Hua Jiang, Jouko Peltonen, Esko Kauppinen, Heikki Tenhu*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

70 Citations (Scopus)

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 - 17 Jan 2006
MoE publication typeA1 Journal article-refereed

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