Berlin 2008 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: POSTERS Colloids, Nanoparticles and Aggregates

CPP 21.26: Poster

Wednesday, February 27, 2008, 16:00–18:30, Poster A

Nanorod-coated PNIPAM microgels: thermoresponsive optical properties — •Matthias Karg¹, Isabel Pastoriza-Santos², Jorge Pérez-Juste², Luis M. Liz-Marzán², and Thomas Hellweg³ — ¹TU Berlin, Stranski-Laboratorium, Strasse des 17. Juni 124, 10623 Berlin, Germany — ²Universidade de Vigo, Grupo de Quimica Fisica, 36310 Vigo, Spain — ³Universität Bayreuth, Physikalische Chemie I, Universitätsstrasse 30, 95440 Bayreuth

Highly-charged, thermoresponsive poly-(N-isopropylacrylamide) microgels were covered with polyelectrolyte-coated gold nanorods [1]. The surface coverage of these hybrid particles was varied by changing the ratio of nanorods to microgel and determined from electron microscopy images. Temperature dependent UV-VIS measurements were done to investigate the optical behavior during the collapse of the microgel core. The results show red-shifts of the longitudinal plasmon band due to increasing electronic interactions between the gold nanorods when the polymer cores decrease in size. Further observed effects are an increase in the band width and a decrease of the amplitude of the longitudinal band. These properties strongly depend on the surface coverage and are therefore tuneable, which makes them interesting for applications such as optical filters. [1] M. Karg, I. Pastoriza-Santos, J. Pérez-Juste, T. Hellweg, L. M. Liz-Marzán, Small, 2007, 3, 1222-1229