Retardation of shape change of Au nanorods using photo-cross-linkable ligands |
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| Authors: | Scott P. O. Danielsen Jihoon Choi Russell J. Composto |
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| Affiliation: | 1. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104;2. Department of Materials Science and Engineering, Chungnam National University, Daejeon, South Korea |
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| Abstract: | The thermal reshaping of gold nanorods has been slowed by grafting a diblock copolymer [P(S-b-S-N3)] containing an outer polystyrene (PS) brush and a short, inner photo-cross-linkable PS-azide block. The P(S-b-S-N3)-Au NRs were dispersed in a PS thin film and reshaping was investigated using scanning electron microscopy and UV–Vis spectroscopy. For P(S-b-S-N3)-Au NRs in PS, the longitudinal surface plasmon resonance decreased from about 880 toward 750 nm upon annealing at 100 °C, 150 °C, and 200 °C. This blue shift increased in strength as temperature increased. However, this reshaping of P(S-b-S-N3)-Au NRs was slower than that of Au NRs grafted with a poly(ethylene glycol) brush that was dispersed in poly(methyl methacrylate). By slowing down reshaping at elevated temperature, polymer thin film devices that heat during use (e.g., polarization dependent filters) can exhibit a longer lifetime. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 301–307 |
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| Keywords: | nanorods nanocomposites polymers thermal reshaping thin films |
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