Hydrophobically modified polyelectrolytes used as reducing and stabilizing agent for the formation of gold nanoparticles |
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Authors: | Carine Note Joachim Koetz Sabine Kosmella Brigitte Tiersch |
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Institution: | 1. Institut für Chemie, Universit?t Potsdam, Karl-Liebknecht-Strasse 24–25, Haus 25, 14476, Potsdam-Golm, Germany
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Abstract: | This paper is focused on the synthesis and characterization of hydrophobically modified polyelectrolytes and their use as
reducing as well as stabilizing agents for the formation of gold nanoparticles. Commercially available poly(acrylic acid)
has been hydrophobically modified with various degrees of grafting of butylamine introduced randomly along the chain. Different
analytical methods are performed, i.e., IR and 1H-NMR spectroscopy in combination with elemental analysis to determine the degree of grafting. The modified polymers can successfully
be used for the controlled single-step synthesis and stabilization of gold nanoparticles. The process of nanoparticle formation
is investigated by means of UV-vis spectroscopy. The size and shape of the particles obtained in the presence of unmodified
or modified polyelectrolytes are characterized by dynamic light scattering, zeta potential measurements and transmission electron
microscopy. The polyelectrolytes were involved in the crystallization process of the nanoparticles, and in the presence of
hydrophobic microdomains at the particle surface, a better stabilization at higher temperature can be observed. |
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Keywords: | Hydrophobically modified polyelectrolytes Gold nanoparticles |
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