Gold nanoparticles (GNPs) have a wide range of properties with potential applications in electronics, optics, catalysis, and sensing.  In order to create stable and portable samples for these applications, multiple layers of polyelectrolytes and gold nanoparticles were assembled on glass substrates by electrostatic layer-by-layer (LBL) techniques.  Four polymers (poly(diallyldimethylammonium chloride) (pDADMAC), polyvinylpyrrolidone (PVP), polyethyleneimine (PEI), and poly(sodium 4-styrene sulfonate) (PSS)) with positive or negative charge and four different size and shape gold nanoparticle (spherical, rod, prism, and octahedral) were used.  Citrate capped spherical gold nanoparticles were synthesized with a 19 nm diameter.  Rod gold nanoparticles were synthesized using cetyltrimethyl ammonium bromide (CTAB) with a length of 100 nm.  Triangular prismatic gold nanoparticles were synthesized with L-<i>alpha</i>-phosphatidylcholine (PC, from soybean, type IV-S, 30%) with a length of 90 nm.  Octahedral gold nanoparticles were synthesized using pDADMAC and phosphoric acid with an edge length of 50 nm.  Each polyelectrolyte was used to assemble LBLs with each gold nanoparticle shape.  Gold nanoparticles and LBLs were characterized via dynamic light scattering (DLS), UV-vis spectroscopy, transmission and scanning electron microscopy (TEM and SEM), and atomic force microscopy (AFM).  Binding and sensing applications were detected by measuring the localized surface plasmon resonance (LSPR) of the GNPs.

Layer-by-layer assembly of polyelectrolytes and different size and shape gold nanoparticles<br />

249th National Meeting (2015)

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