Nanosphere composite materials are often synthesized using layer-by-layer (LbL) assembly of cationic and anionic polymers onto colloidal nanoparticles (NPs). We investigate the synthesis and characterization of hybrid multilayer-coated gold nanospheres composed of alternating inorganic anionic (polyoxometalates, POMs) and organic cationic (poly(allylamine), polyA) layers. Previous work in POM-stabilized NPs has involved a variety of POM reduction methods. One novel aspect of our approach is reducing in situ the POM, specifically, silicotungstic acid (STA), which subsequently serves as the reducing agent for a gold salt, generating inorganically stabilized AuNPs. The AuNP synthesis is strongly influenced by the reduction conditions for STA, including electrode type, electrolyte, and applied potential. After synthesis of the STA-stabilized core, we deposit two sets of PolyA/STA layers onto the Au core. Data from characterization with UV-Visible spectroscopy (UV-Vis), Zeta potential measurements, dynamic light scattering (DLS), and inductively coupled plasma optical emission spectroscopy (ICP-OES) support this conclusion. UV-Vis spectra show that the addition of PolyA to STA-stabilized AuNPs causes a characteristic redshift from the initial wavelength of approximately 526 nm. DLS data show an increase in size with each full layer addition. ICP-OES data of gold-to-tungsten ratios further confirms successful layering. Zeta-potential data show an alternating positive (45 mV) or negative charge (−40 mV) after the deposition of the cationic or anionic layer, respectively, to the Au core.

Layer-by-layer assembly of polyoxometalate-polymer onto electrochemically generated gold nanospheres

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.