GROWTH MECHANISMS OF GOLD NANOSTRUCTURES

POSTER

Abstract

Gold nanostructures with tetrahedral, hexagonal, icosahedral, decahedral, triangular, and star-decahedral shapes were synthesized in a single step using a polymer by heating HAuCl4-PVP (Polyvinylpyrrolidone) in EG (Ethylene Glycol) solution. In this process, PVP acted as a surfactant controlling the shape of the particles, and EG is a reducing agent obtaining truncated polyhedral particles with different sizes. We studied the growth mechanisms of five-fold nanoparticles and hollow hexagonal particles. The two possible layer-by-layer growth mechanisms are based on nucleation from a five-fold seed and successive growth through the twinning of a truncated tetrahedron. The structural features of the produced nanoparticles were characterized by electron microscopy. TEM, SEM, STEM, and EDS were performed.

*Department of Energy (DOE), Office of Science Mission, Award No. DESC0023343,Mission DAC: Molecular Mechanisms of MoistureDriven DAC within Charged Polymers; the Army Research Office(ARO), PTE Federal Award No. W911NF-23-2-0014, CognitiveDistributed Sensing in Congested Radio Frequency Environments:FREEDOM; the National Science Foundation, SponsorGrant No. 2025490, NNCI: Nanotechnology Collaborative InfrastructureSouthwest (NCI-SW); and the Center for MaterialsInterfaces in Research & Applications (MIRA) at Northern ArizonaUniversity (NAU) for allowing them to use its facilities.

Publication: Kim, F., Connor, S., Song, H., Kuykendall, T., & Yang, P. (2004). Platonic gold nanocrystals. Angewandte Chemie International Edition, 43(28), 3673–3677.
Mori, T., & Hegmann, T. (2016). Determining the composition of gold nanoparticles: A compilation of shapes, sizes, and calculations using geometric considerations. Journal of Nanoparticle Research, 18, 1–36.

Presenters

  • Joelin A Agyei-Mensah

    • Northern Arizona University

Authors

  • Joelin A Agyei-Mensah

    • Northern Arizona University

  • Jesus Velazquez Salazar

    • Northern Arizona University

  • Miguel Yacaman

    • Northern arizona University
    • Northern Arizona University