Structure and reactivity of super atom gold clusters depends on the electronic interaction between core gold atoms and the ligand. The super atom clusters of the dimension 1.1 nm containing 25 atoms of gold and 18 ligands, can be of two shapes - spherical (icosahedral; comprised of core and shell gold; made of thiol (SR) ligands; Au25-i) and rod shaped (bi-icosahedral; comprised of core and bridging gold atoms; made of SR and triphenlyphosphine (PPh3) ligands; Au25-bi). Both clusters are photoluminescent (PL) but Au25-bi has higher quantum yield. In this project we push the loading of chromphores on the nanoparticle surface and compare the changes in PL as a function of geometry. Ground state electron transfer is monitored via voltammetry to investigate the direction of electron flow. The influence of the chromophore (modified and anthracene) will be ascertained by two-photon cross-sectional measurements and steady state measurements.

Comparing the optical properties of Au25 icosohedral and bi-icosohedral clusters

2019 Spring National Meeting

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