Figure 4
From: Covalent Epitope Decoration of Carbon Electrodes using Solid Phase Peptide Synthesis
Proposed model of quantum dot surface potential generation. Optical excitation of quantum dot results in asymmetric charge distribution, with positive charge redistributed towards the center of the quantum dot and increased negative charge on the surface. This induces polarization in the linker molecules and graphite surface, with positive charge flow toward the quantum dot, resulting in measurable transient potential difference between graphite electrode and ground. Deexcitation of quantum dot restores original charge distribution, leading to positive charge flow away from the quantum dot and a transient potential difference in the reverse direction.
