CVs of films of Cd-bound PPA (dashed red), Cd-bound MPA (dashed black), PPA-capped CdS QDs (solid red), and MPA-capped CdS QDs (solid black). The solvent background is in blue. All measurements were done with 0.1 M NBu4PF6 as the supporting electrolyte, at a scan rate of 0.1 V/s, with a glassy carbon working electrode, a Pt wire counter electrode and Ag wire reference electrode. CVs were shifted to the SCE scale using Fc/Fc+ (= 0.342 V vs. SCE) as a standard, see the Supporting Information. The black arrows show the scan direction used for all samples.