Figure 3: Atomically resolved STEM images of monodisperse SL POM.

(a–c) HAADF-STEM images of pCNT, SL-CNT and ESD-NaPOM-CNT, respectively. (d,e) The corresponding HAADF STEM images of SL-CNT and ESD-NaPOM-CNT, respectively, (f) Histogram of cluster size distribution in SL-CNT and ESD-NaPOM-CNT, respectively. Approximately 1.5 × 1013 PMo12O40 ions were loaded on the modified CNT electrodes. Selected examples of intact SL POM clusters were mapped in d—red circles. Note: The raw STEM images were processed using the Gatan Microscopy Suite DigitalMicrograph software to generate colour-enhanced Z-contrast images.