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Calculated averaging effects of the CPD measured by the tip on Au NP versus bulk Au (details in the Supporting Information, sections 7 and 8). (a) Scheme where KPFM is performed on a sample consisting of bulk TiO2 and Au; (b) same for a Au NP on the TiO2 surface. The theoretical modeling predicts a significant reduction on the CPD (δV) in (b) due to the small size of the Au NP with respect to the tip.
