Each panel depicts the RDFs with respect to the AuNP center for relevant groups in the AuNP+ (Figure 3a) and AuNP– (Figure 3b) solutions. The size (diameter) of the Au-rich part is d = 1.82 nm, and the average overall diameter is 4.06 and 4.13 nm for AuNP+ and AuNP–, respectively, including the alkanethiol chains and terminal groups.