Figure 3.

(a) Measured ET rates from CdSe QDs of various sizes to molecularly linked TiO₂ as a function of ΔG illustrate the exponential dependence predicted by Eq. (1). Reproduced with permission from Ref. [106]. Copyright 2007, ACS. (b) Measured ET rates from CdSe QDs of various sizes to three metal oxides as a function of ΔG. Due to increased electronic coupling and the density of metal oxide acceptor states, the rate of ET demonstrates an exponential dependence on ΔG for lower values of ΔG, but transitions to a non-exponential dependence at higher values of ΔG. Adapted with permission from Ref. [108]. Copyright 2011, PNAS.