Fig. 7. (A) t1/2,[NC]/t1/2,rxn as a function of temperature for a range of N,N′-4-substituted-phenyl-dodecylthioureas and N,N′-alkyl-dodecylthioureas. The grey area represents reactions where t1/2,[NC] < 2 s. (B) FWHM and exciton energy plotted for a series of PbS nanocrystals synthesized at 80–140 °C. The intrinsic FWHM of a single size is shown for several PbS sizes (white circles). A fit to the intrinsic FWHM points (black line) is shown to compare with smaller final PbS sizes (FWHM = AeBx, A = 73.8, B = 2.33, x = first excitonic transition energy). The band gap energy of bulk PbS is shown as a dashed black line.
