Sn-doped In2O3 NCs of different sizes and doping percentages were synthesized following the slow-injection synthetic procedure developed by the Hutchison group. In brief, on a standard Schlenk line apparatus, In and Sn precursor in a desired stoichiometric ratio were dispersed in oleic acid to yield a 0.5 M solution and this mixture was degassed at 100 C under vacuum conditions. This was followed by an undisturbed heating at 150 C and constant stirring under N2 atmosphere for 2 hours. Using a syringe pump, different volumes of this mixture were subsequently injected at the rate of 0.35 mL/min into different flasks containing 13 mL oleyl alcohol kept at 290 • C (under N2 conditions). Injection of different volumes yielded NCs with a constant doping percentage but different sizes. Synthesized NCs were separated from the reaction mixture by repeated precipitation with anti-solvent ethanol, centrifugation at 9000 rpm for 5 min, and redispersing in hexane before finally being prepared as a colloidal dispersion of NCs in hexane.