Supporting information

Figure S1 The size distribution of (a) as-spincoated Ag NCs, (b) SCN treated Ag NCs, (c) Au coated Ag NCs and the interparticles distance distribution of (d) as-spincoated Ag NCs

Figure S2 (A) TEM images, (B) EDX data of Au treated, SCN exchanged Ag NCs. STEM images of SCN exchanged Ag NCs after Au treatment for (C) 10 min and (G) 30 min and EDS elemental mapping for (D) and (H) an overlay of the Au and Ag maps, (E) and (I) Au L maps, (F) and (J) Ag K maps, after 10mins and 30min of Au treatments, respectively.

Figure S3 (a) I-V curves for dark (black) and irradiated (red) photodetector with sputtered Au electrodes and (b) after annealing at 180 °C for 1 min