“…One good example of the possible solution is a densely packed AuNP thin film, which is prepared from aqueous colloidal solution of citrate-stabilized AuNPs 21,22) using the liquid-liquid interfacial precipitation [23][24][25] (LLIP) method. 19,20,[26][27][28][29][30] Depending on measurement conditions, densely packed AgNP thin films are also expected to be suitable for SERS application. Because AgNPs have weaker internal transition absorption than that of AuNPs, it can be expected that the conversion loss from light to plasmon is smaller.…”