Fig. 1.

Schematic demonstration of the site-specific ED growth of PS-Ag Janus particle array and the net-like array. (A) MCC template. (B) After thermal evaporation of the Au film. (C) Ag was electro-deposited on the Au covered area, giving rise to the formation of PS-Ag Janus particle array and the net-like array in a single ED growth process. (D) The prepared PSAg Janus particle array shows a superhydrophobic property. (E) During water evaporation, concentration of the molecules in the droplet increases. (F) Molecules are delivered to a localized area, facilitating subsequent SERS detections. This concept is called superhydrophobic surface enhanced Raman scattering, or SSERS.