Fig. 1From: Design of Double-Shelled CuS Nanocages to Optimize Electrocatalytic Dynamic for Sensitive Detection of Ascorbic AcidThe synthetic process of 2-CuS NCs. The inset represents TEM images matched with a Cu2O, b Cu2O@CuS, c Cu2O@CuS@CuS, and d CuS@CuSBack to article page