Fig. 1. (A) TEM characterization of CuS-CTAB, inset in (A): DLS of CuS-CTAB in aqueous solution. (B) TEM characterization of the CuS@mSiO₂ NPs, inset in (B): DLS of the CuS@mSiO₂ NPs. (C) Magnified TEM image of the CuS@mSiO₂ NPs. (D) Agarose gel electrophoresis demonstrating the construction procedure of the Y-motif DNA structure (G1: Ya and Yc; G2: Ya, Yc and Yd; G3: Ya, Yb, Yc and Yd). (E) UV-vis spectra of CuS@mSiO₂-SH, CuS@mSiO₂-SH/ATP, CuS@mSiO₂-Y, and CuS@mSiO₂-Y/ATP.