“…The characteristic peaks at 682, 1146, and 1460 cm À 1 correspond to ZIF-8 methyl and imidazole ring vibrations, Z n À N stretching, imidazole ring CÀ N stretching, and methyl bending, which proves that ZIF-8 is successfully synthesized on SiO 2 surface. [31] Figure 6(b) is the infrared spectrum of mSiO 2 @CUR before and after the mSiO 2 @ZIF-8@CUR functionalization modification. In the mSiO 2 @ZIF-8@CUR spectrum, 3356, 3053, 2927, 2361, 1508, 1184, 1200, and 893 cm À correspond to phenolic hydroxyl stretch, aromatic CÀ H stretch, aliphatic CÀ H stretch, CÀ C stretch, CÀ N stretch, CÀ O stretch, CÀ O-C stretch, and CÀ C stretch, respectively.…”