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Schematic diagram of the preparation of CaO2@HMSNs-PAA. HMSNs were obtained through a structural difference-based selective etching approach (TEOS, tetraethyl orthosilicate; CTAB, cetyltrimethylammonium bromide; EtOH, ethanol). Then, 3-aminopropyl triethoxysilane (APTES) was conjugated onto the surface of HMSNs to form the amino-functionalized HMSNs (HMSNs-NH2). Finally, CaO2@HMSNs-PAA was fabricated by CaO2 loading and polyacrylic acid (PAA) coating.
