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. 2020 Sep 2;221:121615. doi: 10.1016/j.talanta.2020.121615

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Fig. 2 — Various methods for IOs synthesis. Fabrication of a) ZnO IOs using spin coating [59] b) TiO₂ IOs using sol/gel c) IOH photopolymerization. Copyright 2009, Elsevier. Reproduced from Ref. [80]. Copyright 2010, Elsevier. Reproduced from Refs. [78], IOs: Inverse opals, ZnO: Zinc oxide, TiO₂: Titanium dioxide.