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A single particle‐based confocal laser scanning microscopy was developed for the visual detection of copper ions in confined space. A fluorescence microparticle, named AuNCs/ZIF‐8, was synthesized by coating gold nanoclusters (AuNCs) onto the outer surface of zeolitic imidazolate framework‐8 (ZIF‐8). The morphology and solid‐state fluorescence property of AuNCs/ZIF‐8 were characterized by scanning...