Fig. 2From: Designing of robust and sensitive assay via encapsulation of highly emissive and stable blue copper nanocluster into zeolitic imidazole framework (ZIF-8) with quantitative detection of tetracyclineA Fluorescence emission spectra of (a) CuNCs@ZIF-8, (b) CuNCs alone. The inset image shows the digital photographs of (right) pure CuNCs@ZIF-8, (left) CuNCs@ZIF-8 under ultraviolet light of 365Â nm. B Absorption spectra of (a) CuNCs@ZIF-8, (b) CuNCs both of them the absorption spectrum at 364Â nmBack to article page