Fig. 4 | Nature Communications

Fig. 4

From: Controlling the fluorescence and room-temperature phosphorescence behaviour of carbon nanodots with inorganic crystalline nanocomposites

Fig. 4The alternative text for this image may have been generated using AI.

Exploring the impact of host phase synthesis and carbon nanodot (CND) precursors on photoluminescent (PL) behaviour. Photographs with, and immediately after the removal of, UV (365 nm) excitation of folic acid-derived CND (F-CND) nanocomposites with a amorphous CaCO3 (amorphous calcium carbonate (ACC)) and b calcite (CaCO3) nanoparticles, and c riboflavin–derived CND (R-CND) nanocomposites with SrSO4. Powder X-ray diffraction (pXRD) patterns of d ACC and e CaCO3 nanoparticles, where the peaks are indexed to calcite. Scanning electron microscopy (SEM) micrographs of nanocomposites are given as insets. (f) Steady-state photoluminescence (SS-PL) emission spectra (λex = 320 nm) for ACC (purple) and CaCO3 nanoparticles (cyan) (Calcite (λex = 320 nm, black), where the SS-PL spectrum is given for comparison. g Video stroboscopy decay plots for F-CND/ACC (purple circle) and F-CND/CaCO3 nanoparticles (cyan inverted triangle)(F-CND/calcite (black square) given for comparison). h SS-PL emission spectra (λex = 380 nm) of R-CND/CaSO4 2H2O (dotted black), R-CND/SrSO4 (dotted red) and R-CND/BaSO4 (dotted blue). i Time-resolved phosphorescence microscopy (TRPM) lifetime measurements for R-CND/inorganic host nanocomposites compared with host density (carbonates (black squares) and sulphates (red circles)). The outlier is R-CND/SrSO4. Scale bars: 500 nm (d) and 300 nm (e)

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