Chemical Physics Letters, Vol.721, 123-128, 2019
Alpha-fluorescence (alpha S-1) from thermally stable carbon nanodots
Fluorescence from carbon nanodots has been of keen interest over the past decade; however, exploration of radiative pathways including delayed fluorescence (alpha S-1) from nanodots have hitherto seen little investigation, thus limiting the scope of nanodot applications. Simple synthesis strategies for alpha S-1-emitting nanodots therefore remain necessary. Herein we report an inexpensive, quasi-spherical nanodot structure from combustion-based synthesis exhibiting strong excitation-dependent alpha S-1 emission upon aggregation to 100 nm sizes. Interestingly, alpha S-1 emission intensity is found to increase with increased temperature. The nanodots also exhibit photostability over multiple heating and cooling cycles, suggesting the possible use of these carbon nanodots as temperature-sensitive luminescence probes.