Supplementary Material

The supplementary material encompasses three figures and a table. The figures respectively show the fluorescence spectrum of O-CDs, the photos of the O-CDs solution and O-CDs/PVA films under the natural sunlight and UV lamp, and the performance of O-CDs/PVA sensor under different humidity and temperature. In addition, the pressure sensitivity of the reported TENG based sensors has been listed in Table S1.