THE EFFECT OF HYDROTHERMAL TEMPERATURE AND TIME OF UREA-DOPING ON THE OPTICAL PROPERTIES OF LEMONGRASS-BASED CARBON DOTS

CDs sourced from spiced lemongrass have been produced by hydrothermal method at temperatures of 120 ℃, 140 160 ℃ and 180 ℃. The addition urea as a nitrogen source was carried out in the synthesis carbon nanoparticles temperature for two hours three to see effect on optical properties CDs. gave different But energy band gap (Eg) becomes narrower. For duration, showed significant increase absorbance, but decrease fluorescence intensity, whereas hours, it resulted an intensity. results measuring size distribution peak value 52.32 nm. Functional group analysis using FTIR spectrometer that consisted C=C, C-O, O-H,