Sintesis dan Karakterisasi Nitrogen Carbon Dots Berbasis Cangkang Biji Karet (Havea brasiliensis) Menggunakan Metode Hidrotermal dengan Variasi Massa Dopan

Abstract

Carbon Dots (CDs) are zero-dimensional carbon nanomaterials with a size of less than 10 nm that have high fluorescence properties and good stability. Efforts to improve fluorescence efficiency and stability can be done through modification of the surface of CDs, one of which is by adding heteroatomic dopant such as Nitrogen. In this study, the synthesis and characterization of Nitrogen Carbon Dots (N-CDs) from rubber seed shells as a precursor was carried out using hydrothermal methods at a temperature of 180oC for 16 hours with the addition of urea as a source of Nitrogen dopant with mass variations of 1, 3, and 5 g. The results of this study show that N-CDs have been successfully synthesized which is characterized by a blue glow under a 365 nm UV lamp. The FTIR spectrum shows the presence of groups O-H, C-H, C=O, C=C, C-O, as well as N-H and C-N which indicate that Nitrogen has successfully been doped on the surface of carbon dots. Photoluminescence analysis on urea variations of 1, 3, and 5 g had emission peaks of 450 nm, 420 nm, and 420 nm, respectively. UV-Vis analysis on urea variations of 1, 3, and 5 g had an absorption peak of 218 nm and 280 nm, respectively; 234 nm and 312 nm; and 232 nm and 310 nm, as well as gap energy values of 3.18 eV, 3.07 eV, and 3.10 eV, respectively. The quantum yield values in N-CDs of urea variation 1, 3, and 5 g were 36.7047%, 48.7493%, and 35.6224%, respectively. TEM analysis of the 3 g urea variation showed spherical particles with an average particle size distribution of 2.8 nm. The results of this study show that rubber seed shells have the potential to be a precursor in the synthesis of N-CDs, with 3 g of urea dopant providing maximum quantum yield values and minimum gap energy values.