SYNTHESIS OF CARBON DOTS FROM BANANA’S PEDUNCLE AND ITS ANTIBACTERIAL ACTIVITY AGAINST XANTHOMONAS ORYZAE PV. ORYZAE (XOO)

• Main Author: Hari, Ivony
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71667
• Institution: Institut Teknologi Bandung

Bacterial leaf blight (HDB) on rice caused by Xanthomonas oryzae pv. oryzae (Xoo) can attack all phases of rice growth and cause yield losses of up to 40%. Antibacterial substances that are non-toxic and biodegradable can overcome HDB disease. One alternative antibacterial substance is carbon dots (c-dots). This research focuses on synthesizing c-dots from a banana’s peduncle biomass residue as an antibacterial material. C-dots were synthesized by microwave and hydrothermal methods. Transmission Electron Microscopy (TEM) images show that c-dots have been successfully synthesized with spherical shapes and particle sizes from 1.7 nm to 6 nm. The diffraction pattern results showed that the resulting c-dots had a poly-nanocrystalline structure with lattice gap widths between 0.105 nm and 0.109 nm. The photoluminescence properties of c-dots were evaluated by irradiating UV light with an excitation wavelength of 420 nm, resulting in an emission wavelength of 519-520 nm. The resulting glow is bluish green. Functional group analysis with Fourier Transform Infra-Red (FTIR) showed that the c-dots had the functional group O-H at 3415 nm-1, C-H at 2960 nm-1, and C=O at 1634 nm-1. The antibacterial properties of c-dots were evaluated using the Total Plate Count (ALT) method. C-dots show up to 95% reduction of bacterial colonies. C-dots synthesized by hydrothermal method had better antibacterial properties than c-dots produced by microwave. This study's results indicate that c-dots can be used as an alternative antibacterial substance to treat HDB disease.