THE EFFECT OF BASE DURING THE HYDROTHERMAL SYNTHESIS ON THE PHOTOPHYSICAL PROPERTIES OF HUMIC ACID-BASED CARBON DOTS Lilis Rosmainar (1), Rasidah (1), Dyah Ayu Pramoda Wardani (1), Irzaman (2), and Noviyan Darmawan (3,4*)
1) Department of Chemistry, Palangka Raya University, Indonesia
2) Department of Physics, Bogor Agricultural University, Indonesia
3) Department of Chemistry, Bogor Agricultural University, Indonesia
4) Halal Science Center, LPPM, Bogor Agricultural University, Indonesia
*noviyandarmawan[at]apps.ipb.ac.id
Abstract
In this study, we report the synthesis of highly emitting carbon dots by utilizing humic acid as a green, abundant, and renewable carbon source. The humic acid was isolated from the Central Kalimantan Peatland. The carbon dots were prepared using a hydrothermal method with different types and concentrations of base. The structural characterization of synthesized carbon dots was conducted with transmission electron microscopy, Raman, and infra-red spectroscopy. Based on UV-Vis and fluorescence studies, the photophysical properties of the carbon dots were significantly influenced by the base, and the suggested mechanism was also examined.
