Carbon dots (CDs) signify a rising class of nanomaterials with quite a few optical and physicochemical properties that make them helpful for a wide range of functions. On this work, three completely different strategies, typical hydrothermal carbonization (CHC), microwave-assisted irradiation and heating reflux response approach, had been used as completely different bottom-up approaches to acquire completely different CDs. The carbon nanoparticles had been ready utilizing three completely different carbon precursors (maleic, fumaric and adipic acids) and one nitrogen supply (ethylenediamine). The CDs had been characterised utilizing completely different methods together with Fourier rework infrared spectroscopy, Transmission electron microscopy, Ultraviolet-visible, Fluorescence and Zeta potential measurements. Each, the experimental technique used to acquire the CDs and the completely different precursors, offered a substantial affect on the quantum yield values (QY), and in addition on the fluorescence emission curves. The molar proportion between the carbon and nitrogen supply was diverse to enhance the QY, and one of many samples ready by CHC technique reached QY = 25.4%. The carbon nanoparticles obtained by CHC had been used as nanoprobes for metallic ions and exhibited nice selectivity and sensitivity for Fe3+ ions, reaching a restrict of detection of 35 nM, which is decrease than most reported values for CD-based PL technique used as probes for Fe3+ ions.