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All Journal Indonesian Physical Review
Azfa Restu Putra
Physics Education Department, Faculty of Teacher Training and Education, Universitas Sultan Ageng Tirtayasa
Education Physics

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MICROWAVE-ASSISTED GREEN SYNTHESIS OF CARBON DOTS DERIVED FROM MELON PEEL WASTE AS AN ECO-FRIENDLY FLUORESCENT SENSOR FOR Fe³⁺ CONTAMINATION Rahmat Firman Septiyanto; Azfa Restu Putra; Yudi Guntara
Indonesian Physical Review Vol. 9 No. 3 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i3.594

Abstract

This research successfully demonstrates the valorization of melon peel waste into fluorescent carbon dots (CDs) using a straightforward microwave-assisted synthesis method. The synthesized CDs were comprehensively characterized, revealing optimal optical properties for sensing applications. Ultraviolet-visible spectroscopy revealed characteristic absorption peaks at 260 nm and 305 nm, corresponding to the carbon core and surface functional groups, respectively. Furthermore, photoluminescence spectroscopy under 245 nm excitation showed a strong blue emission peak at 453 nm. The practical utility of these nanoparticles was confirmed through their application as a fluorescent sensor for Fe³⁺ ions. The interaction resulted in significant fluorescence quenching and a distinct blue shift of the emission peak to 448 nm, indicating high sensitivity and a strong quenching response, leading to a ~67% decrease in emission intensity. These findings confirm that melon peel-derived CDs are a promising, eco-friendly material for developing effective probes for detecting heavy metals in environmental monitoring.
Co-Authors Rahmat Firman Septiyanto Yudi Guntara