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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Kimia Universitas Brawijaya Science and Technology Indonesia Makara Journal of Science
Elvina Dhiaul Iftitah
Department of Chemistry, University of Brawijaya, Jl. Veteran, Malang
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science Materials Science & Nanotechnology Physics

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Synthesis and Optical Properties of Carbon Quantum Dots Based on Terung Dayak (Solanum Ferox) Fruit Juice as Antioxidant and Metal Ion Sensor Ariefin, Mokhamat; Pasaribu, Marvin Horale; Manurung, Tety Wahyuningsih; Hakim, Muh. Supwatul; Iftitah, Elvina Dhiaul; Suma, Joy Angel Aria; Cahyani, Risfiah Ruli
Jurnal Kimia Sains dan Aplikasi Vol 28, No 4 (2025): Volume 28 Issue 4 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.4.176-182

Abstract

Carbon dots (CDs) are a novel class of carbon-based nanomaterials with diverse applications due to their biocompatibility, optical properties, and chemical stability. This study aims to synthesize CDs from Terung Dayak (Solanum ferox) using a microwave-assisted method and evaluate their optical properties, metal ion sensing capability, and antioxidant activity. The CDs were synthesized with variations in microwave power and citric acid concentration, specifically: CD-a using 1 g citric acid at 600 W, CD-b using 2 g citric acid at 600 W, CD-c using 3 g citric acid at 600 W, and CD-d using 2 g citric acid at 800 W, and then characterized using UV-Vis and fluorescence spectroscopy. The results revealed strong UV absorption with maximum peaks at 250 nm for all CDs synthesized and 275 nm for CD-d, depending on synthesis conditions. The CDs exhibited fluorescence intensity influenced by microwave power, with the highest intensity observed for CDs synthesized at 800 W and 2 g of citric acid. The optical bandgap from UV-Vis spectra, determined via Tauc plot analysis, ranged from 4.03 eV to 4.71 eV, indicating quantum confinement effects for all CDs. Furthermore, CD-d demonstrated selective fluorescence quenching for Fe3+ ions, which quenched the fluorescence of the CD. Antioxidant activity was confirmed via 2,2-diphenyl-1-picryhydrazyl (DPPH) radical scavenging, with an IC50 value of 126 ppm for CD-d. These findings highlight the potential of Terung Dayak-derived CDs as multifunctional materials for sensing and antioxidant applications.
Co-Authors A.A. Ketut Agung Cahyawan W Cahyani, Risfiah Ruli Damiana Nofita Birhi Hakim, Muh. Supwatul Hidayatul Mustafidah Indah Nur Pramesti Khoirun Nisyak Marvin Horale Pasaribu Moh. Farid Rahman Mokhamat Ariefin Pertiwi, Gilly Putri Pratama, Safreno Panggih Putri, Aufy Nuraini Rachmat Triandi Tjahjanto Siti Mariyah Ulfa Soesantyo, Adi Kurnia Suma, Joy Angel Aria Suratmo Suratmo Tety Wahyuningsih Manurung Warsito Warsito Wulandari, Ivtarina