Dian Ayu Setyorini, Muhamad Allan Serunting, Wa Ode Sri Rizki, Nandang Mufti, Vienna Saraswaty, Muhammad Aziz, Risa Suryana, Wilman Septina, Zulhadjri, Henry Setiyanto
Carbon quantum dots (CQD) have been acknowledged as novel carbon-based materials with distinctive optical properties and excellent performance for detecting cadmium ion (Cd2+). Herein we report a facile synthesis of CQD from a natural source that is Archidendron bubalinum pods (CQDAb) and its application for an electroanalysis of Cd2+. The synthesized CQDAb was found emitting a strong blue fluorescence. Moreover, the synthesized CQDAb showed lower band gap (4.04 eV) than that of CQD synthesized from graphite (6.09 eV). For electroanalysis purposes, the CQDAb was used as a modifier for carbon paste electrode-based reduced-graphene oxide (CPE/r-GO/CQDAb). The composite of rGO/CQDAb could enhance the performance of CPE/CQDAb and CPE/rGO. The prepared CPE/rGO/CQDAb shows a greater linearity for Cd2+ detection when tested using a square wave voltammetry method. These findings clearly show promising results for preparing CQD-based natural source, specifically A. bubalinum pods, and its application for a Cd2+ sensor. © 2025
Analytical Chemistry Research Group, Chemistry Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No. 10, West Java, Bandung, 40132, Indonesia; Biochemistry Research Group, Chemistry Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No. 10, West Java, Bandung, 40132, Indonesia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia; Center of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia; Research Center for Environmental and Clean Technology, National Research and Innovation Agency Republic of Indonesia, KST Samaun Samadikun, Jl. Sangkuriang, Bandung, 40135, Indonesia; Institute of Industrial Science, The University of Tokyo, Tokyo, Japan; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Surakarta, 57126, Indonesia; Research Center for Electronics, National Research and Innovation Agency of Republic Indonesia (BRIN), Bandung, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Andalas, Padang, 25163, Indonesia
