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All Journal Jurnal Kimia Riset
Eduwin Saputra
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Bengkulu, Jl. Wr. Supratman Kandang Limun, Muara Bangka Hulu 38371, Bengkulu, Indonesia
Chemistry

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Sonochemical Synthesis of Gold Nanoparticles as A Digital Image-Based Colorimetric Probe for Aluminum Ion Detection Eduwin Saputra; Sri Juari Santosa
Jurnal Kimia Riset Vol. 11 No. 1 (2026): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkimris.v11i1.79796

Abstract

Gold nanoparticles functionalized with ethylenediaminetetraacetic acid (EDTA-AuNPs) were successfully synthesized using a sonochemical approach. The synthesis results show a characteristic red color with a SPR peak at 524 nm. The addition of Al³⁺ ions induces a color change in EDTA-AuNPs to blue with a new absorption peak at 700 nm, indicating nanoparticle aggregation. Transmission electron microscopy data confirmed that EDTA-AuNPs particles were dispersed and aggregated after reacting with Al³⁺. Particle size analysis (PSA) confirmed an increase in particle diameter from 27 nm to 161 nm after the addition of Al³⁺. The colorimetric sensor exhibited high selectivity toward Al³⁺ ions. The quantitative analysis was conducted using both UV-Visible spectrophotometry and colorimeter methods. The UV-Visible spectrophotometer method has a detection limit of 0.15 mM, while the colorimeter shows a sensitivity of 0.07 mM. The integration of digital image-based colorimeter methods enables the development of a portable, sensitive, low-cost, and simple platform for on-site detection of Al³⁺ ions.
Co-Authors Sri Juari Santosa