Prameswara, Cindy Firda (2026) Eksplorasi Green Synthesis Partikel Emas Menggunakan Agen Pereduksi Ampas Kopi Untuk Aplikasi Sensor Surface Plasmon Resonance (Spr). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penggunaan material ramah lingkungan dalam pengembangan sensor optik berbasis Surface Plasmon Resonance (SPR) menjadi penting seiring meningkatnya perhatian terhadap teknologi berkelanjutan. Limbah ampas kopi merupakan biomassa yang melimpah dan kaya senyawa polifenol, namun pemanfaatannya dalam teknologi material masih terbatas. Penelitian ini bertujuan untuk memanfaatkan ampas kopi sebagai agen pereduksi alami dalam proses green synthesis partikel emas serta aplikasinya pada sensor SPR. Ampas kopi robusta dipreparasi melalui proses karbonisasi pada suhu 200°C, 400°C, 600°C, dan 800°C selama 5 jam, kemudian diekstraksi menggunakan etanol. Sebagai pembanding, ampas kopi arabika diekstraksi tanpa proses karbonisasi menggunakan pelarut DI water. Ekstrak yang diperoleh direaksikan dengan prekursor HAuCl₄ untuk mensintesis partikel emas. Karakterisasi dilakukan menggunakan UV–Visible, FTIR, dan Particle Size Analyzer (PSA), serta diuji integrasinya ke dalam sistem sensor SPR. Hasil UV–Visible menunjukkan bahwa ekstrak ampas kopi robusta tanpa pemanasan dengan metode ekstraksi etanol paling efektif dalam mereduksi ion Au³⁺ menjadi Au⁰, ditandai dengan puncak serapan Surface Plasmon Resonance pada rentang 520–550 nm. Analisis FTIR mengonfirmasi keberadaan gugus –OH dan ikatan karbon tak jenuh (C=C/C=O) yang berperan sebagai agen pereduksi dan penstabil partikel emas, sedangkan hasil PSA menunjukkan distribusi ukuran partikel yang relatif homogen. Integrasi partikel emas ke dalam sensor SPR meningkatkan sensitivitas sensor. Penelitian ini menyimpulkan bahwa ampas kopi robusta berpotensi sebagai material aktif ramah lingkungan untuk pengembangan sensor optik berbasis SPR.
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The use of environmentally friendly materials in the development of Surface Plasmon Resonance (SPR)-based optical sensors has become increasingly important in line with the growing emphasis on sustainable technology. Spent coffee grounds are an abundant biomass rich in polyphenolic compounds; however, their utilization in material technology remains limited. This study aims to utilize spent coffee grounds as a natural reducing agent in the green synthesis of gold particles and to investigate their application in SPR sensors. Robusta coffee grounds were prepared through a carbonization process at temperatures of 200°C, 400°C, 600°C, and 800°C for 5 hours, followed by ethanol extraction. As a comparison, Arabica coffee grounds were extracted without carbonization using deionized (DI) water as the solvent. The obtained extracts were reacted with HAuCl₄ precursor to synthesize gold particles. Characterization was carried out using UV–Visible spectroscopy, FTIR, and Particle Size Analyzer (PSA), followed by integration testing within an SPR sensor system. The UV–Visible results indicated that the non-carbonized robusta coffee extract obtained via ethanol extraction was the most effective in reducing Au³⁺ ions to Au⁰, as evidenced by the Surface Plasmon Resonance absorption peak in the range of 520–550 nm. FTIR analysis confirmed the presence of –OH functional groups and unsaturated carbon bonds (C=C/C=O), which act as reducing and stabilizing agents for the gold particles, while PSA results showed a relatively homogeneous particle size distribution. The integration of the gold particles into the SPR sensor enhanced its sensitivity. This study concludes that robusta coffee grounds have strong potential as an environmentally friendly active material for the development of SPR-based optical sensors.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Green synthesis, partikel emas, ampas kopi, FTIR, PSA, sensor SPR, Green synthesis, gold nanoparticles, coffee waste, FTIR, PSA, SPR sensor |
| Subjects: | Q Science > QC Physics > QC1 Dielectrics Q Science > QC Physics > QC389 Light--Transmission--Mathematical models. Q Science > QC Physics > QC451 Spectroscopy Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD117.S64 Spectrophotometry |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Cindy Firda Prameswara |
| Date Deposited: | 20 Jul 2026 01:44 |
| Last Modified: | 20 Jul 2026 01:45 |
| URI: | http://repository.its.ac.id/id/eprint/135639 |
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