Rekayasa Pelapisan Agnps Hasil Green Synthesis Terhadap Sensitivitas Berbasis Surface Plasmon Resonance Melalui Efek Localized Surface Plasmon Resonance

Wachid, Cherry Januar Rahma Putri (2025) Rekayasa Pelapisan Agnps Hasil Green Synthesis Terhadap Sensitivitas Berbasis Surface Plasmon Resonance Melalui Efek Localized Surface Plasmon Resonance. Other thesis, Institut Teknologi Sepuluh November.

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh lapisan nanopartikel perak (AgNPs) hasil green synthesis terhadap karakteristik resonansi permukaan pada sensor Surface Plasmon Resonance (SPR) berbasis prisma BK7 berlapis thin-film emas untuk meningkatkan sensitivitas. AgNPs disintesis menggunakan selulosa eceng gondok sebagai pereduktor dan penstabil, dengan perlakuan awal NaOH 2% dan 5% untuk variasi proses isolasi selulosa eceng gondok. Karakterisasi FTIR menunjukkan gugus fungsi -OH yang mengindikasikan keterlibatan gugus hidroksil dalam proses reduksi ion Ag⁺ menjadi Ag⁰. Hasil Particle Size Analyzer (PSA) memperlihatkan bahwa AgNPs 2% memiliki ukuran partikel lebih kecil dengan distribusi ukuran partikel lebih rendah dibandingkan AgNPs 5%. Hal ini dibuktikan oleh hasil uji Vis-spektrofotometri yang menampilkan puncak absorbansi pada panjang gelombang 430-450 nm sebagai bukti terbentuknya nanopartikel perak. Lapisan AgNPs kemudian diaplikasikan pada permukaan film emas menggunakan metode spray coating dengan variasi jumlah lapisan sebanyak lima kali pelapisan untuk setiap sampel. Pengukuran SPR dilakukan menggunakan konfigurasi Kretschmann. Hasil kurva SPR menunjukkan bahwa pelapisan AgNPs 2% menghasilkan dip resonansi yang lebih tajam dan stabil hingga pelapisan ke-3, sedangkan AgNPs 5% menunjukkan pelebaran dip dan peningkatan noise yang lebih signifikan akibat ukuran partikel yang lebih besar dan kecenderungan aglomerasi. Pergeseran sudut SPR (ΔθSPR) menunjukkan peningkatan seiring bertambahnya jumlah lapisan, dengan nilai pergeseran yang lebih kecil untuk AgNPs 2% dan lebih besar untuk AgNPs 5%. Perbedaan ini berkaitan dengan kemampuan masing-masing lapisan dalam memperkuat osilasi elektron permukaan serta tingkat homogenitas lapisan nanopartikel. Sehingga, dari penelitian ini menunjukkan bahwa modifikasi film emas dengan AgNPs hasil green synthesis mampu mempengaruhi posisi dan karakteristik kurva SPR yang dihasilkan. AgNPs 2% memberikan respons resonansi yang lebih stabil, sedangkan AgNPs 5% menghasilkan pergeseran sudut lebih besar namun dengan kualitas kurva yang menurun.
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This study aims to investigate the effect of green-synthesized silver nanoparticle (AgNP) layers on surface resonance characteristics in a Surface Plasmon Resonance (SPR) sensor based on a BK7 prism coated with a gold thin film in order to enhance sensitivity. AgNPs were synthesized using water hyacinth cellulose as a reducing and stabilizing agent, with 2% and 5% NaOH pretreatments applied to vary the cellulose isolation process. FTIR characterization revealed the presence of -OH functional groups, indicating the involvement of hydroxyl groups in the reduction of Ag⁺ ions to Ag⁰. Particle Size Analyzer (PSA) results showed that AgNPs synthesized with 2% NaOH exhibited smaller particle sizes and a narrower size distribution compared to those synthesized with 5% NaOH. This finding was supported by UV-Vis spectrophotometry results, which displayed absorbance peaks in the wavelength range of 430-450 nm, confirming the formation of silver nanoparticles. The AgNP layers were subsequently deposited onto the gold film surface using a spray-coating method with variations in the number of coating layers up to five layers for each sample. SPR measurements were performed using the Kretschmann configuration. The SPR curves indicated that AgNPs synthesized with 2% NaOH produced sharper and more stable resonance dips up to the third layer, whereas AgNPs synthesized with 5% NaOH exhibited broader dips and increased noise due to larger particle sizes and a higher tendency toward agglomeration. The shift in SPR angle (ΔθSPR) increased with the number of deposited layers, with smaller shifts observed for AgNPs 2% and larger shifts for AgNPs 5%. These differences are attributed to variations in the ability of each layer to enhance surface electron oscillations and the degree of nanoparticle layer homogeneity. Therefore, this study demonstrates that modification of the gold film with green-synthesized AgNPs significantly affects the position and quality of the SPR curve. AgNPs synthesized with 2% NaOH provide a more stable resonance response, while AgNPs synthesized with 5% NaOH produce larger angular shifts but with reduced curve quality.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Green Synthesis, AgNPs, Surface Plasmon Resonance Green Synthesis, AgNPs, Surface Plasmon Resonance
Subjects:	Q Science Q Science > QC Physics
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Cheery Januar Rahma Putri Wachid
Date Deposited:	02 Feb 2026 04:33
Last Modified:	02 Feb 2026 04:33
URI:	http://repository.its.ac.id/id/eprint/131579

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