Pengukuran Surface Plasmon Resonance berbasis Konfigurasi Kretschmann untuk Sensor Gas Amonia dan Aseton

Yuliana, Yuliana (2025) Pengukuran Surface Plasmon Resonance berbasis Konfigurasi Kretschmann untuk Sensor Gas Amonia dan Aseton. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Amonia dan aseton merupakan jenis gas berbahaya yang banyak ditemukan dalam kehidupan sehari-hari, terutama di lingkungan industri dan laboratorium. Paparan dalam konsentrasi tinggi, yaitu diatas 25 ppm untuk amonia dan 200 ppm untuk aseton, dapat menimbulkan gangguan kesehatan serius, sehingga diperlukan metode sensing yang cepat, akurat, dan sensitif. Penelitian ini bertujuan menganalisis mekanisme sensing gas amonia dan aseton menggunakan sensor berbasis Surface Plasmon Resonance (SPR) serta mengamati respons sensor terhadap variasi jenis gas dan waktu penguapan yang mempengaruhi konsentrasi gas berdasarkan perubahan sudut resonansi dan indeks bias. Dalam penelitian ini, sistem sensor SPR dirancang menggunakan laser HeNe sebagai sumber cahaya, dua sensor fotodetektor sebagai detektor sinyal referensi dan sinyal hasil interaksi sampel, prisma setengah silinder yang dilapisi emas, dan chamber khusus untuk mengalirkan gas uji. Adapun gas uji yang digunakan adalah amonia dan aseton, dengan variasi waktu penguapan antara 5 hingga 30 menit. Sensor SPR memanfaatkan interaksi cahaya terpolarisasi dengan lapisan tipis emas yang menghasilkan gelombang plasmon permukaan. Gas dengan konsentrasi yang berbeda berikatan dengan permukaan sensor mengakibatkan adanya perubahan indeks bias akan menggeser sudut resonansi, yang dapat dideteksi secara optik sebagai indikator keberadaan dan konsentrasi gas. Hasil pengukuran menunjukkan pergeseran sudut SPR semakin membesar secara signifikan seiring bertambahnya konsentrasi, yang menunjukkan peningkatan indeks bias akibat adanya adsorpsi molekul gas pada permukaan sensor. Sensor menunjukkan sensitivitas yang baik serta figure of merit yang kompetitif yang menunjukkan kestabilan dan kemampuan deteksi yang memadai, mengindikasikan bahwa sensor SPR berbasis emas memiliki potensi tinggi untuk aplikasi deteksi gas amonia dan aseton secara real-time.
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Ammonia and acetone are hazardous gases commonly found in everyday life, particularly in industrial and laboratory environments. Exposure to high concentrations, above 25 ppm for ammonia and 200 ppm for acetone, can cause serious health problems, thus requiring a detection method that is fast, accurate, and sensitive. This study aims to analyze ammonia and acetone gases sensing using a Surface Plasmon Resonance (SPR)-based sensor and to observe the sensor's response to different gas types and evaporation times that affect gas concentration, as indicated by changes in resonance angle and refractive index. In this researchhe SPR sensor system was designed using a HeNe laser as a light source, two photodiode sensors as detectors of reference signals and sample interaction signals, a gold-coated half-cylinder prism, and a specialized chamber to deliver the test gases. The test gases used were ammonia and acetone, with evaporation time variations ranging from 5 to 30 minutes. The SPR sensor operates based on the interaction of p-polarized light with a thin gold film that generates surface plasmon waves. Gases with different concentrations interacting with the sensor surface cause a change in the refractive index, which leads to a shift in the resonance angle that can be optically detected as an indicator of the gas presence and concentration. The measurement results show that the SPR angle shift increases significantly with higher gas concentrations, indicating a rise in refractive index due to the adsorption of gas molecules on the sensor surface. The sensor demonstrated good sensitivity and a competitive figure of merit (FOM), indicating stability and adequate detection performance, suggesting that the gold-based SPR sensor holds high potential for real-time detection applications of hazardous gases such as ammonia and acetone.

Item Type: Thesis (Other)
Uncontrolled Keywords: Indeks Bias, Konfigurasi Kretschmann, Sensor gas, Surface Plasmon Resonance, Kretschmann Configuration, Gas Sensor, Surface Plasmon Resonance, Refractive Index.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1573 Detectors. Sensors
Divisions: Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User: Yuliana Yuliana
Date Deposited: 21 Jul 2025 05:57
Last Modified: 21 Jul 2025 05:57
URI: http://repository.its.ac.id/id/eprint/120269

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