Khilfiyah, Hani Fitriyatul (2026) Nano-islands Emas (Au-NIs) pada Substrat Sapphire (Al₂O₃): Penumbuhan, Karakterisasi, dan Aplikasi pada Resonansi Plasmon Terlokalisasi. Masters thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 6001232002-Master_Thesis.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
6001232002-Master_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (5MB) | Request a copy |
Abstract
Nano-islands emas (Au-NIs) merupakan struktur plasmonik yang mampu menghasilkan penguatan medan elektromagnetik lokal melalui fenomena localized surface plasmon resonance (LSPR), yang berpotensi tinggi untuk aplikasi sensor optik berbasis surface-enhanced Raman scattering (SERS). Penelitian ini bertujuan untuk menumbuhkan dan mengkarakterisasi Au-NIs pada substrat sapphire (Al₂O₃) menggunakan metode pulsed laser deposition (PLD) dengan variasi suhu deposisi. Karakterisasi morfologi dan kristalinitas dilakukan menggunakan Atomic Force Microscopy (AFM) dan X-Ray Diffraction (XRD), sedangkan kinerja plasmonik diuji melalui pengukuran SERS dengan analit methylene blue (MB). Simulasi numerik finite-difference time-domain (FDTD) juga dilakukan untuk menggambarkan distribusi medan listrik lokal. Hasil penelitian menunjukkan bahwa suhu deposisi 450 °C merupakan kondisi optimum, yang menghasilkan Au-NIs dengan ukuran partikel terkecil (11.27 ± 4.36 nm) dan kerapatan tertinggi sehingga menciptakan celah sempit (nanogap) yang padat. Analisis XRD menunjukkan transisi dari struktur single-domain pada suhu rendah menjadi multi-domain pada suhu tinggi. Kinerja SERS tertinggi diperoleh pada sampel suhu 450 °C dengan nilai Enhancement Factor (EF) eksperimental mencapai 17,16, yang dikonfirmasi oleh simulasi FDTD melalui visualisasi pembentukan hotspot plasmonik dominan pada daerah nanogap. Penelitian ini menyimpulkan bahwa pengendalian suhu deposisi pada proses PLD adalah faktor kunci dalam mengoptimasi substrat SERS berbasis sapphire untuk aplikasi sensor optik beresolusi tinggi.
===================================================================================================================================
Gold nano-islands (Au-NIs) are plasmonic structures capable of generating local electromagnetic field enhancement through the localized surface plasmon resonance (LSPR) phenomenon, which has high potential for surface-enhanced Raman scattering (SERS) based optical sensor applications. This study aims to grow and characterize Au-NIs on sapphire (Al₂O₃) substrates using the pulsed laser deposition (PLD) method with variations in deposition temperature. Morphological and crystallinity characterizations were performed using Atomic Force Microscopy (AFM) and X-Ray Diffraction (XRD), while the plasmonic performance was evaluated through SERS measurements using methylene blue (MB) as an analyte. Finite-difference time-domain (FDTD) numerical simulations were also conducted to visualize the local electric field distribution. The results show that a deposition temperature of 450 °C is the optimum condition, producing Au-NIs with the smallest particle size (11.27 ± 4.36 nm) and the highest density, thereby creating dense, narrow nanogaps. XRD analysis revealed a transition from a single-domain structure at lower temperatures to a multi-domain structure at higher temperatures. The highest SERS performance was observed in the 450 °C sample, achieving an experimental Enhancement Factor (EF) of 17.16, as confirmed by FDTD simulations, which visualized dominant plasmonic hotspot formation in the nanogap regions. This study concludes that controlling the deposition temperature in the PLD process is a key factor in optimizing sapphire-based Au-NIs substrates for high-resolution optical sensor and plasmonic applications.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Nano-islands emas, Sapphire, Pulsed Laser Deposition (PLD), Localized Surface Plasmon Resonance (LSPR), Surface-Enhanced Raman Scattering (SERS), FDTD. Gold nano-islands, Sapphire, Pulsed Laser Deposition (PLD), Localized Surface Plasmon Resonance (LSPR), Surface-Enhanced Raman Scattering (SERS), FDTD. |
| Subjects: | Q Science > QC Physics Q Science > QC Physics > QC451 Spectroscopy Q Science > QC Physics > QC 611.97.T46 Temperature effects. Including transition temperature Q Science > QC Physics > QC665.E38 Electric fields. |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45101-(S2) Master Thesis |
| Depositing User: | Hani Fitriyatul Khilfiyah |
| Date Deposited: | 04 Feb 2026 01:10 |
| Last Modified: | 04 Feb 2026 01:10 |
| URI: | http://repository.its.ac.id/id/eprint/131951 |
Available Versions of this Item
- Nano-islands Emas (Au-NIs) pada Substrat Sapphire (Al₂O₃): Penumbuhan, Karakterisasi, dan Aplikasi pada Resonansi Plasmon Terlokalisasi. (deposited 04 Feb 2026 01:10) [Currently Displayed]
Actions (login required)
 |
View Item |