Ayu Ramadhani, Freygieon Ogiek Rizal Sukma, Miranda Nurul Anisa, Syahidatun Na’imah, Mahardika Auditia Hanif, Dionysius J D H Santjojo, Retna Apsari, Sulaiman Wadi Harun, Masruroh
The functionalization of a gold surface with 3-aminopropyl-triethoxysilane (APTES) enhances the performance of fiber optic-based plasmonic sensors. Using the aqueous phase deposition (APD) method, APTES concentrations of 1–4% were tested. FTIR analysis showed increased amine (-NH₂) absorption with ammonium ions interacting electrostatically with Au, which improved particle rearrangement, reduced porosity, and increased surface compactness at higher concentrations. These changes enhanced the refractive index, shifted the SPR wavelength to the right, and deepened the transmittance curves. The addition of APTES significantly improved sensor performance, with sensor sensitivity increasing to 2088 nm/RIU with 4% APTES compared to 1484 nm/RIU without APTES. © 2025 The Author(s). Published with license by Taylor & Francis Group, LLC.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Malang, Indonesia; Department of Physics, Faculty of Science and Technology, Universitas Airlangga, Surabaya, Indonesia; Department of Electrical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur, Malaysia
