SINTESIS NANOPLATE Au MENGGUNAKAN METODE PHOTOCHEMICAL REDUCTION DENGAN SINAR UV C UNTUK PENDETEKSI DYE (METHYLENE BLUE)

LAELATUL DALILAH, . (2025) SINTESIS NANOPLATE Au MENGGUNAKAN METODE PHOTOCHEMICAL REDUCTION DENGAN SINAR UV C UNTUK PENDETEKSI DYE (METHYLENE BLUE). Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

This study focuses on the development of a Surface-Enhanced Raman Scattering (SERS) substrate based on gold nanoparticles (AuNPs) to enhance the sensitivity of methylene blue (MB) detection. The AuNPs were synthesized via the reduction of HAuCl₄ using HEPES as both the reducing and stabilizing agent under ultraviolet (UV) irradiation. Variations in HEPES concentration showed that 0.1 M produced nanoparticles with the best optical characteristics based on UV-Vis spectroscopy results. TEM characterization confirmed the formation of gold nanoplate structures, while X-Ray Diffraction (XRD) analysis indicated a dominant peak at the (111) plane, supporting the presence of anisotropic morphology. The SERS substrate was prepared by the drop casting method onto a silicon wafer surface and tested with MB solutions at six different concentrations (10 ppm; 5 ppm; 0.1 ppm; 0.01 ppm; 0.001 ppm; 0.0001 ppm). Raman measurements revealed that the substrate could detect methylene blue down to a concentration of 0.0001 ppm, with a significant increase in spectral intensity compared to Raman measurements without the substrate. A specific achievement of this study is the successful fabrication of a highly sensitive AuNP-based SERS substrate capable of enhancing the detection of dye molecules at ultra-low concentrations.

Item Type:	Thesis (Sarjana)
Additional Information:	1). Prof. Dr. Iwan Sugihartono, M.Si. 2). Dr. Affi Nur Hidayah, M.Si.
Subjects:	Sains > Fisika
Divisions:	FMIPA > S1 Fisika
Depositing User:	LAELATUL DALILAH .
Date Deposited:	26 Aug 2025 06:21
Last Modified:	26 Aug 2025 06:21
URI:	http://repository.unj.ac.id/id/eprint/62066

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