Optimizing Surface-Enhanced Raman Spectroscopy Substrates with Gold Nanospheres, Nanorods and Nanostars
DOI:
https://doi.org/10.36790/epistemus.v18i35.315Keywords:
gold nanoparticles, localized surface plasmon, SERS, enhancement factorAbstract
Surface-Enhanced Raman Spectroscopy is a powerful technique that boosts the distinctive fingerprint signals of molecules, making them more accessible for analysis. It utilizes metallic nanoparticles, acting as amplifiers, to greatly enhance the signals emitted by the molecules. This study aimed to explore the SERS potential of gold nanoparticles (AuNPs) with different geometries using a non-resonant molecule, 4-MBA. Nanospheres (14±2 nm), nanorods (11±2 nm x 50±7 nm) and nanostars (38±4 nm) were synthesized via the HAuCl4 reduction method. All three AuNP geometries exhibited a remarkable enhancement of the Raman signal of 4-MBA by a magnitude of 104. Notably, only gold nanorods and nanostars displayed localized surface plasmon within the biological window, making them highly suitable for biological sample analysis. Meanwhile, the application of gold nanospheres should be limited to chemical SERS detection. These findings confirm the potential use of these nanostructures as SERS substrates for studying molecules with low molar...
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