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Development of Gold Nanostars Doped Flexible Substrate for Polystyrene Microplastic Detection Using Surface-enhanced Raman Scattering (sers)
Summary
Detecting microplastics in the environment requires fast, sensitive analytical tools, and this study developed a low-cost sensor using gold nanostars on a flexible substrate to detect polystyrene microplastics via surface-enhanced Raman scattering (SERS). The gold nanostar structures amplify the Raman signal of plastic particles, enabling detection at very low concentrations. This kind of portable, affordable detection technology could help expand microplastic monitoring beyond well-equipped research labs.
Microplastics are plastic fragments smaller than 5 millimeters, originating from primary sources such as manufactured beads and fibers and secondary degradation of larger plastic materials. As a significant environmental pollutant, microplastics require sensitive and efficient detection techniques. This study presents a simple and cost-effective surface-enhanced Raman scattering method using a flexible substrate composed of gold nanostars deposited on filter paper. Polystyrene particles with an average size of approximately 0.5 µm were used as a model microplastic pollutant to evaluate the performance flexible substrate. The surface-enhanced Raman scattering signal enhancement was analyzed using a benchtop Raman system with a 532 nm excitation wavelength, achieving a detection limit as low as 5 µg/mL and an enhancement factor of approximately 1300. The feasibility of detecting other microplastics, including polyethylene, polypropylene and polyethylene terephthalate, was assessed. The results demonstrate that the gold nanostar-based flexible surface-enhanced Raman scattering substrate offers a highly sensitive, portable, and cost-effective alternative for real-world microplastic monitoring in aquatic environments, outperforming conventional spectroscopic techniques.
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