Abstract
Surfactant-free silver nanoparticle-loaded reduced graphene oxide (Ag/rGO) nanohybrids have the potential for fabricating efficient SERS-based sensors. Using surfactants in the synthesis of Ag/rGO nanohybrid often passivates the SERS activity and produces interference in the intrinsic Raman signal of the analytes. And also, the chemical-reducing agents used to synthesize Ag/rGO nanohybrid are toxic and not eco-friendly. Therefore, in this work, we have synthesized a stable Ag/rGO nanohybrid without the aid of a surfactant and toxic reducing agent. The Ag/rGO nanohybrid SERS substrate is tested for the detection of melamine in the range of 1 × 10−3 to 1 × 10−8 M in H2O. The characteristic Raman peak intensity was found to vary linearly with respect to melamine concertation with a correlation coefficient of 0.94 and the enhancement factor is 8.4 × 106. SERS analysis on milk extract could detect 1 × 10−6 M melamine adulteration, one order better than the allowable limit of 2.0 × 10−5 M.
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All data generated in this study appear in the submitted article.
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Acknowledgements
The author P.A. Manojkumar is thankful to Dr. R. Divakar, Dir. MSG, Dr. S.K. Dhara, Head-SSSD, and Dr. S. Tripurasundari, Head-SDS for their encouragement and support.
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The author Gokulakrisnan J contributed to the methodology, conceptualized and formulated the studies, carried out the experiments, collected data, and analyzed and wrote the original draft. The author P.A. Manojkumar provided resources and technical discussions and reviewed the manuscript. The author Kamakshi Koppole supervised the studies and reviewed the manuscript. All authors have given approval to the final version of the manuscript.
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J, G., Manojkumar, P.A. & Koppole, K. Surfactant-Free Facile Synthesis of Ag/rGO Nanohybrid for SERS-Based Detection of Melamine. Plasmonics 19, 471–480 (2024). https://doi.org/10.1007/s11468-023-01999-3
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DOI: https://doi.org/10.1007/s11468-023-01999-3