Abstract
The layer-by-layer (LbL) method demonstrates significant versatility for constructing substrates with nanoscale-thick layers and diverse compositions. This technique is based on alternate deposition of species that interact electrostatically. Studies have demonstrated that this technique holds promise for use as a surface-enhanced Raman scattering (SERS) substrate, enabling the detection of pesticides at low concentrations and finding applications in the biological field. In this study, a simple methodology based on the layer-by-layer (LbL) method was developed to construct SERS substrates. Substrates with varying numbers of bilayers (1, 5, or 10) were built on glass slides. The positive layer was composed of the natural polysaccharide chitosan. In contrast, the negative layer consists of gold nanoparticles (AuNPs) with a negative charge on their surface, achieved using sodium citrate as a reducing agent. The SERS substrates were characterized by UV–VIS-NIR spectroscopy and atomic force microscopy (AFM). They were tested as SERS substrates by utilizing thiophenol (TP) at a concentration of 1.0 × 10–3 mol L−1. The distribution of the SERS signal was monitored through the 417 cm−1 peak, which is attributed to the CH stretching mode characteristic of TP. The substrates exhibited a more significant enhancement with an increase in the number of bilayers. They have proven highly promising for future applications, such as diagnostic evaluation of diseases, detection of pesticide molecules, biological molecules, and various other applications.
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Data availability
Data will be available upon request to the corresponding authors. Available data include Raman spectra, Raman spectra used to creat the SERS mappings and original microscopy files.
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Acknowledgements
The authors thank FAPEMIG, CNPq, and CAPES (financing code 001) for financial support. LPFP thanks CAPES for a fellowship, and PHMT thanks FAPEMIG for a fellowship. The authors thank ‘INMETRO – Divisão de Metrologia de Materiais’ for accessing the AFM facility and the Brazilian Company of Agricultural Research (EMBRAPA) Dairy Cattle for ζ-potential measurements.
Funding
This study was funded by the Brazilian funding agencies: “Fundação de Amparo à Pesquisa do Estado de Minas Gerais,” FAPEMIG, grant APQ-00887–23; “Conselho Nacional de Desenvolvimento Científico e Tecnológico,” CNPq, grants 406853/2021–5 and 311958/2021–4; and “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior,” CAPES, financing code 001.
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PHMT and LPFP performed the experiments on the deposition of materials and spectroscopy. PHMT wrote the initial draft. LPFP worked on the first steps of revision of the manuscript. BF performed the probe microscopy experiments and discussed the data. GFSA discussed data, acquired funding, and supervised the experiments. All the authors reviewed and discussed the manuscript in several iterations.
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de Melo Toledo, P.H., de Faria Peixoto, L.P., Fragneaud, B. et al. Layer-by-layer chitosan and gold nanoparticles as surface-enhanced Raman scattering substrate. J Nanopart Res 26, 74 (2024). https://doi.org/10.1007/s11051-024-05982-9
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DOI: https://doi.org/10.1007/s11051-024-05982-9