resumo
Developing cost-effective and sensitive Surface-Enhanced Raman Spectroscopy (SERS) paper platforms represents a significant step forward for detecting specific water contaminants at ultra-low concentrations in remote regions of the globe. However, the hydrophilic, irregular, and porous nature of common paper often results in poor reproducibility and lack of uniformity of paper sensors. In this study, we developed efficient SERS substrates by combining office paper, polylactic acid nanoparticles (PLA NPs), and silver nanoparticles (AgNPs) using a two-step drop-casting method. In these substrates, the PLA NPs create a nano-rough film that reduces porosity and hydrophilicity of paper, while the AgNPs provide SERS activity. The film's packaging ability was optimized by adjusting the drying temperature of the PLA colloid, which significantly influenced the paper's wettability. Additionally, the drying temperature was found to substantially affect the loading of AgNPs on the substrate surface. Initial tests with rhodamine 6G as a model analyte showed that the optimal SERS response was achieved at a drying temperature of 100 degrees C, with a sixfold concentration of the Ag colloid. The effectiveness of these paper- based sensors was further demonstrated by detecting pesticides and antibiotics in mineral water, specifically paraquat and ciprofloxacin, with detection limits of 1 mu M and 200 mu M, respectively.
palavras-chave
SERS; FABRICATION; SILVER; NANOPARTICLES; PESTICIDES
categoria
Chemistry; Materials Science; Physics
autores
Martins, NCT; Silva, CSSP; Pinto, RJB; Trindade, T
nossos autores
Natércia da Conceição Tomé Martins
Investigador Júnior
Ricardo Pinto
Investigador
Tito Trindade
Professor CatedráticoProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020) , UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) , financed by national funds through the FCT/MCTES (PIDDAC) . Natercia C.T. Martins and Ricardo J.B. Pinto are funded by National funds (OE) , through FCT- Fundacao para a Ciencia e Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by the law 57/2017, of July 19.