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Description
The identification of different chemical compounds and molecules is crucial, especially when they are toxic and humans are in direct contact with them, like Rhodamine B and Rhodamine 6G, that can be potentially toxic. Therefore, it is essential to employ sensitive techniques such as surface-enhanced Raman scattering (SERS), which can detect these compounds without damaging the sample and offers easy reproducibility, reliability, and high sensitivity. In this study, we utilized the SERS technique to detect Rhodamine B and Rhodamine 6G. We developed and implemented three SERS substrates: the first one comprised Ag nanoparticles deposited on Si wafers by spin coating, the second system involved Ag nanoparticles deposited on Si wafers using a Teflon ring, and the third one consisted of SiO$_2$ particles covered with Au and deposited on Si wafers by spin coating.
Raman spectroscopy showed SERS signals of Rhodamine B and Rhodamine 6G for all three systems. The results revealed that the substrate prepared with SiO$_2$ particles covered with Au produced the largest enhancement of the Raman signal. However, the SERS substrate deposited using a Teflon ring on Si wafers detected more signals of Rhodamine B and Rhodamine 6G, as the Teflon ring facilitated the formation of clusters of Ag nanoparticles, increasing the presence of hot spots. The SERS substrate deposited by spin coating on Si wafers provided well-defined signals due to the homogeneous distribution of the Ag nanoparticles, as demonstrated scanning electron microscopy (SEM). In contrast, the Au coating on SiO$_2$ particles was non-homogeneous.
Reference
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This work was supported by
This work was supported by: Y.L. Casallas-Moreno thanks to the project CONAHCYT-Frontier Science 2023 CF-2023-I-1117, and D. González thanks to the project SIP-20240184 from IPN.
| Keywords | SERS, detection, Rhodamine 6G, Rhodamine B. |
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| Author approval | I confirm |
| Author will attend | I confirm |
