Substrate signal inhibition in Raman analysis of microplastic particles
In Raman analysis, the substrate material serves very often for signal enhancement, especially when metallic surfaces are involved; however, in other cases, the substrate has an opposite effect as it is the source of a parasitic signal preventing the observation of the sample material of interest. T...
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sg-ntu-dr.10356-1699482023-08-18T15:39:55Z Substrate signal inhibition in Raman analysis of microplastic particles Elsayed, Ahmed A. Othman, Ahmed M. Sabry, Yasser M. Marty, Frédéric Omran, Haitham Khalil, Diaa Liu, Ai Qun Bourouina, Tarik School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Raman Analysis Microplastic Particles In Raman analysis, the substrate material serves very often for signal enhancement, especially when metallic surfaces are involved; however, in other cases, the substrate has an opposite effect as it is the source of a parasitic signal preventing the observation of the sample material of interest. This is particularly true with the advent of microfluidic devices involving either silicon or polymer surfaces. On the other hand, in a vast majority of Raman experiments, the analysis is made on a horizontal support holding the sample of interest. In our paper, we report that a simple tilting of the supporting substrate, in this case, silicon, can drastically decrease and eventually inhibit the Raman signal of the substrate material, leading to an easier observation of the target analyte of the sample, in this case, microplastic particles. This effect is very pronounced especially when looking for tiny particles. Explanation of this trend is provided thanks to a supporting experiment and further numerical simulations that suggest that the lensing effect of the particles plays an important role. These findings may be useful for Raman analysis of other microscale particles having curved shapes, including biological cells. Published version This project received support from the I-SITEFUTURE Initiative (Reference ANR-16-IDEX-0003) in the frame of the project NANO-4-WATER as well as the METAWATER Project (ANR-20-CE08-0023 META-WATER). 2023-08-15T08:35:39Z 2023-08-15T08:35:39Z 2023 Journal Article Elsayed, A. A., Othman, A. M., Sabry, Y. M., Marty, F., Omran, H., Khalil, D., Liu, A. Q. & Bourouina, T. (2023). Substrate signal inhibition in Raman analysis of microplastic particles. ACS Omega, 8(11), 9854-9860. https://dx.doi.org/10.1021/acsomega.2c06536 2470-1343 https://hdl.handle.net/10356/169948 10.1021/acsomega.2c06536 36969403 2-s2.0-85149894139 11 8 9854 9860 en ACS Omega © 2023 The Authors. Published by American Chemical Society. This is an open-access article distributed under the terms of the Creative Commons Attribution License. application/pdf |
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Engineering::Electrical and electronic engineering Raman Analysis Microplastic Particles Elsayed, Ahmed A. Othman, Ahmed M. Sabry, Yasser M. Marty, Frédéric Omran, Haitham Khalil, Diaa Liu, Ai Qun Bourouina, Tarik Substrate signal inhibition in Raman analysis of microplastic particles |
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In Raman analysis, the substrate material serves very often for signal enhancement, especially when metallic surfaces are involved; however, in other cases, the substrate has an opposite effect as it is the source of a parasitic signal preventing the observation of the sample material of interest. This is particularly true with the advent of microfluidic devices involving either silicon or polymer surfaces. On the other hand, in a vast majority of Raman experiments, the analysis is made on a horizontal support holding the sample of interest. In our paper, we report that a simple tilting of the supporting substrate, in this case, silicon, can drastically decrease and eventually inhibit the Raman signal of the substrate material, leading to an easier observation of the target analyte of the sample, in this case, microplastic particles. This effect is very pronounced especially when looking for tiny particles. Explanation of this trend is provided thanks to a supporting experiment and further numerical simulations that suggest that the lensing effect of the particles plays an important role. These findings may be useful for Raman analysis of other microscale particles having curved shapes, including biological cells. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Elsayed, Ahmed A. Othman, Ahmed M. Sabry, Yasser M. Marty, Frédéric Omran, Haitham Khalil, Diaa Liu, Ai Qun Bourouina, Tarik |
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Article |
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Elsayed, Ahmed A. Othman, Ahmed M. Sabry, Yasser M. Marty, Frédéric Omran, Haitham Khalil, Diaa Liu, Ai Qun Bourouina, Tarik |
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Elsayed, Ahmed A. |
title |
Substrate signal inhibition in Raman analysis of microplastic particles |
title_short |
Substrate signal inhibition in Raman analysis of microplastic particles |
title_full |
Substrate signal inhibition in Raman analysis of microplastic particles |
title_fullStr |
Substrate signal inhibition in Raman analysis of microplastic particles |
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Substrate signal inhibition in Raman analysis of microplastic particles |
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substrate signal inhibition in raman analysis of microplastic particles |
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2023 |
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https://hdl.handle.net/10356/169948 |
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1779156496096952320 |