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17 results on '"Chis, Mihaela"'

8. Surface Enhanced Raman Spectroscopy for Quantitative Analysis: Results of a Large-Scale European Multi-Instrument Interlaboratory Study

Author

Fornasaro, Stefano, primary, Alsamad, Fatima, additional, Baia, Monica, additional, Batista de Carvalho, Luís A. E., additional, Beleites, Claudia, additional, Byrne, Hugh J., additional, Chiadò, Alessandro, additional, Chis, Mihaela, additional, Chisanga, Malama, additional, Daniel, Amuthachelvi, additional, Dybas, Jakub, additional, Eppe, Gauthier, additional, Falgayrac, Guillaume, additional, Faulds, Karen, additional, Gebavi, Hrvoje, additional, Giorgis, Fabrizio, additional, Goodacre, Royston, additional, Graham, Duncan, additional, La Manna, Pietro, additional, Laing, Stacey, additional, Litti, Lucio, additional, Lyng, Fiona M., additional, Malek, Kamilla, additional, Malherbe, Cedric, additional, Marques, Maria P. M., additional, Meneghetti, Moreno, additional, Mitri, Elisa, additional, Mohaček-Grošev, Vlasta, additional, Morasso, Carlo, additional, Muhamadali, Howbeer, additional, Musto, Pellegrino, additional, Novara, Chiara, additional, Pannico, Marianna, additional, Penel, Guillaume, additional, Piot, Olivier, additional, Rindzevicius, Tomas, additional, Rusu, Elena A., additional, Schmidt, Michael S., additional, Sergo, Valter, additional, Sockalingum, Ganesh D., additional, Untereiner, Valérie, additional, Vanna, Renzo, additional, Wiercigroch, Ewelina, additional, and Bonifacio, Alois, additional

Published
2020
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9. Surface Enhanced Raman Spectroscopy for Quantitative Analysis: Results of a Large-Scale European Multi-Instrument Interlaboratory Study

Author

Fornasaro, Stefano, Alsamad, Fatima, Baia, Monica, Batista de Carvalho, Luís A.E., Beleites, Claudia, Byrne, Hugh J., Chiadò, Alessandro, Chis, Mihaela, Chisanga, Malama, Daniel, Amuthachelvi, Dybas, Jakub, Eppe, Gauthier, Falgayrac, Guillaume, Faulds, Karen, Gebavi, Hrvoje, Giorgis, Fabrizio, Goodacre, Royston, Graham, Duncan, La Manna, Pietro, Laing, Stacey, Litti, Lucio, Lyng, Fiona M., Malek, Kamilla, Malherbe, Cedric, Marques, Maria P .., Meneghetti, Moreno, Mitri, Elisa, Mohaček-Grošev, Vlasta, Morasso, Carlo, Muhamadali, Howbeer, Musto, Pellegrino, Novara, Chiara, Pannico, Marianna, Penel, Guillaume, Piot, Olivier, Rindzevicius, Tomas, Rusu, Elena A., Schmidt, Michael S., Sergo, Valter, Sockalingum, Ganesh D., Untereiner, Valérie, Vanna, Renzo, Wiercigroch, Ewelina, Bonifacio, Alois, Fornasaro, Stefano, Alsamad, Fatima, Baia, Monica, Batista de Carvalho, Luís A.E., Beleites, Claudia, Byrne, Hugh J., Chiadò, Alessandro, Chis, Mihaela, Chisanga, Malama, Daniel, Amuthachelvi, Dybas, Jakub, Eppe, Gauthier, Falgayrac, Guillaume, Faulds, Karen, Gebavi, Hrvoje, Giorgis, Fabrizio, Goodacre, Royston, Graham, Duncan, La Manna, Pietro, Laing, Stacey, Litti, Lucio, Lyng, Fiona M., Malek, Kamilla, Malherbe, Cedric, Marques, Maria P .., Meneghetti, Moreno, Mitri, Elisa, Mohaček-Grošev, Vlasta, Morasso, Carlo, Muhamadali, Howbeer, Musto, Pellegrino, Novara, Chiara, Pannico, Marianna, Penel, Guillaume, Piot, Olivier, Rindzevicius, Tomas, Rusu, Elena A., Schmidt, Michael S., Sergo, Valter, Sockalingum, Ganesh D., Untereiner, Valérie, Vanna, Renzo, Wiercigroch, Ewelina, and Bonifacio, Alois

Abstract

Surface-enhanced Raman scattering (SERS) is a powerful and sensitive technique for the detection of fingerprint signals of molecules and for the investigation of a series of surface chemical reactions. Many studies introduced quantitative applications of SERS in various fields, and several SERS methods have been implemented for each specific application, ranging in performance characteristics, analytes used, instruments, and analytical matrices. In general, very few methods have been validated according to international guidelines. As a consequence, the application of SERS in highly regulated environments is still considered risky, and the perception of a poorly reproducible and insufficiently robust analytical technique has persistently retarded its routine implementation. Collaborative trials are a type of interlaboratory study (ILS) frequently performed to ascertain the quality of a single analytical method. The idea of an ILS of quantification with SERS arose within the framework of Working Group 1 (WG1) of the EU COST Action BM1401 Raman4Clinics in an effort to overcome the problematic perception of quantitative SERS methods. Here, we report the first interlaboratory SERS study ever conducted, involving 15 laboratories and 44 researchers. In this study, we tried to define a methodology to assess the reproducibility and trueness of a quantitative SERS method and to compare different methods. In our opinion, this is a first important step toward a "standardization" process of SERS protocols, not proposed by a single laboratory but by a larger community.

Published
2020

10. Nonlinear optical study of Schiff bases using Z-scan technique

Author

Derkowska-Zielinska, Beata, Barwiolek, Magdalena, Boudebs, Georges, Wang, Hongzhen, Cassagne, Christophe, Chis, Mihaela, Amaral, Anderson, de Araújo, Cid, Nicolaus Copernicus University [Toruń], Laboratoire de Photonique d'Angers (LPHIA), Université d'Angers (UA), Departamento de Fisica, Universidade Federal de Pernambuco, and Universidade Federal de Pernambuco [Recife] (UFPE)

Subjects
Materials science, Analytical chemistry, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, chemistry.chemical_compound, law, Homogeneity (physics), [CHIM]Chemical Sciences, Z-scan technique, Electrical and Electronic Engineering, Thin film, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Chloroform, Schiff base, [PHYS.PHYS]Physics [physics]/Physics [physics], business.industry, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, chemistry, Ethylamine, Photonics, 0210 nano-technology, business
Abstract

Three Schiff bases dissolved in chloroform were investigated to determine their nonlinear optical properties using D4σ Z-scan technique employing 10 ps pulses of Nd:YAG laser at 355 nm. It was found that the highest value of the nonlinear refractive index was obtained for Schiff base with 2-(2-pyridyl)ethylamine. Whereas, a negative nonlinear refractive index was extracted for symmetrical Schiff base with cyclohexanediamine with NO2 group. In addition, the Schiff base thin films were investigated using AFM and SEM/EDX measurements to check their quality and homogeneity, which is necessary in the production of photonic devices.

Published
2020
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17. Thermal lens Z-scan measurements: theoretical and experimental uncertainties for low and high fluorescence quantum yields.

Author

Boudebs G, Zinoune JB, Cassagne C, and Chis M

Abstract

The single-beam Z -scan thermal lens technique is conducted to evaluate the fluorescence quantum yield of various solutions in the case of high-moderate absorption, considering both scenarios: solutions with substantial fluorescence and solutions with high thermal efficiency but low fluorescence. An analytical calculation is performed to determine the uncertainties associated with the random errors introduced by optical detectors. The results reveal that solutions with low fluorescence lead to a significant error, whereas higher fluorescence can help in decreasing the uncertainty. Additionally, the issue of random errors arising when multiple measurements are needed to accurately estimate the fluorescence of a solution will be discussed in different situations.

Published
2023
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