| Full text | |
| Author(s): |
Neto, Nilton F. Azevedo
;
Marques, Samuel A.
;
Miranda, Felipe S.
;
Junior, Pedro W. P. Moreira
;
Pereira, Andre L. J.
;
Constantino, Carlos J. L.
;
da Silva, Jose H. Dias
;
Pessoa, Rodrigo S.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | VIBRATIONAL SPECTROSCOPY; v. 136, p. 8-pg., 2024-12-19. |
| Abstract | |
Plasma-activated water (PAW), generated by non-thermal plasma, has shown great potential in various applications, including bacterial inactivation, agriculture, and disinfection, primarily attributed to the presence of reactive oxygen and nitrogen species (RONS). Traditional characterization methods for RONS in PAW often encounter limitations in sensitivity and specificity, particularly at low concentrations. In this study, we investigated the application of surface-enhanced Raman spectroscopy (SERS) for the characterization of PAW. A SERS substrate was prepared by sputter-depositing a silver (Ag) film onto a cover glass. The structural, topographic, and optical properties of the film were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), and reflectance spectroscopy. Utilizing the Ag film substrates, we observed a substantial enhancement in the Raman signals of deionized water compared to measurements on glass substrates, achieving an analytical enhancement factor (AEF) of approximately 30 for the O-H stretching band. The characterization of PAW using the SERS substrate enabled the acquisition of well-defined Raman spectra and facilitated the detection of nitrate ions (NO3-) in PAW generated by a dielectric barrier discharge reactor. The results obtained from the PAW Raman spectra were further supported by changes in physicochemical properties, such as decreased pH and increased conductivity, as well as UV-Vis spectroscopy results. These findings demonstrate that sputter-deposited Ag films can serve as a valuable methodological tool for the characterization of PAW using Raman spectroscopy. (AU) | |
| FAPESP's process: | 22/11544-0 - Technological EMU: acquisition of a near-field scanning optical microscopy system coupled with atomic force microscopy and tip-enhanced Raman spectroscopy for chemical and physical imaging at micro and nanoscale |
| Grantee: | Rodrigo Savio Pessoa |
| Support Opportunities: | Research Infrastructure Program - Technology and Innovation |
| FAPESP's process: | 23/02268-2 - Generation and characterization of different liquids activated with plasma for use in endodontic treatment |
| Grantee: | Nilton Francelosi Azevedo Neto |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 21/14181-3 - Development and study of a plasma system generated by dielectric barrier discharge (DBD) for continuous activation of liquids applied in dental treatments |
| Grantee: | Felipe de Souza Miranda |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/05856-7 - Use of low temperature atmospheric pressure plasma in dentistry: from laboratory bench to clinics |
| Grantee: | Cristiane Yumi Koga Ito |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis |
| Grantee: | Osvaldo Novais de Oliveira Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 23/02273-6 - Study of the effect of the operating parameters of a plasma reactor on the physicochemical properties of the volatile and non-volatile fractions generated in the thermal conversion process of sludge from ETEs |
| Grantee: | Pedro William Paiva Moreira Júnior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |