IN SITU RAMAN ANALYSIS OF CARBON NANOWALLS DURING ELECTROCHEMICAL MEASUREMENT
This study focuses on the synthesis of carbon nanowalls (CNWs) and nitrogen-doped CNWs using the RI-PECVD method and their investigation through in situ Raman spectroscopy during voltammetric cycling and potentiostatic charging under both reduction and oxidation potentials. CNWs were synthesized on...
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| Format: | Article |
| Language: | English |
| Published: |
Al-Farabi Kazakh National University
2025-06-01
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| Series: | Physical Sciences and Technology |
| Online Access: | https://phst.kaznu.kz/index.php/journal/article/view/493 |
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| Summary: | This study focuses on the synthesis of carbon nanowalls (CNWs) and nitrogen-doped CNWs using the RI-PECVD method and their investigation through in situ Raman spectroscopy during voltammetric cycling and potentiostatic charging under both reduction and oxidation potentials. CNWs were synthesized on Ti/SiO₂/Si substrates. Electrochemical experiments were conducted in a three-electrode cell with CNWs as the working electrode, and analytes such as urea, citric acid, and hydrogen peroxide (H2O2) were used to study their effects during in situ Raman measurements. The Raman spectra of CNWs and N-doped CNWs were recorded in a voltage range of -1 V to 1 V (vs. Ag/AgCl), revealing no significant shifts in peak positions but showing an increase in the G to 2D peak ratio at higher voltages, indicating strong electron doping. The cyclic voltammetry results demonstrated that nitrogen doping enhances the reductive current of CNWs, with a clear reduction peak observed at -0.7 V across all analytes. The ID/IG peak ratio of N-doped CNWs increased upon analyte addition, suggesting the introduction of defects and restoration of sp2 domains. Furthermore, the position of the G and 2D peaks shifted significantly in response to different analytes. Sharper fluctuations were observed in N-doped CNWs. These results not only provide valuable insights into the electrochemical properties of CNWs but also highlight their potential for electrochemical sensing applications, offering a promising avenue for future research and development in this field.
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| ISSN: | 2409-6121 2522-1361 |