Towards Application of Nanodiamonds for in-situ Monitoring of Radicals in Liquid Phase Chemical Reactions
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arXiv
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2026
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| author | Herbst, Emma Westrich, Sebastian Erlenbach, Alena Gutsche, Jonas Wächtler, Maria Neu, Elke |
| author_facet | Herbst, Emma Westrich, Sebastian Erlenbach, Alena Gutsche, Jonas Wächtler, Maria Neu, Elke |
| contents | In many chemical reactions, short-lived radical intermediates play a crucial role, while detecting such short-lived species in-situ remains challenging. The optically readable electronic spin of nitrogen-vacancy (NV) centers in diamond is a nanoscale sensor for such radical species: its longitudinal spin relaxation time (T$_{1}$) reacts to magnetic fluctuations from the unpaired electrons of radical species in its local environment. In this setting, we demonstrate the successful in-situ detection of the nitroxide radical 2,2,6,6-Tetramethylpiperidinyloxyl (TEMPO) using NV center-based T$_1$ relaxometry after depositing nanodiamonds onto the inner wall of a glass cuvette. A significant concentration-dependent shortening of the relaxation time was observed, from $197\:μs \pm 21\:μs$ without radical to $66\:μs \pm 30\:μs$ at a concentration of 1 M TEMPO. The detection is sensitive in the nanomolar (nM) range and the determined signal-to-noise ratio is between 1.6 and 3. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_19433 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Towards Application of Nanodiamonds for in-situ Monitoring of Radicals in Liquid Phase Chemical Reactions Herbst, Emma Westrich, Sebastian Erlenbach, Alena Gutsche, Jonas Wächtler, Maria Neu, Elke Mesoscale and Nanoscale Physics Chemical Physics Quantum Physics In many chemical reactions, short-lived radical intermediates play a crucial role, while detecting such short-lived species in-situ remains challenging. The optically readable electronic spin of nitrogen-vacancy (NV) centers in diamond is a nanoscale sensor for such radical species: its longitudinal spin relaxation time (T$_{1}$) reacts to magnetic fluctuations from the unpaired electrons of radical species in its local environment. In this setting, we demonstrate the successful in-situ detection of the nitroxide radical 2,2,6,6-Tetramethylpiperidinyloxyl (TEMPO) using NV center-based T$_1$ relaxometry after depositing nanodiamonds onto the inner wall of a glass cuvette. A significant concentration-dependent shortening of the relaxation time was observed, from $197\:μs \pm 21\:μs$ without radical to $66\:μs \pm 30\:μs$ at a concentration of 1 M TEMPO. The detection is sensitive in the nanomolar (nM) range and the determined signal-to-noise ratio is between 1.6 and 3. |
| title | Towards Application of Nanodiamonds for in-situ Monitoring of Radicals in Liquid Phase Chemical Reactions |
| topic | Mesoscale and Nanoscale Physics Chemical Physics Quantum Physics |
| url | https://arxiv.org/abs/2604.19433 |