A derivatization-assisted SERS platform using Au TOHs/hydrogel for point-of-use detection of trace ozone in air.

Authors

Xinyuan Zhao, Bingxin Xu, Wei Zhang, Haiyan Wei, Yu Zhang, Wenwen Chen, Ming Shang, Cuijuan Wang

Published in

Mikrochimica acta. Volume 193. Issue 10. Sep 28, 2026. Epub Sep 28, 2026.

Abstract

A portable ozone detection strategy is reported based on derivatization-assisted surface-enhanced Raman spectroscopy (SERS). The strategy integrates active sampling, chemical derivatization, and signal enhancement using high-index gold trisoctahedrons embedded in a porous hydrogel (Au TOHs/hydrogel), assembled into a 48-well microdevice. Ozone is selectively captured by eugenol and converted to formaldehyde, which reacts with 3-methyl-2-benzothiazolinone hydrazone (MBTH) to form a Raman-active azo compound, enabling sensitive detection. The SERS signal at 1270 cm^- 1 exhibited a strong linear correlation with the logarithm of analyte concentration (R² = 0.996). The limit of detection under simulated air conditions is 5.80 × 10^- 6 mg/m³. The SERS sensor demonstrated high stability, spatial uniformity, and reproducibility (RSD < 10%), along with good selectivity against common volatile organic compounds. Validation with air samples and comparison with ultraviolet-visible UV-vis spectrophotometry further supports its applicability. This cost-effective and user-friendly platform shows potential for point-of-use detection of trace ozone.

PMID:
42802235
Bibliographic data and abstract were imported from PubMed on 28 Sep 2026.

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