Unveiling the role of oxygen vacancies: Micropore-rich Ovm-TiO2 nanocatalysts for enhanced cataluminescence detection of isobutyraldehyde.
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| Title: | Unveiling the role of oxygen vacancies: Micropore-rich Ovm-TiO2 nanocatalysts for enhanced cataluminescence detection of isobutyraldehyde. |
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| Authors: | Tang, Shan1 (AUTHOR) tangshan@xynun.edu, He, Jiumei1 (AUTHOR), Wan, Chengcheng1 (AUTHOR), Jiang, Li1 (AUTHOR), Zhang, Qianchun1 (AUTHOR) qianchunzhang@qq.com |
| Source: | Applied Surface Science. Jun2026, Vol. 730, pN.PAG-N.PAG. 1p. |
| Subjects: | Oxygen vacancy, Titanium dioxide, Chemical detectors, Gas detectors, Ab-initio calculations, Adsorption (Chemistry) |
| Abstract: | [Display omitted] • Oxygen-vacancy-engineered microporous TiO 2 is synthesized for high-performance CTL sensing. • Outstanding detection of isobutyraldehyde is achieved with a low detection limit of 3 μg/L. • Surface oxygen vacancies are demonstrated to promote the chemical adsorption of O 2 , a key step in the catalytic mechanism. • The surface-mediated enhancement mechanism is elucidated at the atomic level via DFT calculations. This study addresses the urgent demand for simple and sensitive online gas monitoring technologies in the field of environmental safety by developing a high-performance cataluminescence (CTL) sensor based on oxygen-vacancy-rich microporous titanium dioxide (Ovm-TiO 2) for detecting trace isobutyraldehyde (IBL). The Ovm-TiO 2 material, synthesized via a two-step heating process combined with a KBH 4 treatment, features abundant oxygen vacancy defects on its surface, which are pivotal to enhancing sensor performance. Density functional theory (DFT) calculations unravel the surface-mediated mechanism, the oxygen vacancies serve as active sites, drastically enhancing the chemical adsorption and activation of O 2 on the Ovm-TiO 2 surface, which is the key to boosting the cataluminescence efficiency. The developed sensor exhibits outstanding detection performance for IBL, with a wide linear range (0.0100–5.00 mg/L, R 2 = 0.9997), a low detection limit (3 μg/L), and achieved recovery rates of 87.6%–107% with good reproducibility (relative standard deviation, RSD: 5.3%–9.0%) in practical sample analysis. This work not only provides a viable online monitoring solution for IBL but also elucidates the CTL enhancement mechanism at the atomic level, offering important theoretical foundations and practical insights for designing highly sensitive gas sensors. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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