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<p>The construction of semiconductor heterojunctions is a viable approach for enhancing charge separation and improving the SERS performance of semiconductor substrates. In this work, a MoO<sub>3</sub>/TiO<sub>2</sub> (MT) heterojunction SERS substrate was developed by integrating oxygen-vacancy-rich molybdenum oxide with titanium dioxide. The optimized MT substrate achieved an ultralow detection limit of 10<sup>–10</sup>&#xa0;M for methylene blue (MB) with an enhancement factor as high as 8.09 × 10<sup>9</sup>. The superior SERS activity of the MT arises from the synergistic contributions of oxygen vacancies and heterojunction coupling. Oxygen vacancies in MoO<sub>3</sub> facilitate strong adsorption of target molecules and provide efficient pathways for photogenerated electron migration, while the band alignment between TiO<sub>2</sub> and MoO<sub>3</sub> promotes effective charge separation. Together, these effects significantly boost the SERS sensitivity, stability, and reliability of the substrate. The proposed MoO<sub>3</sub>/TiO<sub>2</sub> system provides a robust and cost-effective platform for ultrasensitive detection of organic pollutants, showing enormous application potential in environmental monitoring and public safety.</p>

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Vacancy-engineered MoO3/TiO2 heterojunctions for high-performance SERS detection of organic contaminants

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Jia Li,
  • Dongdong Zhu

摘要

The construction of semiconductor heterojunctions is a viable approach for enhancing charge separation and improving the SERS performance of semiconductor substrates. In this work, a MoO3/TiO2 (MT) heterojunction SERS substrate was developed by integrating oxygen-vacancy-rich molybdenum oxide with titanium dioxide. The optimized MT substrate achieved an ultralow detection limit of 10–10 M for methylene blue (MB) with an enhancement factor as high as 8.09 × 109. The superior SERS activity of the MT arises from the synergistic contributions of oxygen vacancies and heterojunction coupling. Oxygen vacancies in MoO3 facilitate strong adsorption of target molecules and provide efficient pathways for photogenerated electron migration, while the band alignment between TiO2 and MoO3 promotes effective charge separation. Together, these effects significantly boost the SERS sensitivity, stability, and reliability of the substrate. The proposed MoO3/TiO2 system provides a robust and cost-effective platform for ultrasensitive detection of organic pollutants, showing enormous application potential in environmental monitoring and public safety.