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<p>Conventional gas sensing materials (e.g., metal oxides) suffer from deficient sensitivity and serve cross-sensitivity issues due to the lack of efficient adsorption sites. Herein, the heteroatom atomically doping strategy is demonstrated to significantly enhance the sensing performance of metal oxides-based gas sensing materials. Specifically, the Sn atoms were incorporated into porous Fe<sub>2</sub>O<sub>3</sub> in the form of atomically dispersed sites. As revealed by X-ray absorption spectroscopy and atomic-resolution scanning transmission electron microscopy, these Sn atoms successfully occupy the Fe sites in the Fe<sub>2</sub>O<sub>3</sub> lattice, forming the unique Sn–O–Fe sites. Compared to Fe–O–Fe sites (from bare Fe<sub>2</sub>O<sub>3</sub>) and Sn–O–Sn sites (from SnO<sub>2</sub>/Fe<sub>2</sub>O<sub>3</sub> with high Sn loading), the Sn–O–Fe sites on porous Fe<sub>2</sub>O<sub>3</sub> exhibit a superior sensitivity (<i>R</i><sub>g</sub>/<i>R</i><sub>a</sub> = 2646.6) to 1&#xa0;ppm NO<sub>2</sub>, along with dramatically increased selectivity and ultra-low limits of detection (10&#xa0;ppb). Further theoretical calculations suggest that the strong adsorption of NO<sub>2</sub> on Sn–O–Fe sites (N atom on Sn site, O atom on Fe site) contributes a more efficient gas response, compared to NO<sub>2</sub> on Fe–O–Fe sites and other gases on Sn–O–Fe sites. Moreover, the incorporated Sn atoms reduce the bandgap of Fe<sub>2</sub>O<sub>3</sub>, not only facilitating the electron release but also increasing the NO<sub>2</sub> adsorption at a low working temperature (150&#xa0;°C). This work introduces an effective strategy to construct effective adsorption sites that show a unique response to specific gas molecules, potentially promoting the rational design of atomically modified gas sensing materials with high sensitivity and high selectivity.</p><p></p>

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Specific Sn–O–Fe Active Sites from Atomically Sn-Doping Porous Fe2O3 for Ultrasensitive NO2 Detection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月26日

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  • Yihong Zhong,
  • Guotao Yuan,
  • Dequan Bao,
  • Yi Tao,
  • Zhenqiu Gao,
  • Wei Zhao,
  • Shuo Li,
  • Yuting Yang,
  • Pingping Zhang,
  • Hao Zhang,
  • Xuhui Sun

摘要

Conventional gas sensing materials (e.g., metal oxides) suffer from deficient sensitivity and serve cross-sensitivity issues due to the lack of efficient adsorption sites. Herein, the heteroatom atomically doping strategy is demonstrated to significantly enhance the sensing performance of metal oxides-based gas sensing materials. Specifically, the Sn atoms were incorporated into porous Fe2O3 in the form of atomically dispersed sites. As revealed by X-ray absorption spectroscopy and atomic-resolution scanning transmission electron microscopy, these Sn atoms successfully occupy the Fe sites in the Fe2O3 lattice, forming the unique Sn–O–Fe sites. Compared to Fe–O–Fe sites (from bare Fe2O3) and Sn–O–Sn sites (from SnO2/Fe2O3 with high Sn loading), the Sn–O–Fe sites on porous Fe2O3 exhibit a superior sensitivity (Rg/Ra = 2646.6) to 1 ppm NO2, along with dramatically increased selectivity and ultra-low limits of detection (10 ppb). Further theoretical calculations suggest that the strong adsorption of NO2 on Sn–O–Fe sites (N atom on Sn site, O atom on Fe site) contributes a more efficient gas response, compared to NO2 on Fe–O–Fe sites and other gases on Sn–O–Fe sites. Moreover, the incorporated Sn atoms reduce the bandgap of Fe2O3, not only facilitating the electron release but also increasing the NO2 adsorption at a low working temperature (150 °C). This work introduces an effective strategy to construct effective adsorption sites that show a unique response to specific gas molecules, potentially promoting the rational design of atomically modified gas sensing materials with high sensitivity and high selectivity.