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<p>In this study, BaTiO<sub>3</sub> under different preparation conditions and BaTiO<sub>3</sub> doped with Y ions (Ba<sub>1-x</sub>Y<sub>x</sub>TiO<sub>3</sub>, <i>x</i> = 0 ~ 0.01) nanoparticles were prepared by hydrothermal method, and their gas sensitivity to NH<sub>3</sub> at room temperature was investigated. There is no significant difference in the response of pure BaTiO<sub>3</sub> to NH<sub>3</sub> under different preparation conditions. The pure BaTiO<sub>3</sub> exhibits a weak gas response to NH<sub>3</sub> at room temperature, and the gas response is ranging from 10 to 18%. When the Ba/Ti ratio of raw material is 2.0 and hydrothermal temperature at 200℃ for 5 h, the BaTiO<sub>3</sub> powder with small grain size and good dispersion is obtained. After doping of Y<sup>3+</sup>, the NH<sub>3</sub> gas-sensitive performance of Y-doped BaTiO<sub>3</sub> powder is enhanced, which is mostly due to the increased concentration of oxygen vacancy and adsorbed oxygen promoting the reaction between adsorbed oxygen and NH<sub>3</sub>. At room temperature, the response value of Ba<sub>0.998</sub>Y<sub>0.002</sub>TiO<sub>3</sub> to NH<sub>3</sub> gas at 50 ppm is about 36%, and the response time and recovery time are 16 and 14 s, respectively. Compared with BaTiO<sub>3</sub>, the decrease of adsorption energy and work function improves the gas sensitivity of Ba<sub>1-<i>x</i></sub>Y<sub><i>x</i></sub>TiO<sub>3</sub> to NH<sub>3</sub> at room temperature according to the density functional theory (DFT) results. After the doping of Y<sup>3+</sup>, the adsorption energy reduced from −&#xa0;0.7384 to − 1.0522&#xa0;eV and the work function reduced from 7.39 to 6.93 eV. This study offers a promising approach for the synthesis and design of BaTiO<sub>3</sub>-based NH<sub>3</sub> gas sensors operating at room temperature.</p>

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Enhanced NH3 gas-sensing performance of nano-BaTiO3 by Y-modification

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Ruize Hu,
  • Hua Hao,
  • Jingsai Cheng,
  • Feiyang Feng,
  • Qinghu Guo,
  • Zhonghua Yao,
  • Hanxing Liu

摘要

In this study, BaTiO3 under different preparation conditions and BaTiO3 doped with Y ions (Ba1-xYxTiO3, x = 0 ~ 0.01) nanoparticles were prepared by hydrothermal method, and their gas sensitivity to NH3 at room temperature was investigated. There is no significant difference in the response of pure BaTiO3 to NH3 under different preparation conditions. The pure BaTiO3 exhibits a weak gas response to NH3 at room temperature, and the gas response is ranging from 10 to 18%. When the Ba/Ti ratio of raw material is 2.0 and hydrothermal temperature at 200℃ for 5 h, the BaTiO3 powder with small grain size and good dispersion is obtained. After doping of Y3+, the NH3 gas-sensitive performance of Y-doped BaTiO3 powder is enhanced, which is mostly due to the increased concentration of oxygen vacancy and adsorbed oxygen promoting the reaction between adsorbed oxygen and NH3. At room temperature, the response value of Ba0.998Y0.002TiO3 to NH3 gas at 50 ppm is about 36%, and the response time and recovery time are 16 and 14 s, respectively. Compared with BaTiO3, the decrease of adsorption energy and work function improves the gas sensitivity of Ba1-xYxTiO3 to NH3 at room temperature according to the density functional theory (DFT) results. After the doping of Y3+, the adsorption energy reduced from − 0.7384 to − 1.0522 eV and the work function reduced from 7.39 to 6.93 eV. This study offers a promising approach for the synthesis and design of BaTiO3-based NH3 gas sensors operating at room temperature.