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Nano-porous hollow Li0.5La0.5TiO3 spheres and electronic structure modulation for ultra-fast H2S detection

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Abstract

Ultra-fast detection of hazardous gases with high selectivity is important for environmental safety monitoring. In this study, we report a Li0.5La0.5TiO3 (LLTO) sensor with an ultrafast response to H2S. We used a simple solvothermal method to controllably synthesize hollow LLTO nano-spheres. The LLTO nano-spheres had a porous surface structure, which provides sufficient channels for diffusion of H2S gas. Response/recovery speeds of 0.7 s/0.8 s were achieved at an optimum working temperature of 340 °C. To further improve the response, the band structure was modulated by Fe doping (FLTO). When doped with Fe3+, more oxygen vacancies were generated which enhanced the chemical absorption of O2 and generation of active oxygen species (O and O2−). Furthermore, the band gap was also narrowed and the conduction band was elevated by 0.44 eV, which promoted charge transfer from the conduction band of FLTO to chemisorbed gas molecules. After doping, the response was 5.5 times as great as that of the pristine LLTO sensor for 30 ppm H2S and the optimum temperature decreased to 300 °C. In addition, the detection limit was as low as 100 ppb. The doped LLTO sensor also had good repeatability and long-term stability.

Graphical abstract: Nano-porous hollow Li0.5La0.5TiO3 spheres and electronic structure modulation for ultra-fast H2S detection

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Publication details

The article was received on 23 Sep 2019, accepted on 27 Oct 2019 and first published on 29 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA10482H
J. Mater. Chem. A, 2020, Advance Article

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    Nano-porous hollow Li0.5La0.5TiO3 spheres and electronic structure modulation for ultra-fast H2S detection

    N. Zheng, X. Li, S. Yan, Q. Wang, R. Qiao, J. Hu, J. Fan, G. Cao and G. Shao, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA10482H

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