Effect of CTAB on the Morphology of Sn-MOF and the Gas Sensing Performance of SnO<sub>2</sub> with Different Crystal Phases for H<sub>2</sub> Detection

Effect of CTAB on the Morphology of Sn-MOF and the Gas Sensing Performance of SnO<sub>2</sub> with Different Crystal Phases for H<sub>2</sub> Detection

Herein, a facile strategy was proposed to enhance the gas sensing performance of SnO<sub>2</sub> for H<sub>2</sub> by regulating its crystalline phase composition. Sn-based metal–organic framework (Sn-MOF) precursors with different morphologies were synthesized by introducing...

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Bibliographic Details
Main Authors: Manyi Liu, Liang Wang, Shan Ren, Bofeng Bai, Shouning Chai, Chi He, Chunli Zheng, Xinzhe Li, Xitao Yin, Chunbao Charles Xu
Format: Article
Language:English
Published: MDPI AG 2025-05-01
Series:Chemosensors
Subjects:
Sn-MOF
gas sensing
CTAB
SnO<sub>2</sub> crystal phases
H<sub>2</sub> detection
Online Access:https://www.mdpi.com/2227-9040/13/5/192
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Summary:Herein, a facile strategy was proposed to enhance the gas sensing performance of SnO<sub>2</sub> for H<sub>2</sub> by regulating its crystalline phase composition. Sn-based metal–organic framework (Sn-MOF) precursors with different morphologies were synthesized by introducing the surfactant cetyltrimethylammonium bromide (CTAB). Upon calcination, these precursors yielded either mixed-phase (orthorhombic and tetragonal, SnO<sub>2</sub>-C) or single-phase (pure tetragonal, SnO<sub>2</sub>-NC) SnO<sub>2</sub> nanoparticles. Structural characterization and gas sensing tests revealed that SnO<sub>2</sub>-C exhibited a high response of 7.73 to 100 ppm H<sub>2</sub> at 280 °C, more than twice that of SnO<sub>2</sub>-NC (3.75). Moreover, SnO<sub>2</sub>-C demonstrated a faster response/recovery time (10/56 s), high selectivity, a ppb-level detection limit (~79 ppb), and excellent long-term stability. Notably, although the addition of CTAB reduced the specific surface area of SnO<sub>2</sub>, the resulting lower surface area minimized oxygen exposure during calcination, facilitating the formation of a mixed-phase heterostructure. In addition, the calcination atmosphere of SnO<sub>2</sub>-C (flowing air or Ar) was adjusted to further investigate the role of the crystal phase in gas sensing performance. The results clearly demonstrated that mixed-phase SnO<sub>2</sub> exhibited superior sensing performance, achieving a higher sensitivity and a faster response to H<sub>2</sub>. These findings underscored the critical role of crystal phase engineering in the design of high-performance gas sensing materials.
ISSN:2227-9040

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