Dual-selective detection of CO and CH4 based on hierarchical porous In2O3 nanoflowers with Pd modification

Han, Liuyang; Zhang, Saisai; Zhang, Bo; Zhang, Bowen; Wang, Yan; Bala, Hari; Zhang, Zhanying

doi:10.1016/j.jmat.2021.12.006

Cited by 7 publications

(3 citation statements)

References 51 publications

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“…Figure S15b shows the response curve of a 0.2% Au–In 2 O 3 sensor at 240 °C under different humidity conditions, and it can be observed that the response gradually decreases as the relative humidity increases. Table S1 demonstrates the sensing performance of the 0.2% Au-doped In 2 O 3 sensor prepared in this subject with other CO sensors reported in the literature. − Lower detection limits, faster response recovery rates, and higher response values prove that Au-doped In 2 O 3 sensors are more advantageous for CO detection.…”

Section: Resultsmentioning

confidence: 78%

Metal–Organic Framework-Derived Au-Doped In₂O₃ Nanotubes for Monitoring CO at the ppb Level

Zhao,

Yu,

Wang

et al. 2024

ACS Sens.

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Achieving selective detection of ppb-level CO is important for air quality testing at industrial sites to ensure personal safety. Noble metal doping enhances charge transfer, which in turn reduces the detection limit of metal oxide gas sensors. In this work, metal−organic framework-derived Au-doped In 2 O 3 nanotubes with high electrical conductivity are synthesized by pyrolysis of the Au-doped metal− organic framework (In-MIL-68) as a template. Gas-sensing experiments reveal that the detection limit of 0.2% Au-doped In 2 O 3 nanotubes (0.2% Au, mass fraction) is as low as 750 ppb. Meanwhile, the sensing material shows a response value of 18.2 to 50 ppm of CO at 240 °C, which is about 2.8 times higher than that of pure In 2 O 3 . Meanwhile, the response and recovery times are short (37 s/86 s). The gas-sensing mechanism of CO is uncovered by in situ DRIFTS through the reaction intermediates. In addition, first-principles calculations suggest that Au doping of In 2 O 3 significantly enhances its adsorption energy for CO and improves the electron transfer properties. This study reveals a novel synthesis pathway for Au-doped In 2 O 3 nanotubular structures and their potential application in low concentration CO detection.

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Section: Resultsmentioning

confidence: 78%

Metal–Organic Framework-Derived Au-Doped In₂O₃ Nanotubes for Monitoring CO at the ppb Level

Zhao,

Yu,

Wang

et al. 2024

ACS Sens.

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“…Table S1 displays the gas-sensitive performance of the In 2 O 3 /Fe 2 O 3 gas sensor in this work compared to other CO sensors in the literature. − It can be shown that the In 2 O 3 /Fe 2 O 3 sensor possesses superior performance such as ultrahigh response and shorter response/recovery time.…”

Section: Resultsmentioning

confidence: 96%

Fast and Sensitive Detection of CO by Bi-MOF-Derived Porous In₂O₃/Fe₂O₃ Core–Shell Nanotubes

Zhao,

Cao,

Wang

et al. 2023

ACS Sens.

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In 2 O 3 is an optimal material for sensitive detection of carbon monoxide (CO) gas due to its low resistivity and high catalytic activity. Yet, the gas response dynamics between the CO gas molecules and the surface of In 2 O 3 is limited by its solid structure, resulting in a weak gas response value and sluggish electron transport. Herein, we report a strategy to synthesize porous In 2 O 3 /Fe 2 O 3 core−shell nanotubes derived from In/Fe bimetallic organic frameworks. The fabricated porous In 2 O 3 /Fe 2 O 3 -4 core−shell nanotubes present outstanding gas sensitivities, including a response value 3.8 times (33.7 to 200 ppm CO at 260 °C) higher than that of monometallic-derived In 2 O 3 (8.7), ultrashort response and recovery times (23/76 s) to 200 ppm CO, low detection limit (1 ppm), promising selectivity, and long-term stability. The enhanced sensing mechanisms are clarified by the combination of experiment and firstprinciples calculations, showing that the synergetic strategy of higher adsorption energy, increased electrical conductivity, higher electron transfer numbers, and larger specific surface area of porous core−shell structures promotes the surface activity and charge transfer efficiency. The present work paves a way to tune gas-sensing materials with special morphologies for the development of highperformance CO sensors. KEYWORDS: bimetallic organic frameworks, In 2 O 3 /Fe 2 O 3 core−shell nanotubes, porous structure, CO, gas sensing

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“…Gas disasters pose a major threat to coal mine safety, with methane explosions and carbon monoxide poisoning being the primary causes of substantial loss of life and property. , Detecting gas concentrations in coal mines and providing timely, accurate early warnings are therefore crucial for protecting human lives. Although methane is a major gas component, its simple, stable alkane structure makes detection difficult.…”

Section: Introductionmentioning

confidence: 99%

CeO₂/In₂O₃ Hollow Nanosphere Heterojunction for Real-Time CO Monitoring under High Humidity

Li,

Zhang,

Han

et al. 2024

ACS Appl. Nano Mater.

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Real-time monitoring of carbon monoxide (CO) is crucial for ensuring human safety. However, the accuracy of the CO detection is significantly diminished by high ambient humidity. This study focuses on synthesizing CeO 2 /In 2 O 3 hollow nanospheres with varying CeO 2 contents (0, 1, 2, 3 mol %) using a twostep method. Testing under different humidity conditions demonstrates that incorporating CeO 2 not only amplifies the response rate of pure In 2 O 3 sensors (from 1.4 to 1.65 at 100 ppm of CO) but also curtails the response and recovery times (from 11 s/27 s to 6 s/23 s) at 280 °C. Furthermore, CeO 2 /In 2 O 3 composite sensors exhibit improved selectivity, repeatability, and long-term stability. Notably, the robust CO detection performance under high humidity verifies that the fabricated CeO 2 /In 2 O 3 sensors can monitor CO in humid environments. The enhanced performance stems from the unique hollow structure, abundant mesopores on the surface, and the heterojunction between CeO 2 and In 2 O 3 .

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Dual-selective detection of CO and CH4 based on hierarchical porous In2O3 nanoflowers with Pd modification

Cited by 7 publications

References 51 publications

Metal–Organic Framework-Derived Au-Doped In₂O₃ Nanotubes for Monitoring CO at the ppb Level

Metal–Organic Framework-Derived Au-Doped In₂O₃ Nanotubes for Monitoring CO at the ppb Level

Fast and Sensitive Detection of CO by Bi-MOF-Derived Porous In₂O₃/Fe₂O₃ Core–Shell Nanotubes

CeO₂/In₂O₃ Hollow Nanosphere Heterojunction for Real-Time CO Monitoring under High Humidity

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Dual-selective detection of CO and CH4 based on hierarchical porous In2O3 nanoflowers with Pd modification

Cited by 7 publications

References 51 publications

Metal–Organic Framework-Derived Au-Doped In2O3 Nanotubes for Monitoring CO at the ppb Level

Metal–Organic Framework-Derived Au-Doped In2O3 Nanotubes for Monitoring CO at the ppb Level

Fast and Sensitive Detection of CO by Bi-MOF-Derived Porous In2O3/Fe2O3 Core–Shell Nanotubes

CeO2/In2O3 Hollow Nanosphere Heterojunction for Real-Time CO Monitoring under High Humidity

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Metal–Organic Framework-Derived Au-Doped In₂O₃ Nanotubes for Monitoring CO at the ppb Level

Metal–Organic Framework-Derived Au-Doped In₂O₃ Nanotubes for Monitoring CO at the ppb Level

Fast and Sensitive Detection of CO by Bi-MOF-Derived Porous In₂O₃/Fe₂O₃ Core–Shell Nanotubes

CeO₂/In₂O₃ Hollow Nanosphere Heterojunction for Real-Time CO Monitoring under High Humidity