Citation: Huanhuan Zhang, Shisong Guo, Yanxiang Chen, Yan Bai, Shuyang Ye, Sha Zhang, Xinyi Chen, Peng Wang, Anqi Li, Long Li, Bingbing Chen, Hua-Yao Li, Huan Liu. MOF derived Pt-In₂O₃ hollow microtube for ultrasensitive ppb-level detection of p-xylene and aging characteristics analysis[J]. Chinese Chemical Letters, ;2026, 37(8): 111328. doi: 10.1016/j.cclet.2025.111328 shu

MOF derived Pt-In₂O₃ hollow microtube for ultrasensitive ppb-level detection of p-xylene and aging characteristics analysis

Huanhuan Zhang ^{a, 1} ,
Shisong Guo ^{a, 1} ,
Yanxiang Chen ^{a, 1} ,
Yan Bai ^a ,
Shuyang Ye ^a ,
Sha Zhang ^a ,
Xinyi Chen ^a ,
Peng Wang ^a ,
Anqi Li ^b ,
Long Li ^d ,
Bingbing Chen ^e ,
Hua-Yao Li ^{a, b, c, d, *,} ,
Huan Liu ^a

a.
School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
b.
School of Future Technology, Huazhong University of Science and Technology, Wuhan 430074, China
c.
Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen 518057, China
d.
Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou 325000, China
e.
School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, China

huayaoli@hust.edu.cn

Received Date: 1 March 2025
Revised Date: 30 April 2025
Accepted Date: 15 May 2025
Available Online: 17 May 2025

Figures(6)

Metal-organic framework (MOF) derived metal oxides and their composites have shown remarkable potential in enhancing the sensitivity and lowering the detection limits of gas sensors, emerging as promising candidates for volatile organic compound (VOC) detection. Here, the Pt-sensitized In₂O₃ hollow microtubes were synthesized from MIL-68 via hydrothermal and sacrificial template methods, demonstrating exceptional trace detection capability (0.01–1 ppm) to p-xylene. The 2% Pt NPs-In₂O₃ showed the highest response of 68.7 at 50 ppb, with a theoretical detection limit as low as 0.027 ppb. The role of Pt was elucidated through comprehensive characterization, revealing that highly dispersed Pt nanoparticles form a well-defined interface with In₂O₃, enhancing gas adsorption, electron transfer, and reaction kinetics, thereby significantly boosting sensor performance. By integrating in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), this study provides fundamental insights into gas-solid interfacial sensing mechanisms, elucidating how Pt modulation enhances gas sensor performance at the molecular level. Additionally, the aging mechanisms of 2% Pt NPs-In₂O₃ sensors were explored through in situ characterization, revealing the evolution of surface morphology and gas adsorption capacity before and after aging under different conditions: 200 ℃/0% RH, 200 ℃/50% RH, and 250 ℃/0% RH for 20 days. These findings offer valuable guidance for improving the long-term stability and reliability of Pt-modified In₂O₃ gas sensors.
- Metal-organic framework,
- Pt-In₂O₃ microtube,
- p-Xylene detection,
- Stability,
- Aging mechanism
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MOF derived Pt-In₂O₃ hollow microtube for ultrasensitive ppb-level detection of p-xylene and aging characteristics analysis