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Transferable Two-Dimensional Hydrophobic Metal-Organic Framework Encapsulation of MoS2-Based Humidity-Resistant NO2 Sensors
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DOI：10.1021/acssensors.6c00547.png)
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Abstract
En 中文
Humidity deteriorates the performance and detection accuracy of gas sensors, especially for two-dimensional (2D) materials with large specific surface areas. Here, we proposed a hydrophobic encapsulation strategy for molybdenum disulfide (MoS2) using a porous metal-organic framework (MOF), poly[Fe(benzimidazole)2], denoted as Fen(bim)2n, to effectively suppress the adsorption of H2O molecules. By ammonia-assisted chemical vapor deposition, large Fen(bim)2n flakes with lateral dimensions up to 72 × 72 μm were synthesized on mica. Owing to the hydrophilic nature of mica, the Fen(bim)2n flakes could be easily peeled off from mica using polydimethylsiloxane (PDMS) soaked in water and subsequently transferred onto MoS2 without contamination, forming a transferable hydrophobic encapsulation layer. The Fen(bim)2n/MoS2 heterojunction exhibited highly humidity-resistant NO2 sensing performance with only a 4.28% relative response variation across 40–70% relative humidity (RH) at room temperature. Compared to bare MoS2, the response of Fen(bim)2n/MoS2 to 500 ppb NO2 increased from 0.53 to 2.03 at 70% RH, with a low practical limit of detection (LOD) of 20 ppb. This improvement not only arose from the hydrophobic Fen(bim)2n layer that suppressed H2O adsorption on the MoS2 but also benefited from the charge transfer in Fen(bim)2n/MoS2, demonstrating the effectiveness of this encapsulation strategy in mitigating humidity-induced sensing performance fluctuation.
Keywords:
chemical vapor deposition
2D metal−organic framework
hydrophobic encapsulation
room temperature
gas sensor
humidity resistance
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9.1
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975
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2.6W
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