Gas sensing performance and charge-transfer mechanism of semiconducting single-walled carbon nanotubes

Tian, Tian; Yin, Huan; Zhang, Luoxi; Zhu, Mingkui; Ma, Defu; Shao, Feng; Hu, Nantao; Yang, Zhi; Zhang, Yafei; Su, Yanjie

doi:10.1016/j.apsusc.2022.155357

Cited by 15 publications

(11 citation statements)

References 27 publications

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“…G – corresponds to a transverse wave mode (TO) at 1556 cm –1 along the axial direction, and G + is assigned to a longitudinal wave mode (LO) at 1574 cm –1 perpendicular to the axial direction. Both wavenumbers agree with previous reports. ,, Composites of MoS 2 and SWCNTs exhibit the same peaks, and increasing CNT content increases the intensity of the associated peaks in the Raman spectrum as shown in panels c–f. This type of nonuniformity in phonon intensity at the D and G bands indicates the presence SWCNTs on the surface of MoS 2 nanosheets.…”

Section: Resultssupporting

confidence: 92%

“…Both wavenumbers agree with previous reports. 30,40,41 Composites of MoS 2 and SWCNTs exhibit the same peaks, and increasing CNT content increases the intensity of the associated peaks in the Raman spectrum as shown in panels c−f. This type of nonuniformity in phonon intensity at the D and G bands indicates the presence SWCNTs on the surface of MoS 2 nanosheets.…”

Section: ■ Results and Discussionmentioning

confidence: 72%

“…Single-walled carbon nanotubes (SWCNTs) are quasi one-dimensional (1D) nanomaterials made up of a single layer of graphitic carbon atoms. The diameter and chirality of SWCNTs have a strong influence on their physical and chemical properties . The conductivity characteristics of SWCNTs can be changed significantly at room temperature due to adsorption/desorption of gas/vapor molecules, which makes them highly sensitive to changes in the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

“…The diameter and chirality of SWCNTs have a strong influence on their physical and chemical properties. 30 The conductivity characteristics of SWCNTs can be changed significantly at room temperature due to adsorption/desorption of gas/vapor molecules, which makes them highly sensitive to changes in the surrounding environment. This results from the interaction between molecules and all surface atoms, enabling SWCNTs to be ideal sensing nanomaterials for highly sensitive gas detection.…”

Section: ■ Introductionmentioning

confidence: 99%

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Detection of DMF and NH₃ at Room Temperature Using a Sensor Based on a MoS₂/Single-Walled Carbon Nanotube Composite

Singh

Kumar

et al. 2023

ACS Appl. Nano Mater.

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Two-dimensional molybdenum disulfide (MoS 2 ) with high surface area and layered structure has received substantial attention for its potential use in detecting volatile organic compounds (VOCs) and trace gases with good relative response and selectivity at room temperature. However, two of the long-standing challenges to broader use of MoS 2 are its poor recovery kinetics and susceptibility to oxidation in a humid environment. To address these issues, we present a chemiresistive sensor based on a MoS 2 /SWCNTs composite as a sensing material for the dual detection of N,N-dimethylformamide (DMF) and ammonia (NH 3 ) at room temperature. MoS 2 supports SWCNTs by providing a superhydrophobic surface and imparting environmental stability along with an increased specific surface area. The composite-based sensor with 4 wt % SWCNTs enabled dual detection of DMF and NH 3 down to 0.1 and 1 ppm, respectively, under ambient conditions. Upon exposure to 5 ppm DMF (response ≈15%), this sensor exhibited p-type conduction with response and recovery times of 160 and 140 s, respectively, whereas, with 5 ppm of NH 3 (response ≈25%, n-type), these times were 126 and 35 s, respectively. Moreover, the composite sensor exhibited high selectivity against various oxidizing and reducing agents as well as good repeatability, long-term stability, and fast reversibility in varied gas atmospheres. We attribute this enhanced sensing performance to the formation of numerous p−n interfaces and synergy between the two nanomaterials. This improves charge transport and leads to a faster response. The experimental work was supplemented by a machine learning-based principal component analysis (PCA) model, which enabled us to identify key dependent variables and confirm the sensor's dual selectivity. These results provide a platform for developing next-generation gas sensors for diverse potential gas-sensing applications.

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Section: Resultssupporting

confidence: 92%

Section: ■ Results and Discussionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Detection of DMF and NH₃ at Room Temperature Using a Sensor Based on a MoS₂/Single-Walled Carbon Nanotube Composite

Singh

Kumar

et al. 2023

ACS Appl. Nano Mater.

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“…Similarly, for gas sensors based on heterostructures, external conditions such as temperature, humidity, and gas molecule concentration significantly influence the sensing performance. [22][23][24] However, the effect of external conditions on the interfacial charge transfer in SWCNT/ graphene vdW heterostructures is yet to be investigated.…”

Section: Introductionmentioning

confidence: 99%

External condition-induced interfacial charge transfer in single-walled carbon nanotube/graphene van der Waals heterostructures

Yin,

Zhang,

Tian

et al. 2023

J. Mater. Chem. C

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Nanosheet-type tin oxide on carbon nanotube for gas sensing

Choi

Tsuruta

Masuda

2023

Chemical Engineering Journal

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Gas sensing performance and charge-transfer mechanism of semiconducting single-walled carbon nanotubes

Cited by 15 publications

References 27 publications

Detection of DMF and NH₃ at Room Temperature Using a Sensor Based on a MoS₂/Single-Walled Carbon Nanotube Composite

Detection of DMF and NH₃ at Room Temperature Using a Sensor Based on a MoS₂/Single-Walled Carbon Nanotube Composite

External condition-induced interfacial charge transfer in single-walled carbon nanotube/graphene van der Waals heterostructures

Nanosheet-type tin oxide on carbon nanotube for gas sensing

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Gas sensing performance and charge-transfer mechanism of semiconducting single-walled carbon nanotubes

Cited by 15 publications

References 27 publications

Detection of DMF and NH3 at Room Temperature Using a Sensor Based on a MoS2/Single-Walled Carbon Nanotube Composite

Detection of DMF and NH3 at Room Temperature Using a Sensor Based on a MoS2/Single-Walled Carbon Nanotube Composite

External condition-induced interfacial charge transfer in single-walled carbon nanotube/graphene van der Waals heterostructures

Nanosheet-type tin oxide on carbon nanotube for gas sensing

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Product

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Detection of DMF and NH₃ at Room Temperature Using a Sensor Based on a MoS₂/Single-Walled Carbon Nanotube Composite

Detection of DMF and NH₃ at Room Temperature Using a Sensor Based on a MoS₂/Single-Walled Carbon Nanotube Composite