Moisture-Resistant and Highly Selective NH<sub>3</sub> Sensor Based on CdS/WS<sub>2</sub> Composite Heterojunction

Zhang, Jinzhu; Zhang, Min; Wang, Shuying; Wu, Zhaofeng; Zhang, Ze

doi:10.1021/acs.langmuir.3c00465

Cited by 15 publications

(8 citation statements)

References 72 publications

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“…In WS 2 , the stretching vibration peaks of the W–S bond are located at 599 cm –1 . The stretching vibrations of the S–S bond are located at sharp peaks of 1160 and 885 cm –1 . For the spectra of pure PANI, the main characteristic peak located at 1568 cm –1 is attributed to the NQN tensile vibration of the quinone ring, whereas 1491 cm –1 corresponds to the NBN absorption vibration of the benzene structure .…”

Section: Resultsmentioning

confidence: 99%

1D/2D Heterostructured WS₂@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

Wang,

Tang,

Song

et al. 2024

ACS Appl. Mater. Interfaces

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Flexible and room-temperature (RT) ammonia gas sensors are needed for exhaled breath detection and recognition. Two-dimensional transition metal disulfides are potential materials for RT gas sensing because of their low band gap and a large number of edge-exposed sites that can provide strong binding to gas molecules. In this work, a 1D/2D heterostructured composite material of 2D tungsten disulfide (WS 2 ) modified with 1D polyaniline (PANI) was proposed. The fibrous PANI adsorbed on the edges and inserted in the interlayers of the laminated WS 2 provide more diffusion channels for the ammonia gas and act as sensing sites. The WS 2 @PANI-based sensor shows high selectivity for ammonia with satisfying reproducibility and long-term stability. A response of 216.3% and a short response/recovery time of 25 s/ 39 s were achieved for 100 ppm ammonia gas. The sensing mechanism was investigated in detail via complex impedance spectra and in situ FT-IR, which was attributed to the synergistic effect of WS 2 and PANI. The excellent sensing performance coupled with its resistance to thermal and humidity interference endows the WS 2 @PANI-based sensor with potential for human exhaled detection and wearable electronics.

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Section: Resultsmentioning

confidence: 99%

1D/2D Heterostructured WS₂@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

Wang,

Tang,

Song

et al. 2024

ACS Appl. Mater. Interfaces

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“…A narrower band gap reflected that the energy required to generate the intrinsic excitation was reduced, making it easier for electrons to transition from the valence band to the conduction band. The increased free electrons made it easier for O 2 to acquire electrons from the conduction band of CG-5, resulting in more chemisorbed oxygen on the surface, which contributed to improving the gas sensitivity. − …”

Section: Resultsmentioning

confidence: 99%

Moisture-Independent Detection of n-Propanol Using a Kinetic Gas Sensor Based on CdS Nanorods Coated with Reduced Graphene Oxide

Gao,

Zhou,

Kong

et al. 2023

ACS Appl. Nano Mater.

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In the era of intelligent big data with the rapid expansion of information, real-time detection is becoming an essential criterion for evaluating gas sensors. It is of great significance for the rapid and precise detection of hazardous volatile gases such as n-propanol. In this study, the nanorod-like semiconductor metal sulfide CdS coated with reduced graphene oxide (rGO) nanosheets was utilized to construct a high-performance sensor capable of ultrarapid and accurate n-propanol detection. The sensor based on the CdS/rGO nanocomposite with 0.5 wt% rGO (CG-5) exhibited only 1 s for both response and recovery time to 100 ppm n-propanol, which were shortened by 13 and 2 times compared to pristine CdS, respectively. Meanwhile, the sensor response of CG-5 enhanced 3-fold that of pristine CdS. Additionally, the hydrophobic rGO component in the hybrid endowed the sensor with a strong moisture-interference resistance over 20–98% relative humidity. The excellent selectivity, repeatability, and long-term stability for n-propanol detection were demonstrated as well. The exceptional enhancement in the sensing performance of CG-5 can be ascribed to several contributing factors, including its geometric configuration, weakened hydrophilicity, lowered activation energy, and additional active sites at the heterointerface between CdS and rGO. The rational design of CG-5 made it a promising candidate for the rapid, sensitive, and reliable detection of n-propanol.

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“…The sensor was fairly resistant to humidity interference in the range of 10%-95% RH. The fewer O-H bonds-as confirmed by FTIR analysis-led to poor adsorption of water molecules [100].…”

Section: Composite or Decorated Ws 2 Gas Sensorsmentioning

confidence: 90%

Resistive gas sensors for the detection of NH₃ gas based on 2D WS₂, WSe₂, MoS₂, and MoSe₂: a review

Mirzaei,

Alizadeh,

Ansari

et al. 2024

Nanotechnology

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Transition metal dichalcogenides (TMDs) with a two-dimensional (2D) structure and semiconducting features are highly favorable for the production of NH3 gas sensors. Among the TMD family, WS2, WSe2, MoS2, and MoSe2 exhibit high conductivity and a high surface area, along with high availability, reasons for which they are favored in gas-sensing studies. In this review, we have discussed the structure, synthesis, and NH3 sensing characteristics of pristine, decorated, doped, and composite-based WS2, WSe2, MoS2, and MoSe2 gas sensors. Both experimental and theoretical studies are considered. Furthermore, both room temperature and higher temperature gas sensors are discussed. We also emphasized the gas-sensing mechanism. Thus, this review provides a reference for researchers working in the field of 2D TMD gas sensors.

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Moisture-Resistant and Highly Selective NH₃ Sensor Based on CdS/WS₂ Composite Heterojunction

Cited by 15 publications

References 72 publications

1D/2D Heterostructured WS₂@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

1D/2D Heterostructured WS₂@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

Moisture-Independent Detection of n-Propanol Using a Kinetic Gas Sensor Based on CdS Nanorods Coated with Reduced Graphene Oxide

Resistive gas sensors for the detection of NH₃ gas based on 2D WS₂, WSe₂, MoS₂, and MoSe₂: a review

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Moisture-Resistant and Highly Selective NH3 Sensor Based on CdS/WS2 Composite Heterojunction

Cited by 15 publications

References 72 publications

1D/2D Heterostructured WS2@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

1D/2D Heterostructured WS2@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

Moisture-Independent Detection of n-Propanol Using a Kinetic Gas Sensor Based on CdS Nanorods Coated with Reduced Graphene Oxide

Resistive gas sensors for the detection of NH3 gas based on 2D WS2, WSe2, MoS2, and MoSe2: a review

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Moisture-Resistant and Highly Selective NH₃ Sensor Based on CdS/WS₂ Composite Heterojunction

1D/2D Heterostructured WS₂@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

1D/2D Heterostructured WS₂@PANI Composite for Highly Sensitive, Flexible, and Room Temperature Ammonia Gas Sensor

Resistive gas sensors for the detection of NH₃ gas based on 2D WS₂, WSe₂, MoS₂, and MoSe₂: a review