Ultrasensitive ammonia gas sensor based on Ti3C2Tx/Ti3AlC2 planar composite at room temperature

Liu, Zhihua; Han, Dejun; Liu, Lulu; Li, Donghui; Han, Xiaomei; Chen, Yi; Liu, Xiaoru; Zhuo, Kai; Cheng, Yongqiang; Sang, Shengbo

doi:10.1016/j.snb.2022.133149

Cited by 20 publications

(15 citation statements)

References 35 publications

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“…Such behavior may be explained via the Langmuir adsorption model similar to those observed for other sensors. 39,40 Accordingly, the calculated highest sensitivity appears at the lowest applied analyte concentration (i.e. at 500 ppb NH 3 ) having a value of 2.8%/ppm, which is significantly better than those published for pristine Ti 3 C 2 T x (inset of Fig.…”

Section: Nh 3 Sensing Performancementioning

confidence: 57%

An ultra-sensitive NH₃ gas sensor enabled by an ion-in-conjugated polycroconaine/Ti₃C₂T_x core–shell composite

et al. 2023

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Section: Nh 3 Sensing Performancementioning

confidence: 57%

An ultra-sensitive NH₃ gas sensor enabled by an ion-in-conjugated polycroconaine/Ti₃C₂T_x core–shell composite

et al. 2023

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“…A Schottky junction was thus formed between MXene and SnS 2 , and the transfer of electrons would occur from SnS 2 to MXene across the contact interface until Fermi levels of MXene and SnS 2 reached equilibrium. The Fermi energy level of MXene/SnS 2 was higher than that of pure MXene, giving the composite material a higher energy-changing ability . When MXene and SnS 2 were connected to form a heterostructure, as shown in Figure c, the diffusion and drift of change carriers resulted in the construction of a depletion region at the interface .…”

Section: Resultsmentioning

confidence: 99%

“…The Fermi energy level of MXene/SnS 2 was higher than that of pure MXene, giving the composite material a higher energy-changing ability. 50 When MXene and SnS 2 were connected to form a heterostructure, as shown in Figure 10c, the diffusion and drift of change carriers resulted in the construction of a depletion region at the interface. 12 Thus, at temperatures below 100 °C, the accumulation of negative charges in MXene would preabsorb more oxygen in air to form more O 2 − on the surface of the sensing materials.…”

Section: Microstructure Of Thementioning

confidence: 99%

MXene/SnS₂ Heterojunction for Detecting Sub-ppm NH₃ at Room Temperature

Sun

Huang

et al. 2023

ACS Appl. Mater. Interfaces

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Detection of ultralow concentrations of ammonia is very important in many applications such as fishing, poultry, agriculture, industry, biomedicine, and clinical diagnosis. However, detecting sub-ppm NH3 remains a challenge for chemiresistive-type gas sensors. Two-dimensional (2D) materials display tremendous potential for effective gas detectors that can be used in these applications. The as-developed MXene/SnS2 heterojunction-based chemiresistive-type sensor presents superior gas-sensing performance toward sub-ppm ammonia at room temperature. The sensor can detect NH3 concentrations down to 10 ppb at room temperature. It also displays excellent long-term stability, with a decline in the response at ∼3.4% for 20 days. The developed sensor also displays good selectivity toward NH3 relative to some potential interferents, such as HCHO, C2H5OH, CH3OH, C3H6O, benzene, and NO2. The measured in situ diffuse-reflectance infrared Fourier transform (DRIFT) spectra confirm that the products of nitric oxides during the chemical reactions occurred at the surface of MXene/SnS2. Density functional theory (DFT) based on the first principles was implemented to compute the adsorption ability of NH3 at the surface of the MXene/SnS2 heterostructure. This indicates that the enhancement in the sensing properties of the MXene/SnS2 heterostructure-based chemosensor could be ascribed to the stronger NH3 adsorption, better catalytical activity, and more effective charge transfer bestowed by the formed heterostructure and the electron-redistribution-assisted stronger extraction of electrons from the sensing material.

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“…When the sensing material is exposed to a reducing gas such as ammonia, the molecules of ammonia react with oxygen ions to produce NO and H 2 O. During this process, the captured electrons return to the conduction band, reducing the electron depletion layer on the surface of the sensing material, thereby increasing the sensor’s conductivity. , Oxygen molecular adsorption and ammonia detection can be represented by the following , normalO 2 ( ads ) + normale − → normalO 2 ( ads ) − 4 normalN normalH 3 ( gas ) + 5 normalO 2 ( ads ) − → 4 normalN normalO false( gas false) + 6 normalH 2 normalO + 5 normale − Herein, the improvement in the sensing performance of the α-Fe 2 O 3 @SnO 2 sensor can mainly be attributed to chemical sensitization and electronic sensitization. In the view of chemical sensitization, the decorated small SnO 2 NPs act as a catalyst for the chemical interaction between the α-Fe 2 O 3 and the ammonia.…”

Section: Resultsmentioning

confidence: 99%

“…During this process, the captured electrons return to the conduction band, reducing the electron depletion layer on the surface of the sensing material, thereby increasing the sensor's conductivity. 56,57 Oxygen molecular adsorption and ammonia detection can be represented by the following 58,59 + O e O 2(ads) 2(ads)…”

Section: Gas-sensing Performancesmentioning

confidence: 99%

Surface Enhancement Effects of Tiny SnO₂ Nanoparticle Modification on α-Fe₂O₃ for Room-Temperature NH₃ Sensing

Xu,

Lin,

Xiong

et al. 2023

Inorg. Chem.

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The development of a gas sensor capable of detecting ammonia with high selectivity and rapid response at room temperature has consistently posed a formidable challenge. To address this issue, the present study utilized a one-step solvothermal method to co-assemble α-Fe 2 O 3 and SnO 2 by evenly covering SnO 2 nanoparticles on the surface of α-Fe 2 O 3 . By controlling the morphology and Fe/Sn mole ratio of the composite, the as-prepared sample exhibits high-performance detection of NH 3 . At room temperature conditions, a gas sensor composed of α-Fe 2 O 3 @3%SnO 2 demonstrates a rapid response time of 14 s and a notable sensitivity of 83.9% when detecting 100 ppm ammonia. Experiments and density functional theory (DFT) calculations suggest that the adsorption capacity of α-Fe 2 O 3 to ammonia is enhanced by the surface effect provided by SnO 2 . Meanwhile, the existence of SnO 2 tailors the pore structure and effective surface area of α-Fe 2 O 3 , creating multiple channels for the diffusion and adsorption of ammonia molecules. Additionally, an N−N heterostructure is formed between α-Fe 2 O 3 and SnO 2 , which enhances the potential energy barrier and improves the ammonia sensing performance. Demonstration experiments have proved that the sensor shows significant advantages over commercial sensors in the process of ammonia detection in agricultural facilities. This work provides new insights into the perspectives on ammonia detection at room temperature.

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Ultrasensitive ammonia gas sensor based on Ti3C2Tx/Ti3AlC2 planar composite at room temperature

Cited by 20 publications

References 35 publications

An ultra-sensitive NH₃ gas sensor enabled by an ion-in-conjugated polycroconaine/Ti₃C₂T_x core–shell composite

An ultra-sensitive NH₃ gas sensor enabled by an ion-in-conjugated polycroconaine/Ti₃C₂T_x core–shell composite

MXene/SnS₂ Heterojunction for Detecting Sub-ppm NH₃ at Room Temperature

Surface Enhancement Effects of Tiny SnO₂ Nanoparticle Modification on α-Fe₂O₃ for Room-Temperature NH₃ Sensing

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Ultrasensitive ammonia gas sensor based on Ti3C2Tx/Ti3AlC2 planar composite at room temperature

Cited by 20 publications

References 35 publications

An ultra-sensitive NH3 gas sensor enabled by an ion-in-conjugated polycroconaine/Ti3C2Tx core–shell composite

An ultra-sensitive NH3 gas sensor enabled by an ion-in-conjugated polycroconaine/Ti3C2Tx core–shell composite

MXene/SnS2 Heterojunction for Detecting Sub-ppm NH3 at Room Temperature

Surface Enhancement Effects of Tiny SnO2 Nanoparticle Modification on α-Fe2O3 for Room-Temperature NH3 Sensing

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An ultra-sensitive NH₃ gas sensor enabled by an ion-in-conjugated polycroconaine/Ti₃C₂T_x core–shell composite

An ultra-sensitive NH₃ gas sensor enabled by an ion-in-conjugated polycroconaine/Ti₃C₂T_x core–shell composite

MXene/SnS₂ Heterojunction for Detecting Sub-ppm NH₃ at Room Temperature

Surface Enhancement Effects of Tiny SnO₂ Nanoparticle Modification on α-Fe₂O₃ for Room-Temperature NH₃ Sensing