Molybdenum Carbide Nanoflakes Synthesized Using a Facile Method for 2-Nitrotoluene Sensing at Room Temperature

Gorthala, Guruprasad; Ghosh, Ruma

doi:10.1109/jsen.2023.3241939

Cited by 7 publications

(5 citation statements)

References 35 publications

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“…This proved that the exfoliation of the bulk WS 2 was better when it was probe-sonicated than when ultrasonicated. Increasing the sonication time in the case of bath sonication usually leads to a reduction in not only the thickness of the bulk material but also the lateral dimensions, as we proved in one of our earlier articles [27]. Hence, to get 2D thinner WS 2 nanoflakes, we had to use probe sonication.…”

Section: Nanomaterials Characterizationsmentioning

confidence: 97%

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Gorthala,

Ghosh

2024

Nanotechnology

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The number of layers present in a two-dimensional (2D) nanomaterial plays a critical role in applications that involve surface interaction, for example, gas sensing. This paper reports the synthesis of 2D WS2 nanoflakes using the facile liquid exfoliation technique. The nanoflakes were exfoliated using bath sonication (BS-WS2) and probe sonication (PS-WS2). The thickness of the BS-WS2 was found to range between 70 – 200 nm, and that of PS-WS2 varied from 0.6 to 80 nm, indicating the presence of single to few layers of WS2 when characterized using atomic force microscope (AFM). All the WS2 samples were thoroughly characterized using electron microscopes, X-ray diffractometer, Raman spectroscopy, UV-Visible spectroscopy, Fourier Transform Infrared spectroscope, and thermogravimetric analyser. Both the nanostructured samples were exposed to 2 ppm of NO2 at room temperature. Interestingly, BS-WS2 which comprises of a greater number of WS2 layers exhibited –14.2% response as against –3.4% response of PS-WS2, the atomically thin sample. The BS-WS2 sample was found to be highly selective towards NO2 but was slower (with incomplete recovery) as compared to PS-WS2. The PS-WS2 sample was observed to exhibit –11.9 to – 27.4% response to 2–10 ppm of CO and –3.4 to 35.2% response to 2–10 ppm of NO2 at room temperature, thereby exhibiting the potential to detect two gases simultaneously. These gases could be accurately predicted and quantified if the response times of the PS-WS2 sample were considered. The atomically thin WS2-based sensor exhibited a limit of detection (LOD) of 131 and 81 ppb for CO and NO2, respectively.

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Section: Nanomaterials Characterizationsmentioning

confidence: 97%

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Gorthala,

Ghosh

2024

Nanotechnology

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“…In recent years, two-dimensional transition metal carbides (2D TMCs), such as W 2 C, WC, NbC, and Mo 2 C nanomaterials, have become one of the focal research targets due to unique properties similar to those of ceramics and metals. − Moreover, molybdenum-based materials also show great potential in the fields of catalysis and sensing. , Mo 2 C possesses a strong surface adsorption for active surface charge interactions and a high density of states (DOS) near the Fermi energy level. Besides, with an easily synthetic method and a low cost, Mo 2 C has superior electrical conductivity like pure metal, bringing about the practical applications of a low-power device with unique advantage .…”

Section: Introductionmentioning

confidence: 99%

“…17 The nanoflakes of molybdenum carbide (Mo 2 C) using a simple liquid exfoliation technique reported by Guruprasad et al have manifested that 25−100 ppm of NO 2 , NH 3 , and CO can be tested with −1.5 to −10.77, 1.01 to 8.34, and 4.89 to 8.17% response. 18 Cheng et al from Henan Normal University have found that the adsorption performance of Mo 2 C toward CO could be improved by oxygen functional groups through density functional theory (DFT) calculations. 19 Junkaew et al have investigated the reactivity and selectivity of transition metal carbides such as Mo 2 C and their oxygen functionalized forms toward gas molecules by means of the DFT approach based on plane waves, and the results have demonstrated that oxygen functionalization can improve the selectivity toward NO.…”

Section: Introductionmentioning

confidence: 99%

“…Two phases of nanostructured molybdenum carbide (α-MoC 1– x and β-Mo 2 C) with high porosities synthesized by Cho et al showed an unprecedentedly high signal-to-noise ratio (SNR) with the ability to detect the ppb levels of NH 3 and NO 2 and showed very high ambient stability . The nanoflakes of molybdenum carbide (Mo 2 C) using a simple liquid exfoliation technique reported by Guruprasad et al have manifested that 25–100 ppm of NO 2 , NH 3 , and CO can be tested with −1.5 to −10.77, 1.01 to 8.34, and 4.89 to 8.17% response . Cheng et al from Henan Normal University have found that the adsorption performance of Mo 2 C toward CO could be improved by oxygen functional groups through density functional theory (DFT) calculations .…”

Section: Introductionmentioning

confidence: 99%

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Oxygenated Molybdenum Carbide Nanowires for Enhanced Sensing of Characteristic SF₆ Decomposition Species

Wang,

Wu,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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SF 6 equipment internal insulation faults generate trace amounts of characteristic gases, mainly SO 2 and SO 2 F 2 . Accurately tracing such small amounts of gas at a low temperature is rather necessary for SF 6 equipment status monitoring and fault diagnosis to ensure safe and stable operation of the power system. In this work, we present a gas sensor with ultrahigh sensitivity, excellent low-temperature performance, low detection limits, fast response, and superior recovery performance for detecting SO 2 and SO 2 F 2 , employing molybdenum carbide nanowires with an oxygen content of 13.60% (Mo 2 C-500) as the sensing material. Gassensing test results show that the sensing performance of Mo 2 C enhances with the increase of the oxygen content, and that Mo 2 C-500 shows the most outstanding sensing performance for SO 2 and SO 2 F 2 among all three oxygenated Mo 2 C (oxygen contents of 0, 5.80, and 13.60%). In addition, at the optimum operating temperatures of 250 °C (SO 2 ) and 150 °C (SO 2 F 2 ), the response value (response time) of Mo 2 C-500 is 2.75(24 s) and 3.61(26 s) toward 300 ppm of SO 2 and SO 2 F 2 , and the detection limits for SO 2 and SO 2 F 2 are 0.83 and 1.01 ppm, respectively. Moreover, the potential adsorption mechanism upon SO 2 and SO 2 F 2 by oxygenated Mo 2 C nanowires is further explored by density functional theory (DFT) calculations that the introduction of oxygen promotes the generation of more free electrons and the formation of a deeper electron depletion layer, giving rise to the enhanced sensing response to SO 2 and SO 2 F 2 . This study demonstrates that the Mo 2 C-500 gas sensor with excellent performance and low cost has superior application prospects in detecting SF 6 decomposition species, which serves as a basis for the development of nanogas sensors.

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“…With a response range of 2.14% to 27.33% for 10 to 100 ppm 2-nitrotoluene, the Mo 2 C@5 hours sample demonstrated superior sensing performance and an efficient gas separation technique. 14 Lee and colleagues synthesized single-layer/few-layer V 2 CT x MXene thin-film gas sensors using intercalation and selective etching techniques. With detection limits of 1 ppm for hydrogen and 9 ppm for methane, these sensors were able to detect trace amounts of various gases, including non-polar gases like hydrogen and methane.…”

Section: Introductionmentioning

confidence: 99%

Defective Cr₂CT_x-based sensors with high sensitivity for NO₂ detection at room temperature

Guo,

Han,

Wang

et al. 2024

J. Mater. Chem. A

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Molybdenum Carbide Nanoflakes Synthesized Using a Facile Method for 2-Nitrotoluene Sensing at Room Temperature

Cited by 7 publications

References 35 publications

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Oxygenated Molybdenum Carbide Nanowires for Enhanced Sensing of Characteristic SF₆ Decomposition Species

Defective Cr₂CT_x-based sensors with high sensitivity for NO₂ detection at room temperature

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Molybdenum Carbide Nanoflakes Synthesized Using a Facile Method for 2-Nitrotoluene Sensing at Room Temperature

Cited by 7 publications

References 35 publications

Atomically thin-layered WS2 based resistive sensors for detection of CO and NO2 at room temperature

Atomically thin-layered WS2 based resistive sensors for detection of CO and NO2 at room temperature

Oxygenated Molybdenum Carbide Nanowires for Enhanced Sensing of Characteristic SF6 Decomposition Species

Defective Cr2CTx-based sensors with high sensitivity for NO2 detection at room temperature

Contact Info

Product

Resources

About

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Oxygenated Molybdenum Carbide Nanowires for Enhanced Sensing of Characteristic SF₆ Decomposition Species

Defective Cr₂CT_x-based sensors with high sensitivity for NO₂ detection at room temperature