Hydrothermally grown α-MnO2 interlocked mesoporous micro-cubes of several nanocrystals as selective and sensitive nitrogen dioxide chemoresistive gas sensors

Shinde, Pritamkumar V.; Xia, Qixun; Ghule, Balaji G.; Shinde, Nanasaheb M.; Jeong, Seonghee; Kim, Kwang Ho; Mane, Rajaram S.

doi:10.1016/j.apsusc.2018.02.144

Cited by 37 publications

(6 citation statements)

References 39 publications

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“…When WO 3 sensor film is open to ambient air, the air molecules of oxygen adsorb on its surface by withdrawing electrons to form surface adsorbed oxygen species, which eventually can reduce the number of electrons from the conduction band of WO 3 . The oxygen adsorbed on surface of the WO 3 sensor film helps to manipulate the resistance of the gas sensor as the adsorbed oxygen is temperature dependent [34]. In our case, O 2 − is dominant as the WO 3 sensor is operated at room temperature.…”

Section: Sensing Mechanismmentioning

confidence: 82%

Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO₃ nanobricks

Shaikh

Ghule

Shinde

et al. 2020

Mater. Res. Express

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Mesoporous tungsten oxide nanobricks (WO 3 NBs) are successfully prepared via a simple and costeffective hydrothermal synthesis method. The as-synthesized WO 3 NBs demonstrate a high sensitivity and selectivity when used for liquid ammonia and humidity sensor activities at room temperature (27°C). The monoclinic crystal structure has beencorroborated from thex-ray diffraction studies and the specific surface area is estimated to be 38.74 m 2 g −1 . A larger specific surface area has significantly facilitated a fast gas adsorption/desorption process. The WO 3 NBs notably exhibite gas sensitivity and selectivity for volatile organic compounds (VOCs) such as ammonia; however, a moderate performance is displayed with different oxidizing and reducing agents at room-temperature, namely: toluene, methanol, ethanol, and acetone. The sensor has offered a commercial potential with an extremely high response (75%), a 15-day operational stability at 100 ppm concentration of ammonia, and a practically remarkable ultra-high 8/5 s response/recovery time. The WO 3 NBs-based humidity sensor endows a 32% resistance response at 20% relative humidity, with a quick response/recovery time of 10/8 s; which is due to unique surface architecture of these NBs. Abbreviations VOC volatile organic compound; XRDx-ray diffraction

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Section: Sensing Mechanismmentioning

confidence: 82%

Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO₃ nanobricks

Shaikh

Ghule

Shinde

et al. 2020

Mater. Res. Express

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“…Raman spectrum shows three prominent peaks at 308, 370, and 651 cm −1 (Figure 4b). The strongest peak at 652 cm −1 is because of the Mn-O symmetric stretching vibration bond of the MnO6 octahedron [36]. The weaker Raman peaks at 308 and 370 cm −1 are assigned to the lattice vibrations on the Mn-O bond and bending vibrations of Mn-O-Mn in MnO2, respectively [37,38].…”

Section: Characterizations and Properties Of Synthesized α-Mno 2 Nanowiresmentioning

confidence: 99%

α-MnO2 Nanowires as Potential Scaffolds for a High-Performance Formaldehyde Gas Sensor Device

Ibrahim

Kumar²,

Algadi

et al. 2021

Coatings

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Herein, we report a chemi-resistive sensing method for the detection of formaldehyde (HCHO) gas. For this, α-MnO2 nanowires were synthesized hydrothermally and examined for ascertaining their chemical composition, crystal phase, morphology, purity, and vibrational properties. The XRD pattern confirmed the high crystallinity and purity of the α-MnO2 nanowires. FESEM images confirmed a random orientation and smooth-surfaced wire-shaped morphologies for as-synthesized α-MnO2 nanowires. Further, the synthesized nanowires with rounded tips had a uniform diameter throughout the length of the nanowires. The average diameter of the α-MnO2 nanowires was found to be 62.18 nm and the average length was ~2.0 μm. Further, at an optimized temperature of 300 °C, the fabricated HCHO sensor based on α-MnO2 nanowires demonstrated gas response, response, and recovery times of 19.37, 18, and 30 s, respectively.

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“…Among the various SMOs, manganese oxide (MnO 2 ) exhibits large crystallographic varieties such as α-, β-, χ-, δ-, and ε-phases depending on the arrangement of the MnO 6 octahedral subunits. 24 The polymorphic forms of MnO 2 are advantageous for customizing the physical properties; hence, optimal performance can be realized for specific applications. In addition, structural engineering has been conducted involving the synthesis of 2D Mn oxide NSs with subnanoscale thicknesses, and their unique 2D layered structures have been employed for energy storage and biomedical applications.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Temperature-Dependent n-to-p-Type Transition of 2D Mn Oxide Nanosheets toward NO₂ for Flexible Gas Sensor Application

et al. 2022

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Rapid and on-site detection of nitrogen dioxide (NO 2 ) is important for environmental monitoring as NO 2 is a highly toxic chemical emitted from automobiles and power plants.In this study, we proposed atomically thin two-dimensional (2D) Mn oxide nanosheets (NSs) assembled on a flexible heating substrate for application in flexible and wearable NO 2 sensors. A liquid-phase exfoliation technique was used to obtain individual Mn oxide layers that formed a homogeneous suspension. A flexible heater was fabricated by partially embedding Ag nanotubes (NTs) on the surface of a colorless polyimide (CPI) film for use as a sensor substrate. Temperature-dependent NO 2 sensing properties were investigated via control of the operating temperature using a Ag NT-embedded CPI heating film. As a result, the n-type sensing behavior of the Mn oxide NSs exhibited a response [(R gas − R air )/R air × 100 (%)] of 1.20 ± 0.21% for 20 ppm NO 2 at room temperature (25 °C). Meanwhile, n−p transition occurred with p-type sensing property as the operating temperature increased to 150 °C with an improved response [(R air − R gas )/R air × 100 (%)] of 4.10 ± 0.42% for 20 ppm NO 2 . The characteristic n−p transition of Mn oxide NSs at different operating temperatures was evidenced by the surface-adsorbed oxygen ions (i.e., O 2 − and O − ) and nitrate species (NO 3 − and NO 3 2−).

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Hydrothermally grown α-MnO2 interlocked mesoporous micro-cubes of several nanocrystals as selective and sensitive nitrogen dioxide chemoresistive gas sensors

Cited by 37 publications

References 39 publications

Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO₃ nanobricks

Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO₃ nanobricks

α-MnO2 Nanowires as Potential Scaffolds for a High-Performance Formaldehyde Gas Sensor Device

Temperature-Dependent n-to-p-Type Transition of 2D Mn Oxide Nanosheets toward NO₂ for Flexible Gas Sensor Application

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Hydrothermally grown α-MnO2 interlocked mesoporous micro-cubes of several nanocrystals as selective and sensitive nitrogen dioxide chemoresistive gas sensors

Cited by 37 publications

References 39 publications

Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO3 nanobricks

Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO3 nanobricks

α-MnO2 Nanowires as Potential Scaffolds for a High-Performance Formaldehyde Gas Sensor Device

Temperature-Dependent n-to-p-Type Transition of 2D Mn Oxide Nanosheets toward NO2 for Flexible Gas Sensor Application

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Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO₃ nanobricks

Continuous hydrothermal flow-inspired synthesis and ultra-fast ammonia and humidity room-temperature sensor activities of WO₃ nanobricks

Temperature-Dependent n-to-p-Type Transition of 2D Mn Oxide Nanosheets toward NO₂ for Flexible Gas Sensor Application