Fabrication of a room-temperature NO<sub>2</sub> gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure

Dhariwal, Neeraj; Yadav, Preety; Sanger, Amit; Kang, Sung Bum; Goyat, M. S.; Mishra, Yogendra Kumar; Kumar, Vinod

doi:10.1039/d4ma00168k

Mater. Adv.

2024

DOI: 10.1039/d4ma00168k

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Fabrication of a room-temperature NO₂ gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure

Neeraj Dhariwal,

Preety Yadav,

Amit Sanger

et al.

Abstract: Fabricated a novel rGO/BiOCl heterojunction based NO2 sensor. It shows fast response and recovery of 9 s and 21 s, respectively, at room temperature. It shows a higher response (∼3.78 times) even at lower concentrations of NO2 gas.

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Cited by 5 publications

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Bi2WO6 gas sensors for low concentration CO sensing: Experimental and computational studies

Aranthady,

Mishra,

Gupta

et al. 2025

Materials Science and Engineering: B

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Bi2WO6 gas sensors for low concentration CO sensing: Experimental and computational studies

Aranthady,

Mishra,

Gupta

et al. 2025

Materials Science and Engineering: B

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Next-Generation BiOCl/MXene Nanocomposites: Optimized for Dye Removal and Supercapacitor Applications

Mehlawat,

Panda,

Dhariwal

et al. 2024

Langmuir

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The study focuses on the development of an efficient and sustainable solution for synthetic dye degradation through the hydrothermal synthesis of BiOCl and BiOCl/MXene heterostructures. Structural and compositional properties were analyzed by using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), and X-ray photoelectron spectroscopy (XPS) techniques. A significant reduction in the band gap of BiOCl/MXene to 2.97 eV from 3.62 eV for BiOCl was observed via UV spectroscopy, leading to enhanced photocatalysis with 89% degradation efficiency in just 12 min. The mechanism involved and reactive species were confirmed by LC-HRMS and radical trapping tests, while ICP-MS verified metal content in water before and after degradation. Additionally, the nanocomposite demonstrated a specific capacitance of 431.24 F g −1 at a current density of 1 mA cm −2 , with an excellent capacitance retention of 94.35% after 2000 cycles. This study highlights BiOCl/MXene as a promising material for both photodegradation and supercapacitor applications.

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Enhanced Photocatalytic Degradation of Environmental Pollutants Using a Triphenylamine-Based Polymer: Synthesis, Characterization, and Mechanistic Insights

Pritee,

Dhariwal,

Yadav

et al. 2024

Langmuir

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Conjugated porous organic polymers have sparked growing research attention as photocatalysts owing to their high surface area, tunable pores, and capacity to collect and transfer light energy via their delocalized backbone. However, the synthesis methods for preparing these polymers require difficult experimental setups, such as high polymerization temperature, inert atmosphere, and use of transition metal catalysts. In the present work, a triphenylamine-based conjugated porous polymer (TPA− BPA) has been synthesized employing tris(4-aminophenyl)amine (TPA) and biphenyldicarboxaldehyde (BPA) as precursors via a one-pot Schiff base reaction in ambient conditions in the absence of the metal catalyst. The synthesized TPA−BPA polymer has been characterized using Fourier transform infrared spectroscopy, 13 C cross-polarization magic angle spinning nuclear magnetic resonance, Brunauer−Emmett−Teller (BET), thermogravimetric analysis, field emission scanning electron microscopy, highresolution transmission electron microscopy, valence band X-ray photoelectron spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, powder X-ray diffraction, electron paramagnetic resonance (EPR), and diffuse reflectance spectroscopy (DRS) techniques. The DRS analysis revealed that TPA−BPA has an optical band gap of 2.1 eV, demonstrating its semiconductive nature. The EPR study has shown that the synthesized polymer exhibits an intense radical signal at g = 2.00, confirming free radical generation upon photoexcitation and facilitating the breakdown of organic contaminants by photocatalysis. TPA−BPA possesses an exceptional porous structure with a surface area of 36 m 2 /g, as confirmed by BET studies, and high thermal stability up to 420 °C. It has been confirmed by photocatalytic studies that TPA−BPA shows effective degradation of methyl orange (92%), Congo red (91.5%), tobramycin (96%), and hydroquinone (85%) under visible light irradiation in 60 min. Owing to these observations, TPA− BPA can be an excellent candidate as a photocatalyst for environmental remediation. These findings pave the way for large-scale manufacturing of metal-free conjugated porous polymers as photocatalysts with variable photoelectrical characteristics.

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Fabrication of a room-temperature NO₂ gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure

Abstract: Fabricated a novel rGO/BiOCl heterojunction based NO2 sensor. It shows fast response and recovery of 9 s and 21 s, respectively, at room temperature. It shows a higher response (∼3.78 times) even at lower concentrations of NO2 gas.

Cited by 5 publications

References 83 publications

Bi2WO6 gas sensors for low concentration CO sensing: Experimental and computational studies

Bi2WO6 gas sensors for low concentration CO sensing: Experimental and computational studies

Next-Generation BiOCl/MXene Nanocomposites: Optimized for Dye Removal and Supercapacitor Applications

Enhanced Photocatalytic Degradation of Environmental Pollutants Using a Triphenylamine-Based Polymer: Synthesis, Characterization, and Mechanistic Insights

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Fabrication of a room-temperature NO2 gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure

Abstract: Fabricated a novel rGO/BiOCl heterojunction based NO2 sensor. It shows fast response and recovery of 9 s and 21 s, respectively, at room temperature. It shows a higher response (∼3.78 times) even at lower concentrations of NO2 gas.

Cited by 5 publications

References 83 publications

Bi2WO6 gas sensors for low concentration CO sensing: Experimental and computational studies

Bi2WO6 gas sensors for low concentration CO sensing: Experimental and computational studies

Next-Generation BiOCl/MXene Nanocomposites: Optimized for Dye Removal and Supercapacitor Applications

Enhanced Photocatalytic Degradation of Environmental Pollutants Using a Triphenylamine-Based Polymer: Synthesis, Characterization, and Mechanistic Insights

Contact Info

Product

Resources

About

Fabrication of a room-temperature NO₂ gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure