7 results on '"Almehbad, Noura"'
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2. Unveiling the potential of PANI@MnO2@rGO ternary nanocomposite in energy storage and gas sensing
- Author
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Umar, Ahmad, primary, Akbar, Sheikh, additional, Kumar, Rajesh, additional, Ahmed, Faheem, additional, Ansari, Sajid Ali, additional, Ibrahim, Ahmed A., additional, Alhamami, Mohsen A., additional, Almehbad, Noura, additional, Algadi, Hassan, additional, Almas, Tubia, additional, and Zeng, Wen, additional
- Published
- 2023
- Full Text
- View/download PDF
3. Hydrothermally grown ZnO nanoflowers for environmental remediation and clean energy applications
- Author
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Umar, Ahmad, primary, Akhtar, M.S., additional, Al-Hajry, A., additional, Al-Assiri, M.S., additional, and Almehbad, Noura Y., additional
- Published
- 2012
- Full Text
- View/download PDF
4. Porous Mn2O3nanorods-based electrode for high-performance electrochemical supercapacitor
- Author
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Umar, Ahmad, Jung, Insung, Ibrahim, Ahmed A., Akhtar, M. Shaheer, Kumar, Sundararajan Ashok, Alhamami, Mohsen A.M., Almas, Tubia, Almehbad, Noura, and Baskoutas, Sotirios
- Abstract
In this research, we introduce an effective electrode material, i.e. porous manganese oxide (Mn2O3) nanorods (NRs) prepared by simple hydrothermal process, designed for use in electrochemical supercapacitors. XRD analysis unequivocally confirms that the Mn2O3NRs possess a pure cubic crystalline structure with an Ia3space group, indicating the high degree of crystallinity and phase purity. Morphological examinations confirmed that the Mn2O3NRs display a distinct rod-like structure, featuring an average size of around 30 nm, underscoring their nanostructured characteristics. The electrochemical performance of the synthesized Mn2O3NRs as electrodes for supercapacitors was thoroughly examined, resulting in an impressive specific capacitance of 483 F/g at a scan rate of 10 mV/s. Electrochemical impedance spectroscopy (EIS) analysis was carried out to assess the effective series resistance (ESR), revealing a minimal resistance value of 3.2 Ω, highlighting excellent charge transfer kinetics. Mn2O3NRs electrode displayed exceptional capacitance retention even after undergoing 500 charge–discharge cycles at a high current density of 5 A/g, indicating their remarkable chemical stability as an electrode material. This study introduces a promising and scalable approach for the development of high-performance supercapacitors, with Mn2O3NRs as a critical component, and offers valuable insights into the design and engineering of advanced energy storage devices.
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- 2024
- Full Text
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5. Synthesis of Bitter gourd-shaped Cu-doped ZnO nanostructures and their investigation for the detection of NO2 gas at low concentrations.
- Author
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Umar, Ahmad, Ibrahim, Ahmed A., Begi, Amensisa Negasa, Alhamami, Mohsen A.M., Almehbad, Noura, Hussain, Shahid, and Akbar, Sheikh
- Subjects
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ZINC oxide , *SCANNING electron microscopes , *GAS detectors , *NANOSTRUCTURES , *MOMORDICA charantia , *NITROGEN dioxide - Abstract
Nitrogen dioxide (NO 2) exposure can have several adverse health impacts on people, especially the respiratory system. Low selectivity, a lack of long-term stability, and structural and morphological optimization are some challenges associated with using ZnO for NO 2 gas sensing. Therefore, we intended copper (Cu) doping in ZnO to alter its shape and gas-sensing characteristics. This study explores the synthesis, properties, and gas-sensing capabilities of bitter gourd-shaped Cu-doped zinc oxide (ZnO) nanostructures for the detection of nitrogen dioxide (NO 2). A facile hydrothermal synthesis method was employed to synthesize bitter gourd-shaped Cu-doped ZnO nanostructures and comprehensively characterized by several techniques. Comprehensive characterizations of our produced Cu-doped ZnO nanomaterial demonstrated by X-ray diffraction (XRD), Scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDS), and different energy spectrum. The material was annealed at 400 °C in a controlled dry air environment to improve its suitability for gas sensor applications. A series of temperature-ranging experiments were conducted to get gas-sensing readings from 25 °C to 300 °C. The resulting sensor, founded upon the distinctive morphology of Cu-doped ZnO structures reminiscent of the intricate shape of bitter gourd, unveiled good selectivity with a pronounced affinity for detecting NO 2 gas. Notably, the zenith of its performance was attained at an operating temperature of 200 °C, where its selectivity and sensitivity were most pronounced. Even at a low concentration of 1 ppm, the sensors displayed a maximum response of 3.7, highlighting their high sensitivity. The sensors demonstrated excellent reproducibility, selectivity, and a low detection limit. These findings position bitter gourd-shaped Cu-doped ZnO nanostructures as promising candidates for NO 2 sensing applications across diverse environments. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
6. Ce-doped ZnO nanostructures: A promising platform for NO2 gas sensing.
- Author
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Umar, Ahmad, Akbar, Sheikh, Kumar, Rajesh, Amu-Darko, Jesse Nii Okai, Hussain, Shahid, Ibrahim, Ahmed A., Alhamami, Mohsen A., Almehbad, Noura, Almas, Tubia, and Seliem, Amal F.
- Subjects
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OFFSHORE gas well drilling , *BAND gaps , *ACETONE , *GAS detectors , *NANOSTRUCTURES , *ZINC oxide , *ENVIRONMENTAL monitoring , *YTTRIUM aluminum garnet - Abstract
In this comprehensive study, Ce-doped ZnO nanostructures were hydrothermally synthesized with varying Ce concentrations (0.5%, 1.0%, 1.5%, and 2.0%) to explore their gas-sensing capabilities, particularly towards NO 2. Structural characterization revealed that as Ce doping increased, crystal size exhibited a slight increment while band gap energies decreased. Notably, the 0.5% Ce-doped ZnO nanostructure demonstrated the highest NO 2 gas response of 8.6, underscoring the significance of a delicate balance between crystal size and band gap energy for optimal sensing performance. The selectivity of the 0.5% Ce-doped ZnO nanostructures to NO 2 over other gases like H 2 , acetone, NH 3 , and CO at a concentration of 100 ppm and an optimized temperature of 250 °C was exceptional, highlighting its discriminatory prowess even in the presence of potential interfering gases. Furthermore, the sensor displayed reliability and reversibility during five consecutive tests, showcasing consistent performance. Long-term stability testing over 30 days revealed that the gas response remained almost constant, indicating the sensor's remarkable durability. In addition to its robustness against humidity variations, maintaining effectiveness even at 41% humidity, the sensor exhibited impressive response and recovery times. While the response time was swift at 11.8 s, the recovery time was slightly prolonged at 56.3 s due to the strong adsorption of NO 2 molecules onto the sensing material hindering the desorption process. The study revealed the intricate connection between Ce-doping levels, structure, and gas-sensing. It highlighted the 0.5% Ce-doped ZnO nanostructure as a highly selective, reliable, and durable NO 2 gas sensor, with implications for future environmental monitoring and safety. [Display omitted] • Pure ZnO and Ce-doped ZnO nanostructures were hydrothermally synthesized and characterized. • 0.5% Ce-doped ZnO demonstrated superior NO 2 gas response, emphasizing critical doping levels for optimal sensing. • High gas response of 8.6–100 ppm NO 2 at optimal temperature of 250 °C with fast response and recovery times. • Consistent performance over five tests and stability over 30 days highlighted the gas sensor's reliability. • Robust against humidity, effective at 41%, emphasizing practical applicability. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. Unveiling the potential of PANI@MnO2@rGO ternary nanocomposite in energy storage and gas sensing.
- Author
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Umar, Ahmad, Akbar, Sheikh, Kumar, Rajesh, Ahmed, Faheem, Ansari, Sajid Ali, Ibrahim, Ahmed A., Alhamami, Mohsen A., Almehbad, Noura, Algadi, Hassan, Almas, Tubia, and Zeng, Wen
- Subjects
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SUPERCAPACITOR electrodes , *ENERGY storage , *GAS detectors , *GAS storage , *NANOCOMPOSITE materials , *HYDROTHERMAL synthesis - Abstract
The development of advanced materials for energy storage and gas sensing applications has gained significant attention in recent years. In this study, we synthesized and characterized PANI@MnO 2 @rGO ternary nanocomposites (NCs) to explore their potential in supercapacitors and gas sensing devices. The ternary NCs were synthesized through a multi-step process involving the hydrothermal synthesis of MnO 2 nanoparticles, preparation of PANI@rGO composites and the assembly to the ternary PANI@MnO 2 @rGO ternary NCs. The structural, morphological, and compositional characteristics of the materials were thoroughly analyzed using techniques such as XRD, FESEM, TEM, FTIR, and Raman spectroscopy. In the realm of gas sensing, the ternary NCs exhibited excellent performance as NH 3 gas sensors. The optimized operating temperature of 100 °C yielded a peak response of 15.56 towards 50 ppm NH 3. The nanocomposites demonstrated fast response and recovery times of 6 s and 10 s, respectively, and displayed remarkable selectivity for NH 3 gas over other tested gases. For supercapacitor applications, the electrochemical performance of the ternary NCs was evaluated using cyclic voltammetry and galvanostatic charge-discharge techniques. The composites exhibited pseudocapacitive behavior, with the capacitance reaching up to 185 F/g at 1 A/g and excellent capacitance retention of approximately 88.54% over 4000 charge-discharge cycles. The unique combination of rGO, PANI, and MnO 2 nanoparticles in these ternary NCs offer synergistic advantages, showcasing their potential to address challenges in energy storage and gas sensing technologies. Proposed NH 3 gas sensing mechanism for PANI@MnO 2 @rGO ternary nanocomposite based sensor. [Display omitted] • Synthesized PANI@MnO 2 @rGO NCs in multistep process. • Confirmed successful component integration with characterization techniques. • Explored NCs for supercapacitors and gas sensing applications. • Achieved gas response of 15.56 for 50 ppm NH 3 gas at optimized temperature. • Observed C sp of 185 F/g at 1 A/g with 88.54% retention over 4000 cycles. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
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