Browsing by Author "Hasan, Md Mehdi"
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Item Open Access Multilayer mXene heterostructures and nanohybrids for multifunctional applications: a review(American Chemical Society, 2022-05-17) Tasnim Mahmud, S.; Bain, S; Hasan, Md Mehdi; Rahman, S.T.; Rhaman, M.; Hossain, M.M.; Ordu, MustafaMXenes (transition metal carbides and nitrides) have experienced exponential growth over the last two decades, thanks to their excellent physical, chemical, and mechanical properties. Intriguing properties like high conductivity, wear, and corrosion resistance while maintaining flexibility are the strong motivation behind the exploration of MXenes. Moreover, the large surface area and unique layered structure enhance the functionality of multilayer-MXene heterostructures and hybrids. This paper reviews the synthesis chemistry, structure properties of multilayer MXenes, and their multifunctional applications. MXene synthesis under different conditions, their hybrids and composites, intercalation, and structural geometries are discussed. The electrical, mechanical, optical, and magnetic properties of MXenes are briefly presented. Recent progress and development in MXene-based heterostructures and nanohybrids for supercapacitors, batteries, environmental and water treatment, antibacterial and tissue engineering, and electromagnetic absorption and shielding are systematically discussed. Finally, research challenges and a perspective in this specified area are addressed for potential developments.Item Open Access Nanomaterials-patterned flexible electrodes for wearable health monitoring: a review(Springer, 2021-06) Hasan, Md Mehdi; Milon Hossain, MdElectrodes fabricated on a flexible substrate are a revolutionary development in wearable health monitoring due to their lightweight, breathability, comfort, and flexibility to conform to the curvilinear body shape. Different metallic thin-film and plastic-based substrates lack comfort for long-term monitoring applications. However, the insulating nature of different polymer, fiber, and textile substrates requires the deposition of conductive materials to render interactive functionality to substrates. Besides, the high porosity and flexibility of fiber and textile substrates pose a great challenge for the homogenous deposition of active materials. Printing is an excellent process to produce a flexible conductive textile electrode for wearable health monitoring applications due to its low cost and scalability. This article critically reviews the current state of the art of different textile architectures as a substrate for the deposition of conductive nanomaterials. Furthermore, recent progress in various printing processes of nanomaterials, challenges of printing nanomaterials on textiles, and their health monitoring applications are described systematically.Item Open Access Scalable fabrication of MXene-PVDF nanocomposite triboelectric fibers via thermal drawing(2022-12) Hasan, Md Mehdi; Sadeque, Md Sazid Bin; Albasar, Ilgın; Pecenek, H.; Dokan, F. K.; Onses, M. Serdar; Ordu, MustafaIn the data-driven world, textile is a valuable resource for improving the quality of life through continuous monitoring of daily activities and physiological signals of humans. Triboelectric nanogenerators (TENG) are an attractive option for self-powered sensor development by coupling energy harvesting and sensing ability. In this study, to the best of the knowledge, scalable fabrication of Ti3C2Tx MXene-embedded polyvinylidene fluoride (PVDF) nanocomposite fiber using a thermal drawing process is presented for the first time. The output open circuit voltage and short circuit current show 53% and 58% improvement, respectively, compared to pristine PVDF fiber. The synergistic interaction between the surface termination groups of MXene and polar PVDF polymer enhances the performance of the fiber. The flexibility of the fiber enables the weaving of fabric TENG devices for large-area applications. The fabric TENG (3 × 2 cm2) demonstrates a power density of 40.8 mW m−2 at the matching load of 8 MΩ by maintaining a stable performance over 12 000 cycles. Moreover, the fabric TENG has shown the capability of energy harvesting by operating a digital clock and a calculator. A distributed self-powered sensor for human activities and walking pattern monitoring are demonstrated with the fabric. © 2022 Wiley-VCH GmbH.Item Embargo Scalable fabrication of nanomaterial integrated polymer fibers as self-powered sensors(2023-12) Hasan, Md MehdiWearable electronics have great potential to revolutionize healthcare by enabling real-time data acquisition and transfer. Textiles, a ubiquitous part of our daily lives, get exposed to a vast amount of biomarkers to provide information on health status and the onset of diseases without compromising comfort. Self-powered sensors have gained interest as these devices do not require any external power to operate but rather can harvest energy to operate the low-power elec-tronics. However, textile-based sensor fabrication requires complex multi-step fabrication protocols. In this study, a one-step fabrication of functional fibers for self-powered sensing using thermal drawing process was investigated. Inte-gration of 2D nanomaterials have significantly improved the performance of the fluoropolymer (PVDF) based triboelectric and piezoelectric fibers. 2D nanoma-terials enhance the output predominantly by the combined effect of interfacial polarization and microcapacitor formation. MXene-PVDF nanocomposite fiber shows β phase increases consistently up to 44% upon 5 wt% MXene addition. The triboelectric fiber demonstrates the capability to harvest energy and biomotion monitoring such as gait analysis. The structural design of MoS2-PVDF piezoelec-tric fiber ensures efficient stress transfer to the piezoelectric domain. Moreover, MoS2 addition increases up to 3 wt% with β phase amount 50% and decreases upon higher MoS2 addition. The Piezoelectric fiber demonstrates the ability to detect physiological signals such as pulse and respiration. The sensors can wirelessly transmit data to store and analyze using a microcontroller unit. The demonstration of large-scale fabrication of the self-powered fiber sensors shows the prospect of the technology as industrially translatable for developing smart clothing.