Browsing by Author "Hasan, Md Mehdi"

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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, Mustafa
MXenes (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.
Open Access
Nanomaterials-patterned flexible electrodes for wearable health monitoring: a review
(Springer, 2021-06) Hasan, Md Mehdi; Milon Hossain, Md
Electrodes 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.
Open Access
Scalable fabrication of MXene-PVDF nanocomposite triboelectric fibers via thermal drawing
(Wiley, 2022-12) Hasan, Md Mehdi; Sadeque, Md Sazid Bin; Albasar, Ilgın; Pecenek, H.; Dokan, F. K.; Onses, M. Serdar; Ordu, Mustafa
In 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.
Embargo
Scalable fabrication of nanomaterial integrated polymer fibers as self-powered sensors
(2023-12) Hasan, Md Mehdi
Wearable 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.
Embargo
Self-poled piezoelectric nanocomposite fiber sensors for wireless monitoring of physiological signals
(American Chemical Society, 2024-06-28) Hasan, Md Mehdi; Rahman, Mahmudur; Sadeque, Md Sazid; Ordu, Mustafa
Self-powered sensors have the potential to enable real-time health monitoring without contributing to the ever-growing demand for energy. Piezoelectric nanogenerators (PENGs) respond to mechanical deformations to produce electrical signals, imparting a sensing capability without external power sources. Textiles conform to the human body and serve as an interactive biomechanical energy harvesting and sensing medium without compromising comfort. However, the textile-based PENG fabrication process is complex and lacks scalability, making these devices impractical for mass production. Here, we demonstrate the fabrication of a long-length PENG fiber compatible with industrial-scale manufacturing. The thermal drawing process enables the one-step fabrication of self-poled MoS2-poly(vinylidene fluoride) (PVDF) nanocomposite fiber devices integrated with electrodes. Heat and stress during thermal drawing and MoS2 nanoparticle addition facilitate interfacial polarization and dielectric modulation to enhance the output performance. The fibers show a 57 and 70% increase in the output voltage and current compared to the pristine PVDF fiber, respectively, at a considerably low MoS2 loading of 3 wt %. The low Young's modulus of the outer cladding ensures an effective stress transfer to the piezocomposite domain and allows minute motion detection. The flexible fibers demonstrate wireless, self-powered physiological sensing and biomotion analysis capability. The study aims to guide the large-scale production of highly sensitive integrated fibers to enable textile-based and plug-and-play wearable sensors.
Open Access
Thermal drawing of MoS₂ integrated PVDF triboelectric fiber for continuous respiration monitoring
(Wiley-VCH Verlag GmbH & Co. KGaA, 2024-12-19) Sadeque, Md Sazid Bin; Rahman, Mahmudur; Hasan, Md Mehdi; Ordu, Mustafa
Triboelectric nanogenerators (TENGs) are environmentally sustainable energy harvesting devices that can convert mechanical and biomechanical energy into electrical output through the synergistic process of triboelectrification and electrostatic induction. Incorporating polyvinylidene fluoride (PVDF) and its copolymers into flexible TENG is particularly advantageous because of the abundance of highly electronegative fluorine ions and high dielectric constant. MoS₂ can interact with PVDF dipoles to improve PVDF's β phase content, thereby improving the triboelectric property of the polymer nanocomposite fibers. In this study, thermally drawn PVDF TENG fibers are fabricated, incorporating various concentrations of $MoS_2$ for the first time. The enhanced β phase property in the nanocomposite fiber improves the triboelectric output where 3 wt.% $MoS_{2-}$ PVDF fiber demonstrates a maximum peak power output of 17.64 µW, exhibiting a threefold increment compared to 0 wt.% $MoS_{2-}$ PVDF fiber. Simultaneous integration of multiple nanomaterials ($MoS_2$ and graphene) is also investigated to analyze the triboelectric fiber's β phase formation and electrical performance. Harnessing the superior sensitivity of the $MoS_2$ integrated triboelectric fiber, a self-powered wearable mask is designed for continuous human respiration monitoring.