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RISS 인기검색어
- 검색키워드
- 저자 : Pukar Maharjan (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Maharjan, Pukar,Cho, Hyunok,Rasel, M. Salauddin,Salauddin, Md.,Park, Jae Yeong Elsevier 2018 Nano energy Vol.53 No.-
<P><B>Abstract</B></P> <P>Human body motion is highly regarded as a promising source of energy for powering body-worn electronic devices and health monitoring sensors. Transforming the human biomechanical energy into an electrical energy provides a sustainable energy to drive those devices and sensors, reducing their battery dependency. This work presents a fully-enclosed wrist-wearable hybridized electromagnetic-triboelectric nanogenerator (FEHN) for effectively scavenging energy from the low-frequency natural human wrist-motion (≤ 5 Hz). The FEHN incorporates the rolling electrostatic induction and electromagnetic induction using a freely moving magnetic ball inside a hollow circular tube. The materials used in 3D printing technology are used as energy harvesting material for easy, quick and worthwhile fabrication of the FEHN. A thin flexible flux concentrating material is introduced to increase the emf and enhances the electromagnetic output performance. The FEHN can harvest energy under the diverse circumstances and irregular wrist-motions, such as swinging, waving, shaking, etc. Following the experiments, the FEHN achieves an average power density of 0.118 mW cm<SUP>−3</SUP> and can drive a commercial wrist-watch continuously for more than 23 min from just 5 s of wrist motion. This successful demonstration renders an effective approach for scavenging wasted biomechanical energy and provides a promising solution towards the development of sustainable power supply for wearable electronic devices and self-powered healthcare monitoring sensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A fully enclosed, 3D printed and hybridized nanogenerator, isolated from external environment is newly developed </LI> <LI> Sustainable nanogenerator for powering body-worn wearable electronic devices and healthcare monitoring sensors. </LI> <LI> Highly capable of harvesting energy from diverse wrist motions such as swinging, waving, shaking, twisting, etc. </LI> <LI> A flexible FeSiCr/PDMS composite based flux concentrator around the copper coil is applied to increase the induced emf. </LI> <LI> 5 s of wrist motion is enough to power a commercial electronic wrist-watch for more than 23 min continuously. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Rasel, M. Salauddin,Maharjan, Pukar,Park, Jae Yeong Elsevier 2019 Nano energy Vol.63 No.-
<P><B>Abstract</B></P> <P>We report a human skin-based wearable and hybrid triboelectric-piezoelectric nanogenerator (HTEPENG) for harvesting biomechanical energy from hand clapping to eliminate the need for batteries to drive portable electronic devices. Through smart integration of polyimide encapsulated polarized polyvinylidene fluoride (PVDF) film between two nanopillar polydimethylsiloxane (n-PDMS) films, the hybrid nanogenerator can produce two triboelectric outputs and one piezoelectric output simultaneously upon a single clap. The output performances of the HTEPENG have been optimized through systematic analysis and experimental validation of the surface morphology and coupling effect of interfacing materials. The as-fabricated HTEPENG device delivers a peak power density of 3.7 W/m<SUP>2</SUP> at a matched resistance of 23.08 MΩ. After the use of a custom-designed power conversion and management system (PCMS), the nanogenerator was able to drive a commercial pedometer and successfully recharged a trimmer, pocket Wi-Fi router, and smartphone individually, which might speed up commercialization of the wearable nanogenerators. Furthermore, the HTEPENG possesses a unique characteristic of modulated multi-level outputs, which has the potential to bring extensive application prospects in the field of logic devices, power supply, prosthetics, antistatic protection, and self-powered sensor networks. Even though clapping is a natural human activity to applaud somebody which is very common in many environments like a concert, theatre, and stadium, it is also well known to improve the overall human health by improving the blood circulation to various organs. Thereby, other than serving as a universal power source, the proposed hybrid nanogenerator can promote additional health benefit for the human.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hand clapping inspired biomechanical energy harvesting from skin-contact is reported. </LI> <LI> Charge compensation problem of conventional multilayer nanogenerators is solved. </LI> <LI> The concept of multi-level outputs of the nanogenerator is newly established. </LI> <LI> The output performance of the hybrid nanogenerator is optimized systematically. </LI> <LI> A power management circuit is introduced for powering portable electronics. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Rasel, M. Salauddin,Maharjan, Pukar,Salauddin, Md.,Rahman, M. Toyabur,Cho, Hyun Ok,Kim, Jae Woo,Park, Jae Yeong Elsevier 2018 Nano energy Vol.49 No.-
<P><B>Abstract</B></P> <P>Precise triboelectric nanogenerators (TENGs) with large-scale pressure sensing ability can be realized by effectively harvesting physical pressure. Extensive research on efficient pressure sensors is ongoing, yet the pressure detection limit and sensitivity of most of the reported pressure sensors are not satisfactory for practical and wearable device applications. Herein, we demonstrate a highly efficient approach toward detecting a wide range of pressures, from 5 kPa to 450 kPa, with a record high sensitivity of 0.51 V/kPa. We aim at maximizing the energy conversion efficiency of 48.17% by optimally tuning the internal impedance of the triboelectric nanogenerator at 2.5 MΩ, because low internal impedance results in high output power. This paper reports the structural design, fabrication, and experimental validation of a self-powered and highly durable TENG pressure sensor for large-scale pressure detection based on double-side tribological layers of micro-patterned polydimethylsiloxane (PDMS) and PDMS-multiwall carbon nanotube (CNT) nanocomposites. An in-sole application of the proposed TENG is demonstrated for varying foot pressures corresponding to different walking patterns, which is likely to be applicable in sports sciences, high-risk diabetic foot ulceration, and rehabilitation. Our present contribution not only facilitates large-scale pressure sensing but also paves the way toward the realization of next-generation self-powered and maintenance-free sensing devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A self-powered triboelectric nanogenerator with record high pressure detection range (From 5 kPa to 450 kPa). </LI> <LI> A maximum of 0.51 V/kPa sensitivity. </LI> <LI> Up to 48.17% energy conversion efficiency. </LI> <LI> Low internal impedance of 2.5 MΩ. </LI> <LI> In-sole application. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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