자가 구동 스마트 농업 IoT 응용을 위한 회전형 하이브리드 나노발전기

Toyabur Rahman,이상현(Sang Hyun Lee),박재영(Jae Yeong Park) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7

Natural wind-driven ultra-compact and highly efficient hybridized nanogenerator for self-sustained wireless environmental monitoring system

Rahman, M. Toyabur,Salauddin, Md,Maharjan, P.,Rasel, M.S.,Cho, Hyunok,Park, Jae Yeong Elsevier 2019 Nano energy Vol.57 No.-

<P><B>Abstract</B></P> <P>Owing to the climate change and energy crisis, harvesting energy from our surroundings and the construction of self-powered wireless environmental monitoring systems are promising approaches in modern times. In this paper, an ultra-compact highly efficient miniaturized windmill comprising a hybridized nanogenerator (MW-HNG) is reported based on three conversion mechanisms <I>i.e.</I> triboelectric nanogenerator (TENG), piezoelectric nanogenerator (PENG), and electromagnetic generator (EMG). The MW-HNG is designed as a 3D-printed fully-enclosed structure for the natural wind energy harvesting by converting into rotational motion: all harvesting units reside in a common rotation system to effectively and simultaneously produce electricity. At a wind speed of 6 m/s, the flexible-blade-based hybridization-mode (contact–lateral sliding–separation–contact) TENG and coupled PENG can generate maximal power values of 1.67 mW and 1.38 mW at optimal load resistances of 10 MΩ and 330 KΩ, respectively. In contrast, the multipole-magnet-based EMG can obtain a maximal output power of 268.6 mW at 180 Ω. The MW-HNG demonstrates a quick charging ability for capacitors and the capability to feed hundreds of LEDs. Further, a self-powered wireless sensor system is developed for real-time environmental monitoring by combining an MW-HNG, a customized power management circuit, and wireless sensor unit (a smartphone to display sensor data). Our proposed MW-HNG is suitable for self-powered wireless sensor networks (WSNs) in the subway system by generating high-power electrical output from moving-induced wind mechanical energy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3D-printed fully-enclosed hybridized nanogenerator for wind energy harvesting. </LI> <LI> Integrated three popular conversion mechanisms into a single energy harvesting unit. </LI> <LI> Flexible-blade-based hybridizing TENG, coupled PENG and multipole-magnet-based EMG. </LI> <LI> Potential application in subway system for illuminating billboard and animated LEDs. </LI> <LI> Self-powered wireless environmental sensor with real-time monitoring <I>via</I> smartphone. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

A human locomotion inspired hybrid nanogenerator for wrist-wearable electronic device and sensor applications

Maharjan, P.,Toyabur, R.M.,Park, J.Y. Elsevier 2018 Nano energy Vol.46 No.-

<P><B>Abstract</B></P> <P>The availability of realistic, wearable efficient energy harvesters for powering body-worn IoT devices and health monitoring sensors is essential, in order to reduce the dependence of these wearable electronic devices, on batteries. Herein, we demonstrate a novel curve-shaped wearable hybridized electromagnetic-triboelectric nanogenerator (WHEM-TENG), operating as a fully-enclosed light-weight low-frequency energy harvester, driven by human motion. The WHEM-TENG incorporates the swinging behavior of a human arm during locomotion, and the freestanding rolling mode of a magnetic ball. Simulations of the magnetic flux density and the triboelectric surface potential assisted in improving the design and performance of the nanogenerator. The harvester device was manufactured using a 3D-printing method, which makes the fabrication process faster, easier, and more cost-effective than traditional methods. The 3D-printing material was used as triboelectric material for the nanogenerator. Experiments illustrate that at the low input frequencies characteristic of walking and running, the electromagnetic generator (EMG) and triboelectric nanogenerator (TENG) deliver peak power densities of 5.14 mW/cm<SUP>3</SUP> and 0.22 µW/cm<SUP>3</SUP>, across load resistances of 49.2 Ω and 13.9 MΩ, respectively. Moreover, we also demonstrate that the WHEM-TENG can drive a commercially available electric wrist-watch continuously for 410 s from the power generated by just 5 s of running activity. Also, we demonstrate a self-powered heart-rate sensor driven by the nanogenerator. The electrical output of this distinctively structured device is promising for optimization of similar hybrid wearable energy harvesters, and for practical applications, towards the development of self-powered wearable smart bands/watches and fitness/health monitoring sensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Human locomotion inspired novel curve-shape design is introduced as nanogenerator. </LI> <LI> Low frequency driven, light weight, fully enclosed and wrist-wearable generator. </LI> <LI> The 3d-printing method and material were used for fabrication of the nanogenerator. </LI> <LI> Converting human arm-motion energy into electrical energy to power wearable devices. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Miniaturized springless hybrid nanogenerator for powering portable and wearable electronic devices from human-body-induced vibration

Salauddin, Md,Toyabur, R.M.,Maharjan, P.,Rasel, M.S.,Kim, J.W.,Cho, Hyunok,Park, Jae Yeong Elsevier 2018 Nano energy Vol.51 No.-

<P><B>Abstract</B></P> <P>In this paper, a springless hybridized NG (nanogenerator) was newly designed to have a non-resonant behavior, in which the output power continuously increases with the input frequency and amplitude. To achieve a considerably higher output power generation at low-frequency vibrations and low amplitude, the proposed springless hybrid electromagnetic and triboelectric nanogenerator (SHEMG-TENG) utilizes a dual-Halbach array, which is fabricated with contact-separation and sliding-mode TENGs. The proposed SHEMG-TENG is fabricated and verified from a vibration exciter and human-body-induced vibration. Under the vibration exciter test (horizontal position), the fabricated SHEMG-TENG generated an output current and power of 2.04 mA and 5.41 mW, respectively, which corresponds to a volume power density of 395.4 W/m<SUP>3</SUP> under a matching load resistance of 1.1 KΩ at an applied frequency and acceleration of 6 Hz and 1 g, respectively. For a number of basic human activities such as handshaking, walking, and slow running, the SHEMG-TENG was able to deliver output powers are 2.9 mW, 1.2 mW, and 1.7 mW (horizontal position), respectively, and 1.6 mW, 0.74 mW, and 2.3 mW (vertical position), respectively. This work presents an important step toward realizing SHEMG-TENG from human-body-induced vibration powered to enable wearable and portable smart electronic applications, and is expected to be widely accepted by the general public in their daily lifestyle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New design and modeling of springless hybrid nanogenerator. </LI> <LI> EMG, contact-separation and sliding mode of TENG. </LI> <LI> Dual Halbach magnet array, nano structured of PTFE, Al grass, and Al porous. </LI> <LI> Higher output-power generation in non-resonant and low-frequency operation. </LI> <LI> Powered wearable and portable electronic devices. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Effect of Normal Load on Friction of MXene Films

Prashant Pendyala,Muhammad Toyabur Rahman,Seon Joon Kim,Eui-Sung Yoon 한국트라이볼로지학회 2021 한국트라이볼로지학회 학술대회 Vol.2021 No.10

An impedance tunable and highly efficient triboelectric nanogenerator for large-scale, ultra-sensitive pressure sensing applications

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>