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A Knitted Sensing Glove for human Hand Postures Pattern Recognition

SENSORS 2021年第4期21卷 1364-1364页

作者： Lee, Seulah Choi, Yuna Sung, Minchang Bae, Jihyun Choi, Youngjin Hanyang Univ Dept Elect & Elect Engn Ansan 15588 South Korea Hanyang Univ Dept Clothing & Text Human Tech Convergence Program Seoul 04763 South Korea

In recent years, flexible sensors for data gloves have been developed that aim to achieve excellent wearability, but they are associated with difficulties due to the complicated manufacturing and embedding into the glove. This study proposes a knitted glove integrated with strain sensors for pattern recognition of hand postures. The proposed sensing glove is fabricated at all once by a knitting technique without sewing and bonding, which is composed of strain sensors knitted with conductive yarn and a glove body with non-conductive yarn. To verify the performance of the developed glove, electrical resistance variations were measured according to the flexed angle and speed. These data showed different values depending on the speed or angle of movements. We carried out experiments on hand postures pattern recognition for the practicability verification of the knitted sensing glove. For this purpose, 10 able-bodied subjects participated in the recognition experiments on 10 target hand postures. The average classification accuracy of 10 subjects reached 94.17% when their own data were used. The accuracy of up to 97.1% was achieved in the case of grasp posture among 10 target postures. When all mixed data from 10 subjects were utilized for pattern recognition, the average classification expressed by the confusion matrix arrived at 89.5%. Therefore, the comprehensive experimental results demonstrated the effectiveness of the knitted sensing gloves. In addition, it is expected to reduce the cost through a simple manufacturing process of the knitted sensing glove.

关键词： knitted sensor wearable strain sensor data glove fabric sensor pattern recognition

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Eco-Friendly Hybrid Composite Fillers for High-Performance Epoxy Insulators: Advancing Thermal and Electrical Durability

ACS APPLIED ENGINEERING MATERIALS

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ACS APPLIED ENGINEERING MATERIALS 2025年第4期3卷 938-946页

作者： Kim, Young Nam Jeong, Hyunsung Yoon, Somi Choi, Yong-Seok Shim, Jae Hun Zha, Jun-Wei Wie, Jeong Jae Kim, Jung Kyu Jung, Yong Chae Korea Inst Sci & Technol KIST RAMP Convergence Res Ctr Jeonbuk 55324 Wanju Gun South Korea Sungkyunkwan Univ SKKU Sch Chem Engn Suwon 16419 South Korea Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Kukdo Chem Co Seoul 08558 South Korea North China Elect Power Univ Sch Elect & Elect Engn State Key Lab Alternate Elect Power Syst Renewable Beijing 102206 Peoples R China Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea SUNY Coll Environm Sci & Forestry Dept Chem Engn Syracuse NY 13210 USA

The increasing demand for high power due to urbanization requires a stable supply of electrical energy and the development of insulating composites with high heat resistance and insulating properties. Epoxy is a typical insulating polymer used in various industries, especially as a resin for gas-insulated switchgear (GIS) spacers. In this study, a hybrid fusion microfillers (HMFFs) with a core-shell structure were synthesized by the mechano-fusion method with zinc oxide (ZnO) and alumina (Al2O3) fillers to improve the mechanical strength and dielectric strength of epoxy. By combining heterogeneous particles into a single particle, HMFFs developed a structure of insulating particles with improved heat resistance and insulating properties. The epoxy insulating composite with HMFFs induced the dispersion of energy flow, which improved the durability of the resin, as well as the mechanical strength and dielectric strength. In addition, the insulation composite with stable tensile and flexural strength properties even at high temperatures of 80 degrees C suggests that it can be used as the main insulating composite for GIS to ensure stable transmission of high-current electric energy.

关键词： dry particle coating insulation heat resistant epoxy gas insulated switchgear

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Nickel Oxide for Perovskite Photovoltaic Cells

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ADVANCED PHOTONICS RESEARCH 2021年第8期2卷

作者： Park, Hansol Chaurasiya, Rajneesh Jeong, Bum Ho Sakthivel, Perumal Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea

Organic-inorganic perovskite solar cells (PSCs) have shown tremendous progress from 3.8% power conversion efficiency (PCE) in 2003 to 25.2% in 2020 because of their wide range of light absorption, fast charge separation, long carrier diffusion length, and long carrier lifetime. The optoelectronic characteristics of hole transport material (HTM) and electron transport material (ETM) strongly affect photovoltaic (PV) performance and stability of PSCs. Recently, various inorganic HTMs with high efficiency, stability, and cost-effectiveness have been investigated. Among them, nickel oxide (NiOx) is one of the most studied inorganic HTMs in terms of device performance and stability because it has high hole mobility, electrical conductivity, transmittance, and energetically favorable band alignment, along with environmental stability. This article overviews the recent progress on NiOx-based planar PSCs. The main focus is on the structural, electrical and optical properties of the NiOx thin film, which mainly depends on the synthesis methods and post-treatments. Firstly, a variety of methods are investigated to fabricate dense, compact and high crystallized NiOx thin film. Moreover, multifarious doping strategies and surface functionalization using organic materials are summarized as approaches to improve their properties for realizing high performance p-i-n planar PSC devices.

关键词： hole transport materials inorganic materials nickel oxide perovskite solar cells processing methods

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Functional group effect of chemically modified microcrystalline methyl cellulose on thermoplastic polyurethane composites

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CELLULOSE 2023年第11期30卷 6917-6931页

作者： Jhang, Saebohm Cho, Woongbi Lee, Seo Ku Yu, Ah Ran Lee, Jae Gyeong Jung, Kyungho Pu, Yunqiao Yoo, Chang Geun Wie, Jeong Jae Inha Univ Program Environm & Polymer Engn Incheon 22212 South Korea Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea SUNY Coll Environm Sci & Forestry Dept Chem Engn Syracuse NY 13210 USA Inha Univ Dept Polymer Sci & Engn Incheon 22212 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea LG Elect Inc Mat & Devices Adv Res Inst Adv Mat Team Bldg W1LG Sci Pk10Magokjungang 10 Ro Seoul 07796 South Korea Oak Ridge Natl Lab Joint Inst Biol Sci Biosci Div Oak Ridge TN 37831 USA Michael M Szwarc Polymer Res Inst Syracuse NY 13210 USA Hanyang Univ Dept Chem Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimni Ro Seoul 04763 South Korea

Microcrystalline cellulose (MCC) is a promising bio-based filler for lightweight yet mechanically high-performance eco-polymer composites because of its low density and high biocompatibility. However, intermolecular hydrogen bonding among MCC is stronger than the polymer-filler interactions, which deteriorate the mechanical properties of the composites. Herein, we investigated the effects of functional groups on the mechanical properties of composites by scrutinizing chemically modified microcrystalline methyl cellulose (m-MMC) with three different substitution levels of hydroxyl group to hydroxypropyl (HP) group: no-, low-, and high-level substitution (HP-0, HP-low, and HP-high). The degree of HP substitution of m-MMC was quantitatively measured by CP/MAS NMR analysis. The relatively bulky HP groups interrupted the filler-filler intermolecular interactions and reduced the crystallinity and density of m-MMC, as evident from X-ray diffractometer and pycnometer data, respectively. For scalable production of the composites, the m-MMC were compounded with thermoplastic polyurethane (TPU) by a twin-screw extruder

关键词： Thermoplastic polyurethane Microcrystalline cellulose Composites Mechanical properties Structure-property relationships

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Enhancement of thermomechanical properties of sulfur-rich polymers by post-thermal treatment

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POLYMER CHEMISTRY 2023年第8期14卷 943-951页

作者： Han, Nara Cho, Woongbi Hwang, Jae Hyuk Won, Sukyoung Kim, Dong-Gyun Wie, Jeong Jae Inha Univ Program Environm & Polymer Engn 100 Inha Ro Incheon 22212 South Korea SUNY Coll Environm Sci & Forestry Dept Chem Engn Syracuse NY 13210 USA Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Korea Res Inst Chem Technol Adv Mat Div 141 Gajeong Ro Daejeon 34114 South Korea Hanyang Univ Res Inst Ind Sci 222 Wangsimni Ro Seoul 04763 South Korea Univ Sci & Technol Adv Mat & Chem Engn 217 Gajeong Ro Daejeon 34114 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimmni Ro Seoul 04763 South Korea Hanyang Univ Dept Chem Engn 222 Wangsimmni Ro Seoul 04763 South Korea SUNY Coll Environm Sci & Forestry Michael M Szwarc Polymer Res Inst Syracuse NY 13210 USA

Recently, sulfur-rich polymers have been applied in various fields including energy storage, mercury removal, and infrared (IR) optics. However, sulfur-rich polymers typically exhibit insufficient thermomechanical properties for practical applications. Herein, we systematically investigate the effects of thermal treatment on the thermomechanical properties, represented by the glass transition temperature (T-g) and storage modulus, of sulfur-rich polymers prepared by inverse vulcanization with 70 wt% elemental sulfur (S) and 30 wt% divinylbenzene (DVB). The thermal treatment was conducted at three different temperatures (110, 140, and 170 degrees C) for six different times (1, 2, 6, 12, 24, and 48 h). During the thermal treatment, the thermomechanical properties of poly(sulfur(70)-random-DVB30) [poly(S-70-r-DVB30)] increased owing to the thermal degradation of small molecules, including sulfur oligomers and thermally degraded DVB, which acts as a plasticizer. However, excessive thermal treatment induced a deterioration in thermomechanical properties owing to thermal degradation. By systematic investigation of the thermal treatment, the storage modulus of poly(S-70-r-DVB30) could increase from 3 GPa to 4 GPa.

关键词： Heat treatment

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High Open-Circuit Voltage Wide-Bandgap Perovskite Solar Cell with Interface Dipole Layer

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SMALL 2024年第50期20卷 e2404784页

作者： Heo, Jihyeon Prayogo, Juan Anthony Lee, Seok Woo Park, Hansol Muthu, Senthilkumar Hong, JeeHee Kim, Haeun Kim, Young-Hoon Whang, Dong Ryeol Chang, Dong Wook Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Pukyong Natl Univ Dept Ind Chem Busan 48513 South Korea Pukyong Natl Univ CECS Res Inst Busan 48513 South Korea Hanyang Univ Dept Energy Engn Seoul 04763 South Korea Hannam Univ Dept Adv Mat Daejeon 34054 South Korea Hanyang Univ Dept Semicond Engn Seoul 04763 South Korea

Wide-bandgap perovskite solar cells (PSCs) with high open-circuit voltage (V-oc) represent a compelling and emerging technological advancement in high-performing perovskite-based tandem solar cells. Interfacial engineering is an effective strategy to enhance V-oc in PSCs by tailoring the energy level alignments between the constituent layers. Herein, n-type quinoxaline-phosphine oxide-based small molecules with strong dipole moments is designed and introduce them as effective cathode interfacial layers. Their strong dipole effect leads to appropriate energy level alignment by tuning the work function of the Ag electrode to form an ohmic contact and enhance the built-in potential within the device, thereby improving charge-carrier transport and mitigating charge recombination. The organic interfacial layer-modified wide-bandgap PSCs exhibit a high V-oc of 1.31 V (deficit of <0.44 V) and a power conversion efficiency (PCE) of 20.3%, significantly improved from the device without an interface dipole layer (Voc of 1.26 V and PCE of 16.7%). Furthermore, the hydrophobic characteristics of the small molecules contribute to improved device stability, retaining 95% of the initial PCE after 500 h in ambient air.

关键词： perovskite solar cell interface dipole layer interfacial engineering charge transport

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Reconfigurable Resistive Switching Memory for Telegraph Code Sensing and Recognizing Reservoir Computing Systems

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SMALL 2024年第40期20卷 e2402961页

作者： Kim, Dohyung Phuoc Loc Truong Lee, Cheong Beom Bang, Hyeonsu Choi, Jia Ham, Seokhyun Ko, Jong Hwan Kim, Kyeounghak Lee, Daeho Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Gachon Univ Dept Mech Engn Gyeonggi 13120 South Korea Hanyang Univ Dept Chem Engn Seoul South Korea Sungkyunkwan Univ Dept Elect & Comp Engn Suwon 16419 South Korea Sungkyunkwan Univ Coll Informat & Commun Engn Suwon 16419 South Korea Hanyang Univ Dept Semicond Engn Seoul South Korea

Reservoir computing (RC) system is based upon the reservoir layer, which non-linearly transforms input signals into high-dimensional states, facilitating simple training in the readout layer-a linear neural network. These layers require different types of devices-the former demonstrated as diffusive memristors and the latter prepared as drift memristors. The integration of these components can increase the structural complexity of RC system. Here, a reconfigurable resistive switching memory (RSM) capable of implementing both diffusive and drift dynamics is demonstrated. This reconfigurability is achieved by preparing a medium with a 3D ion transport channel (ITC), enabling precise control of the metal filament that determines memristor operation. The 3D ITC-RSM operates in a volatile threshold switching (TS) mode under a weak electric field and exhibits short-term dynamics that are confirmed to be applicable as reservoir elements in RC systems. Meanwhile, the 3D ITC-RSM operates in a non-volatile bipolar switching (BS) mode under a strong electric field, and the conductance modulation metrics forming the basis of synaptic weight update are validated, which can be utilized as readout elements in the readout layer. Finally, an RC system is designed for the application of reconfigurable 3D ITC-RSM, and performs real-time recognition on Morse code datasets.

关键词： 3D ion transport channel Morse code neuromorphic reconfigurable resistive switching memory reservoir computing

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Spontaneously Induced Hierarchical Structure by Surface Energy in Novel Conjugated Polymer-Based Ultrafast-Response Organic Photodetectors

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ADVANCED OPTICAL MATERIALS 2022年第9期10卷

作者： Jeong, WonJo Kang, Jinhyeon Lim, Soo Yeong Ahn, Hyungju Kim, Hyung Min Won, Jong Ho Jung, In Hwan Hanyang Univ Dept Organ & Nanoengn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Kookmin Univ Dept Chem 77 Jeongneung Ro Seoul 136702 South Korea POSTECH Pohang Accelerator Lab Pohang 37673 South Korea

A novel conjugated polymer, poly(4-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophen-2-yl)-2,6-dioctylbenzo[1,2-d:4,5-d']bis(oxazole)) (PBB), is synthesized for use in ultrafast-response organic photodetectors (OPDs). The PBB synthesis is considered facile because a monomer could be isolated without column chromatography purification. The excellent solubility of PBB allows easy dissolution in both halogenated and nonhalogenated solvents, facilitating the fabrication of p-n heterojunction OPDs based-on PBB and 6,6-phenyl-C71-butyric acid methyl ester (PC71BM) using either chloroform (CF) or o-xylene (Xy). Notably, Xy-processed OPDs show superior performance with a responsivity (R) of 0.385 A W-1 and specific detectivity (D*) of 1.33 x 10(13) Jones at -1 V, whereas CF-based devices showed an R of 0.349 A W-1 and D* of 5.86 x 10(12) Jones. More importantly, Xy-processed OPDs exhibited an ultrafast signal response time of 3 mu s, which is much faster than that of CF-processed OPDs (42 mu s). These superior static and dynamic properties of PBB:PC71BM devices are achieved by the inverted hierarchical arrangement of PBB and PC71BM via a biased orientation of PC71BM toward the ZnO layer as well as a homogenous nanomorphology. This ideal morphology is spontaneously induced due to the difference in interfacial energy between PBB and PC71BM toward the ZnO surface and a well-mixed PBB:PC71BM blend in Xy solvent.

关键词： facile synthesis of conjugated polymer hierarchical arrangement high specific detectivity organic photodetector ultrafast response time

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Synergistic Inclusion Effects of Hard Magnetic Nanorods on the Magnetomechanical Actuation of Soft Magnetic Microsphere-Based Polymer Composites (Small 6/2024)

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SMALL 2024年第6期20卷 2305272-2305272页

作者： Park, Jeong Eun Kwon, Seung Hyuk Lu, Qi Choi, Hyoung Jin Wie, Jeong Jae Hanyang Univ Res Inst Ind Sci Dept Organ & Nano Engn Seoul 04763 South Korea Inha Univ Program Environm & Polymer Engn Incheon 22212 South Korea Inha Univ Dept Polymer Sci & Engn Program Environm & Polymer Engn Incheon 22212 South Korea Hanyang Univ Res Inst Ind Sci Inst Nano Sci & TechnolDept Chem Engn Dept Organ & Nano EngnHuman Tech Convergence Pro Seoul 04763 South Korea SUNY Coll Environm Sci & Forestry Michael M Szwarc Polymer Res Inst Dept Chem Engn Syracuse NY 13210 USA

The magnetomechanical actuation of micropillars is developed for the contactless manipulation of miniaturized actuators and microtextured surfaces. Anisotropic geometry of micropillars can significantly enhance the magnetic actuation compared with their isotropic counterparts by directional stress distributions. However, this strategy is not viable for triangular micropillars owing to insufficient anisotropy. In this study, a significant improvement in the magnetic actuation of triangular micropillars using composite magnetic particles is reported. A minute and optimal amount of hard magnetic gamma-ferrite nanorods are hybridized with soft magnetic iron microspheres to generate synergistic effects of magnetic coupling and percolation phenomenon on the magnetic actuation of polymer composites. The addition of 1 wt% face-centered cubic-phased gamma-ferrite nanorods suppresses the magnetic coupling interference of body-centered cubic-phased iron microspheres. Furthermore, the nanorods reduce the percolation threshold by participating in the percolation of the microspheres. A systematic compositional study on the magnetization and magnetorheological properties reveals that the coupling effect dominates the percolation effect at a low magnetic field, whereas the percolation effect governs the magnetic actuation at a high magnetic field. This hybrid approach can help in designing material constituents for effective magnetic actuators and robotic systems that can sensitively respond to an external magnetic field.

关键词： hard magnet magnetic composites magnetic coupling soft magnet structural percolation

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Defect-engineered composite with ammonium vanadate and 1T-MoS2 for superior aqueous zinc-ion battery applications

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APPLIED SURFACE SCIENCE 2023年 641卷

作者： Lee, Sanghyun Hwang, Jeonguk Park, Changyong Ahn, Suhyun Do, Kwanghyun Kim, Sungwook Lee, Kangmin Lee, Se Hun Salunkhe, Rahul R. Ahn, Heejoon Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Battery Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimni Ro Seoul 04763 South Korea Seoul Natl Univ Adv Inst Convergence Technol Suwon 16229 South Korea Indian Inst Technol Dept Phys Jammu 181221 Jammu & Kashmir India Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea

Aqueous zinc-ion batteries (AZIBs) are competitive energy-storage systems owing to their high ionic conductivity, safety, low cost, and eco-friendliness. Vanadium-based oxides have gained research interest as cathode materials for AZIBs because of their high capacities derived from their multivalent states and layered structures. However, vanadium-based oxides continue to exhibit poor performance as electrodes owing to critical issues, such as structural collapse, cation trapping, and poor electrical conductivity, which limit their practical application. Defect-engineered composite cathode materials consisting of (NH4)(2)V6O16 center dot 1.5H(2)O (NVO) nanorods and metallic 1T-MoS2 nanosheets were fabricated using a sonochemical method. NH4+ and H2O were co-intercalated into the NVO interlayer and served as pillars for stabilizing the layered structure. The 1T-MoS2 nanosheets promote fast charge transfer by providing conductive networks to the NVO. Furthermore, the oxygen defects in the NVO lattice weaken the electrostatic attraction between the inserted Zn2+ cations and the lattice oxygen layers, facilitating reversible Zn2+ (de)intercalation during charging-discharging. Consequently, the Od-NVO/Oi-MoS2 electrode exhibited a high capacity of 370.5 mAh/g at a current density of 0.2 A/g. In addition, it exhibited a high capacity of 141 mAh/g and maintained 92.5% of its initial capacity after 2000 cycles at 10 A/g.

关键词： Hybrid 1D-2D composite Defect engineering Ammonium vanadate Molybdenum disulfide Aqueous Zinc-ion battery

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