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Wearable heater composites comprising traditional Hanji cellulose fibers coated with graphene,silver nanowires,and PEDOT:PSS via scalable supersonic spraying

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Journal of Materials Science & Technology 2023年第33期164卷 27-36页

作者： Woojin Lim Ashwin Khadka Byeong-Yeop Kim Chanwoo Park Ali Aldalbahi Govindasami Periyasami Bhavana Joshi Sam S.Yoon School of Mechanical Engineering Korea UniversitySeoul 136-713Republic of Korea Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

Traditional Korean Hanji paper and cotton fabric were introduced as flexible substrates in the fabrication of graphene-coated *** nanowires and PEDOT:PSS were added to increase the electrical conductivity of the heaters,thereby enhancing their heating *** optimal concentrations of silver nanowires and PEDOT:PSS with respect to that of graphene were *** active materials were deposited on flexible Hanji/cotton and non-flexible alumina substrates using supersonic *** proposed Hanji-and cotton-based heaters were light,wearable,stretchable,skin-friendly,and *** unyielding alumina-based heater exhibited the highest heating temperature of 275°C at 13 *** heater bendability and stretchability were tested considering multiple bending and stretching ***,water boiling and fabric drying were successfully performed using the alumina-based *** supersonic spraying deposition technique was used to produce writable and patternable heaters.

关键词： Graphene Silver nanowires PEDOT:PSS supersonic spraying Hanji Wearable heater

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Reduced graphene oxide supersonically sprayed on wearable fabric and decorated with iron oxide for supercapacitor applications

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Journal of Materials Science & Technology 2021年第23期82卷 47-56页

作者： Ali Aldalbahi Edmund Samuel Bander S.Alotaibi Hany El-Hamshary Sam S.Yoon Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia School of Mechanical Engineering Korea UniversitySeoul136-713Republic of Korea

We demonstrate the fabrication of wearable supercapacitor *** electrodes were applied to wearable fabric by supersonically spraying the fabric with reduced graphene oxide(r GO)followed by decoration with iron oxide(Fe_(2)O_(3))nanoparticles via a hydrothermal *** integration of iron oxide with r GO flakes on wearable fabric demonstrates immense potential for applications in high-energystorage *** synergetic impact of the intermingled r GO flakes and Fe_(2)O_(3) nanoparticles enhances the charge transport within the composite electrode,ultimately improving the overall electrochemical *** advantage of the porous nature of the fabric,electrolyte diffusion into the active r GO and Fe_(2)O_(3) materials was significantly enhanced and subsequently increased the electrochemical interfacial *** effect of the Fe_(2)O_(3) concentration on the overall electrochemical performance was *** optimal composition yields a specific capacitance of 360 F g^(-1) at a current density of 1 Ag^(-1) with a capacitance retention rate of 89%after 8500 galvanostatic cycles,confirming the long-term stability of the Fe_(2)O_(3)/r GO fabric electrode.

关键词： supersonic spraying Conductive textile Wearable energy devices Reduced graphene oxide Iron oxide Supercapacitor

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supersonically sprayed self-aligne d rGO nanosheets and ZnO/ZnMn_(2)O_(4)nanowires for high-energy and high-power-density supercapacitors

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Journal of Materials Science & Technology 2023年第6期137卷 193-204页

作者： Chanwoo Park Edmund Samuel Byeong-Yeop Kim Seongpil An Hae-Seok Lee Sam S.Yoon School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversityRepublic of Korea SKKU Advanced Institute of Nanotechnology(SAINT)and Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Core-shell-type bimetallic oxide and carbon composites comprising zinc oxide(ZnO)nanospheres and zinc manganese oxide(ZnMn_(2)O_(4))nanowires were produced by a hydrothermal method,and supersoni-cally sprayed together with reduced graphene oxide(rGO)nanosheets onto Ni foil to fabricate flexible *** supersonic impact facilitated the exfoliation of the rGO nanosheets,thereby increasing the surface area and adhesion of the composite particles to the *** rGO nanosheets were vertically aligned during the supersonic impact and formed localized zones,enabling optimal accommodation of the ZnO/ZnMn_(2)O_(4)*** localization,with the addition of rGO,reduced the agglomeration of ZnO/ZnMn_(2)O_(4)*** molar concentration of MnSO_(4)used in the synthesis of ZnO/ZnMn_(2)O_(4)was varied from 0.05 to 0.15 mol/L to determine the optimal MnSO_(4)concentration that would result in the highest energy storage *** unique nanostructure of ZnO/ZnMn_(2)O_(4)and the self-alignment of rGO sheets facilitated a favorable environment for high energy storage capability with a specific capaci-tance of 276.3 mF·cm^(−2)at a current density of 0.5 mA·cm^(−2)and an energy density of 98.2μWh·cm^(−2)at a power density of 1600μW·cm^(−2).The width of the potential window was increased to 1.2 V,imply-ing a significant increase in the energy storage capability of the *** retention of 88%was achieved after 10,000 charge/discharge cycles for the supercapacitor fabricated using an optimal MnSO_(4)concentration(0.10 mol/L)during the composite synthesis.

关键词： ZnO/ZnMn_(2)O_(4)nanowires rGO nanosheets Hydrothermal method supersonic spraying Supercapacitor

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