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Search: WFRF:(Jarvinen Topias)

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1.
  • Asres, Georgies Alene, et al. (author)
  • High photoresponse of individual WS2 nanowire-nanoflake hybrid materials
  • 2018
  • In: Applied Physics Letters. - : AMER INST PHYSICS. - 0003-6951 .- 1077-3118. ; 112:23
  • Journal article (peer-reviewed)abstract
    • van der Waals solids have been recognized as highly photosensitive materials that compete conventional Si and compound semiconductor based devices. While 2-dimensional nanosheets of single and multiple layers and 1-dimensional nanowires of molybdenum and tungsten chalcogenides have been studied, their nanostructured derivatives with complex morphologies are not explored yet. Here, we report on the electrical and photosensitive properties of WS2 nanowire-nanoflake hybrid materials we developed lately. We probe individual hybrid nanostructured particles along the structure using focused ion beam deposited Pt contacts. Further, we use conductive atomic force microscopy to analyze electrical behavior across the nanostructure in the transverse direction. The electrical measurements are complemented by in situ laser beam illumination to explore the photoresponse of the nanohybrids in the visible optical spectrum. Photodetectors with responsivity up to similar to 0.4 AW(-1) are demonstrated outperforming graphene as well as most of the other transition metal dichalcogenide based devices. Published by AIP Publishing.
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2.
  • Wei, Jiayuan, et al. (author)
  • Green carbon nanofiber networks for advanced energy storage
  • 2020
  • In: ACS Applied Energy Materials. - : American Chemical Society (ACS). - 2574-0962. ; 3:4, s. 3530-3540
  • Journal article (peer-reviewed)abstract
    • Energy storage devices such as supercapacitors of high-performance are in great need due to the continuous expansion of digitalization and related devices for mobile electronics, autonomous sensors and vehicles of different kinds. However, the non-renewable resources and often complex preparation processes associated with electrode materials and structure pose limited scale-up in production and difficulties in versatile utilization of the devices. Here, free-standing and flexible carbon nanofiber networks derived from renewable and abundant bio-resources are demonstrated. By a simple optimization of carbonization, the carbon nanofiber networks reach a large surface area of 1670 m2 g-1 and excellent specific gravimetric capacitance of ~240 F g-1, outperforming many other nanostructured carbon, activated carbon and even those decorated with metal oxides. The remarkable electrochemical performance and flexibility of the green carbon networks enable an all-solid-state supercapacitor device, which displays a device capacitance of 60.4 F g-1 with a corresponding gravimetric energy density of 8.4 Wh kg-1 while maintaining good mechanical properties.
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