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RISS 인기검색어
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- 저자 : Kumar Ranveer (검색결과 3 건)
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Kumar, Mohit,Park, Dae Young,Singh, Ranveer,Jeong, Mun Seok,Som, Tapobrata,Kim, Joondong American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.39
<P>Despite high potential, the promise of 2D materials has not been realized practically because of limits of tiny grown size and difficult manipulation of the active spot. The utilization of 2D layers is the ultimate approach, which should be supported by large-scale production. In this very first report, we demonstrate the wafer-scale production of ReS<SUB>2</SUB> using the conventional sputtering method. The controllability of ReS<SUB>2</SUB> geometry has been investigated to form typical thin films or vertically aligned layers that are further applied for field emission. The vertically aligned ReS<SUB>2</SUB> layers exhibit ultralow turn-on electric field (0.6 V μm<SUP>-1</SUP>) with the current density (0.6 mA cm<SUP>-2</SUP>) and significantly low threshold electric field (0.8 V μm<SUP>-1</SUP>), respectively, along with outstanding emission stability. The results are attributed to weakly coupled ReS<SUB>2</SUB> layers and the high geometrical field enhancement factor (∼1.08 × 10<SUP>5</SUP>). Further, Kelvin probe force microscopy measurements confirm that lowering the work function is not solely responsible to achieve the ultralow operative field. Moreover, finite element simulation suggests that not only the length, width, and separation of the nanostructures but also the local slope plays an important role in suppressing screening effects.</P> [FIG OMISSION]</BR>
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Soni Sunil,Kumar Ranveer,Sodhiya Anubha,Patel Shwetambar,Singh Arun Kumar 한국탄소학회 2022 Carbon Letters Vol.32 No.6
Here, we have demonstrated the successful exfoliation of graphite into a layered material with scotch tape-like exfoliation. Sulfur acts as an exfoliating agent and exfoliates the loosely bounded graphite stacks. The shear force by ball milling provides the force required to overcome the van der Waals force between the layers. The MnO2 nanorods were synthesized using a KMnO4 precursor in a hydrothermal arrangement, and due to their intrinsic chemisorption capability, they were doped for polysulfide trapping. With an initial capacity of 1150 mAh/g achieved by the MnO2 nanorod-doped exfoliate-graphite/sulfur composite material, the material has displayed its application in lithium–sulfur batteries, but its use is not limited; it can be a low-cost eco-friendly solution to various energy storage systems with extensive structural qualities.
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Anji Reddy Polu,Ranveer Kumar,Valerio Causin,Ramesh Neppalli 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.1
Solid polymer electrolytes based on poly (ethylene glycol) (PEG) doped with Mg(CH_3COO)_2 have been prepared by using the solution-casting method. The X-ray diffraction patterns of PEG with Mg(CH_3COO)_2 salt indicated a decrease in the degree of crystallinity with increasing concentration of the salt. The complexation of Mg(CH_3COO)_2 salt with the polymer was confirmed by using Fourier transform infrared spectroscopy (FTIR) studies. The ionic conductivity was measured for the [PEG: Mg(CH_3COO)_2] system in the frequency range 50 Hz - 1 MHz. The addition of Mg salt was found to improve the ionic conductivity significantly. The 15-wt-% Mg(CH_3COO)_2-doped system had a maximum conductivity of 1.07 ?10^(−6) S/cm at 303 K. The conductance spectrum shows two distinct regions: a dc plateau and a dispersive region. The temperature dependence of the ionic conductivity reveals the conduction mechanism to be an Arrhenius-type thermally activated process.
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