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RISS 인기검색어
- 검색키워드
- 저자 : Sumanta Kumar Sahoo (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Simple, Fast and Cost-Effective Electrochemical Synthesis of Few Layer Graphene Nanosheets
Sumanta Kumar Sahoo,Archana Mallik 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.2
"We report an effcient and green approach for mass production of few layered graphene nanosheets (FLGNSs) by intercalation and exfoliation of pyrolytic graphite sheet in a simple protic, H2SO4 electrolyte. The as-prepared FLGNSs at the optimum intercalate concentration of 0.5M H2SO4 is able to produce large domain of lateral dimension of 11–26µm consisting of 4–6 stacked graphene layers, as confirmed by field emission scanning electron microscopy and atomic force microscopy, respectively. Surface oxygenation and a characteristic absorbance peak at 228nm are well observed for electrochemical exfoliated FLGNSs from Fourier transform infrared spectroscopy and UV–Vis spectra respectively. (002) planes of the obtained graphene sheets have been confirmed from X-ray diffraction pattern. The characteristic Raman bands have been observed at 1354 cm-1 and 1590 cm-1 in the exfoliated FLGNSs. "
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Morphological Dependence of Field Emission Properties of Silicon Nanowire Arrays
Sumanta Kumar Sahoo,Arumugam Marikani 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
The electron field emission (EFE) properties of vertically aligned arrays of silicon nanowires (SiNWs) grown from silicon substrate at different gold sputtering periods of 0 s, 8 s, 15 s and 25 s at a rate of 10 nm/min by electroless metal deposition process were investigated. It has been observed that the transformation of silicon tips from irregular to highly dense and uniform cylindrical morphological nanostructures with an increase in Au sputtering periods. A significant enhancement in EFE properties of as-prepared arrays of SiNWs with the increase in Au sputtering periods is observed. The threshold fields for attaining current density of 0.1 mA cm-2 were decreased gradually as 32.38 Vµm-1, 29.37 Vµm-1 and 23.19 Vµm-1 for the arrays of SiNWs synthesized from Si substrate by Au coating of 8 s, 15 s and 25 s respectively. Moreover, from Fowler–Nordheim plot, the turn-on field is observed to decrease from 16.56 V/µm for as-prepared to 8.77 V/µm for 25 s Au sputtered SiNW arrays. The effective work functions of the electron emitting array of SiNWs have been improved from 0.5 meV to 0.1 meV.
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Fundamentals of Fascinating Graphene Nanosheets: A Comprehensive Study
Sumanta Kumar Sahoo,Archana Mallik 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.3
Graphene nanosheets have attracted immense research interest among the materials science community from electronics to the biomedical field. Being the first member of two-dimensional nanomaterials family, discovered in 2004 followed by the Nobel Prize winning in 2010, it is now readily witnessing global industrial revolutions. The nanomaterial is bestowed with such unprecedented features that can be tangible to a wide spectrum of applications ranging from energy storage devices to sensor application. Enormous flattened surfaces, superior mechanical strength and flexibility, ballistic intrinsic carrier mobility, nearly transparent nature, high thermal conductivity and room-temperature ferromagnetic behavior are few of the extraordinary attributes of the monolayer of carbon nanosheets. In this comprehensive review, an attempt has been put forward to precisely revisit and represent the literature available on the fundamental properties of graphene nanomaterials. Also, the usage of its characteristic features in various applications as well as synthesis process has been briefly discussed.
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Modified Graphene/Polyaniline Nanocomposites for Supercapacitor Application
Sumanta Sahoo,Chapal Kumar Das,G. Karthikeyan,G. C. Nayak 한국고분자학회 2012 Macromolecular Research Vol.20 No.4
This work explored the effect of graphene surface modification on the electrochemical performance of polyaniline-based nanocomposite. The surface modification of graphene was confirmed by Fourier transform infrared spectroscopy. Field emission scanning electron microscopy and high-resolution transmission electron microscopy showed uniform polyaniline coating of the modified graphene. The specific capacitance of the graphene/polyaniline composite was 242 F/g, but it decreased to 193 F/g after graphene modification. However, the capacitance retention increased from 86% to 89% after 500 cycles due to the graphene modification. The thermal stability of the composite also increased after the graphene modification.
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Manjiri A. Mahadadalkar,Ganesh Dhakal,Sumanta Sahoo,Deivasigamani Ranjith Kumar,Marjorie Lara Baynosa,Van Quang Nguyen,Mostafa Saad Sayed,Abdelrahman M. Rabie,Woo Kyoung Kim,Jae-Jin Shim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Heterojunction TiO2/In2S3 composite photocatalyst was prepared using a simple low-temperature onestephydrothermal method. In2S3 nanosheets with a thickness of 1–5 nm were decorated with 20–30 nm TiO2 nanoparticles, forming a stable heterojunction. The electron transfer mechanism and bandalignment between TiO2 and In2S3 was studied using X-ray photoelectron spectroscopy and UV–visiblespectroscopy, which suggested the formation of an S-scheme heterojunction in TiO2/In2S3 composite. The TiO2/In2S3 composite with a 1:1 mole ratio showed 99.9% photocatalytic degradation ofRhodamine B within 20 minutes of solar light irradiation, which was better than the results for pristineTiO2, pristine In2S3, and their physical mixture, as well as any other previously reported materials of thesame kind. The as-prepared TiO2/In2S3 composite showed excellent stability (98% for Rhodamine B) evenafter five successive reuse cycles. This excellent performance of TiO2/In2S3 was attributed to the S-schemeheterojunction because of an internal electric field, columbic attraction, and band bending. A radical trappingstudy showed that superoxide radicals O2 contribute the most to the photocatalytic degradationof Rhodamine B followed by hydroxyl radicals (OH) and holes (hVB+ ). The use of a low synthesis temperatureand a simple, one-step formation method, with no secondary pollutants generated, makes this processan environmentally friendly and sustainable solution for cost-effective wastewater treatment,highlighting its future commercial applications.
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