Author
Harikishan Kannan
Other affiliations: Shanmugha Arts, Science, Technology & Research Academy
Bio: Harikishan Kannan is an academic researcher from Rice University. The author has contributed to research in topics: Diamond & Surface roughness. The author has an hindex of 2, co-authored 6 publications receiving 13 citations. Previous affiliations of Harikishan Kannan include Shanmugha Arts, Science, Technology & Research Academy.
Papers
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TL;DR: In this paper, the structural, electrical, mechanical, optical, and thermal properties of 2D hexagonal boron nitride (h-BN) have been extensively studied.
Abstract: Hexagonal boron nitride (h-BN) has emerged as a strong candidate for two-dimensional (2D) material owing to its exciting optoelectrical properties combined with mechanical robustness, thermal stability, and chemical inertness. Super-thin h-BN layers have gained significant attention from the scientific community for many applications, including nanoelectronics, photonics, biomedical, anti-corrosion, and catalysis, among others. This review provides a systematic elaboration of the structural, electrical, mechanical, optical, and thermal properties of h-BN followed by a comprehensive account of state-of-the-art synthesis strategies for 2D h-BN, including chemical exfoliation, chemical, and physical vapor deposition, and other methods that have been successfully developed in recent years. It further elaborates a wide variety of processing routes developed for doping, substitution, functionalization, and combination with other materials to form heterostructures. Based on the extraordinary properties and thermal-mechanical-chemical stability of 2D h-BN, various potential applications of these structures are described.
119 citations
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TL;DR: In this paper, a comparative study on the oxidation of microcrystalline diamond powder (DP) and polycrystaline diamond film (PCD) by wet chemical treatments, including various acid mixtures, as well as by dry processes, including O2 plasma and UV ozone, is presented.
20 citations
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TL;DR: In this article, the influence of hexamethylenetetramine (HMTA) concentrations on the growth of ZnO nanostructures and their room temperature sensing performance were investigated.
9 citations
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4 citations
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23 Mar 2021
TL;DR: In this article, a colloidal synthesis method was used to create molybdenum (Mo) sulfide (MoS2−x) structures and substitute them with zerovalent copper (Cu) atoms.
Abstract: Studies on intercalation or substitution of atoms into layered two-dimensional (2D) materials are rapidly expanding and gaining significant consideration due to their importance in electronics, catalysts, batteries, sensors, etc. In this manuscript, we report a straightforward method to create sulphur (S) deficient molybdenum (Mo) sulfide (MoS2−x) structures and substitute them with zerovalent copper (Cu) atoms using a colloidal synthesis method. The synthesized materials were studied using several techniques to understand the proportion and position of copper atoms and the effect of copper functionalization. Specifically, the impact of change in the ratio of Cu : S and the hydrogen evolution reaction (HER) activity of the derived materials were evaluated. This technique paves the way for the synthesis of various functionalized 2D materials with a significant impact on their physical and chemical behavior making them potential candidates for catalysis and several other applications such as energy storage and the development of numerous functional devices.
3 citations
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01 May 1993
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Abstract: Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.
29,323 citations
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TL;DR: In this article , the authors present feasible design strategies for constructing defect sites (including edge defects, vacancy defects, and dopant derived defects) in 2D materials to improve their hydrogen evolution reaction (HER) performance.
55 citations
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TL;DR: In this paper, a novel one-dimensional shish-kebab structures composed of active (110)-faceted α-MnO2 nanowires as backbones and (111)-Faceted Co3O4 nanocrystals as shells were prepared by a hydrothermal method followed by an in-situ epitaxial attachment growth strategy.
Abstract: Novel one-dimensional shish-kebab structures composed of active (110)-faceted α-MnO2 nanowires as backbones and (111)-faceted Co3O4 nanocrystals as shells were prepared by a hydrothermal method followed by an in-situ epitaxial attachment growth strategy. A series of characterization revealed the formation of Co3O4@MnO2 heterostructures with closely integrated hetero-interfaces. The growth mechanism study suggested that the multiple functions of hexamethylenetetramine were crucial for the the successful growth of the Co3O4@MnO2 heterostructures. The gas sensing performance of the Co3O4@MnO2 heterostructures was studied for the first time. It was shown that the Co3O4@MnO2 heterostructures exhibited obvious enhanced triethylamine sensing performance compared with bare MnO2 nanowires and Co3O4 nanocrystals, suggesting a strong synergistic effect. The unique one-dimensional shish-kebab structures, increased surface active oxygen species and closely-attached hetero-interface were the key factors to improve the triethylamine sensing performance. The work not only provide an in-situ strategy for the synthesis of one-dimensional heterostructures, but also provide an effective way to improve the inherently low gas response of α-MnO2 through comprehensive design of morphology, crystal facet and hetero-interface. Moreover, thanks to the unique morphology, surface and interface characteristics of the Co3O4@MnO2 heterostructures, they are expected to be used in more fields, such as batteries, supercapacitor and catalysis.
36 citations
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TL;DR: In this paper , an advanced heterostructure photocatalyst constructed by hexagonal boron nitride (h-BN) and flower-ring g-C3N4 (MCN) was successfully synthesized.
34 citations
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TL;DR: In this paper , a P-doped h-BN (PBN) nanosheets are used to support the in-situ growth of ZnIn2S4 nanoflowers via wet chemical method, and sandwich-like PBN/ZnInS4 hierarchical heterostructures are successfully synthesized.
33 citations