Carbon nano-flake ball with a sandwich-structure composite of diamond core covered by graphite using single-step microwave plasma chemical vapor deposition

Tsai, Ping-Huan; Tsai, Hung-Yin

doi:10.1016/j.carbon.2018.04.023

Cited by 16 publications

(18 citation statements)

References 49 publications

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“…[4,7,[22][23][24][25] The aforementioned N-UNCD is the diamond-graphite hybrid nanocarbon thin films, reported in various names, which might be categorized into two: 1D (core-shell structure: wire, needle, and rod) [4][5][6][7][8][9][10][11][12][13][14][15] and 2D nanostructure (sandwich structure: flake, platelet, and wall). [16][17][18][19][20][21][22][23][24][25] The similarity between their respective high-resolution transmission electron microscopy (HR-TEM) images: 1D (diamond-graphite core-shell nanowire) versus 2D (diamond inner layer sandwiched between two graphite layers) initially induced some confusion. Recently, the 2D structure is getting a wider recognition based upon scanning electron microscopy (SEM) and AFM, [15][16][17][18][19][20][21][22][23][24][25] while the reports on the genuine 1D structure remains rather limited in number.…”

Section: Introductionmentioning

confidence: 99%

Bottom–Up Evolution of Diamond–Graphite Hybrid Two‐Dimensional Nanostructure: Underlying Picture and Electrochemical Activity

Cho

Lee

et al. 2021

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It recently culminated as the nitrogen-included ultrananocrystalline diamond (N-UNCD), which was reported to be the only successful form of diamond for neural stimulation and recording. [14] The N-UNCD is fabricated through the intriguing bottom-up evolution of the diamond-graphite hybrid nanostructure under chemical vapor deposition (CVD). [4][5][6][7][8][9] While the material is indeed outstanding in the neural stimulation and recording, there's still an important issue to be resolved: their performance for the simultaneous electrochemical detection of the neural transmitter, for example, dopamine (DA) in presence of ascorbic acid (AA) and uric acid (UA) is still far from satisfactory, [26,27] as compared to that of the nanocarbon-powder-based porous thin films. [28] Furthermore, the detection of AA in presence of interference from DA and UA, which is inevitable in many biological samples, [29] is particularly challenging, relative to those of DA and UA, which might be attributed to the lack of π-π molecular bonding route of AA absorption on carbon electrode. [30,31] Such challenging situation was persistent until recently despite the decade-long presence of the diamond-graphite hybrid nanostructured thin film, and one might attribute it to the lack of the fundamental understanding of the bottom-up evolution mechanism of the hybrid film, which is essential for a proper optimization of materials performance throughThe diamond-graphite hybrid thin film with low-dimensional nanostructure (e.g., nitrogen-included ultrananocrystalline diamond (N-UNCD) or the alike), has been employed in many impactful breakthrough applications. However, the detailed picture behind the bottom-up evolution of such intriguing carbon nanostructure is far from clarified yet. Here, the authors clarify it, through the concerted efforts of microscopic, physical, and electrochemical analyses for a series of samples synthesized by hotfilament chemical vapor deposition using methane-hydrogen precursor gas, based on the hydrogen-dependent surface reconstruction of nanodiamond and on the substrate-temperature-dependent variation of the growth species (atomic hydrogen and methyl radical) concentration near substrate. The clarified picture provides insights for a drastic enhancement in the electrochemical activities of the hybrid thin film, concerning the detection of important biomolecule, that is, ascorbic acid, uric acid, and dopamine: their limits of detections are 490, 35, and 25 nm, respectively, which are among the best of the all-carbon thin film electrodes in the literature. This work also enables a simple and effective way of strongly enhancing AA detection.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202105087.

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Section: Introductionmentioning

confidence: 99%

Bottom–Up Evolution of Diamond–Graphite Hybrid Two‐Dimensional Nanostructure: Underlying Picture and Electrochemical Activity

Cho

Lee

et al. 2021

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“…Structures with high stiffness and strength-to-weight ratio are generally inefficient sound barriers, thus designing light weight load-bearing structures with desirable acoustical properties is of paramount importance in aerospace ground and marine vehicles. Periodic lattice sandwich truss structures, comprising of two thin yet stiff face sheets separated by cores with open cell topology, namely, trusses, have recently emerged as potential candidates to design such structures [13][14][15][16][17][18][19] . Various open cell topological configurations have been proposed, including tetrahedron 13,17 , 3D kagome 18 , diamond 19 , and pyramid 14 , among which periodic lattice sandwich truss structure with pyramidal truss cores, namely PLSS, are considered to be very promising 13 .…”

Section: Introductionmentioning

confidence: 99%

“…Periodic lattice sandwich truss structures, comprising of two thin yet stiff face sheets separated by cores with open cell topology, namely, trusses, have recently emerged as potential candidates to design such structures [13][14][15][16][17][18][19] . Various open cell topological configurations have been proposed, including tetrahedron 13,17 , 3D kagome 18 , diamond 19 , and pyramid 14 , among which periodic lattice sandwich truss structure with pyramidal truss cores, namely PLSS, are considered to be very promising 13 . While properties of PLSS like out-of-plane compression and shear 20 , free vibration 21,22 , and shock loading 23 have been broadly exploited, very limited studies have been conducted on their sound insulation capability.…”

Section: Introductionmentioning

confidence: 99%

On sound insulation of pyramidal lattice sandwich structure

Liu

Chen

Zhang

et al. 2019

Composite Structures

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Pyramidal lattice sandwich structure (PLSS) exhibits high stiffness and strength-to-weight ratio which can be effectively utilized for designing light-weight load bearing structures for ranging from ground to aerospace vehicles. While these structures provide superior strength to weigh ratio, their sound insulation capacity has not been well understood. The aim of this study is to develop numerical and experimental methods to fundamentally investigate the sound insulation property of the pyramidal lattice sandwich structure with solid trusses (PLSSST). A finite element model has been developed to predict the sound transmission loss (STL) of PLSSST and simulation results have been compared with those obtained experimentally. Parametric studies is then performed using the validated finite element model to investigate the effect of different parameters in pyramidal lattice sandwich structure with hollow trusses (PLSSHT), revealing that the pitching angle, the uniform thickness and the length of the hollow truss and the lattice constant have considerable effects on the sound transmission loss. Finally a design optimization strategy has been formulated to optimize PLSSHT in order to maximize STL while meeting mechanical property requirements. It has been shown that STL of the optimal PLSSHT can be increased by almost 10% at the low-frequency band. The work reported here provides useful information for the noise reduction design of periodic lattice structures. Numerical SimulationThe FE model of the PLSSST has been developed in commercial software LMS Virtual.Lab 11. Direct acoustic vibration coupling theory available in the LMS Virtual.Lab is utilized to study the STL behavior of PLSSST. The three-dimensional (3D) models of PLSSST, the reverberation chamber, and the anechoic chamber are, first, built in CATIA (the related geometric parameters are summarized in Table S1) and saved as Initial Graphics Exchange Specification (IGES) files, and then they are imported into Altair HyperMesh for meshing. The element type for the panel and the rod are Pshell and Psolid, respectively; while the reverberation chamber and the anechoic chamber are occupied by Tetrahedral elements. PLSSST is modeled by 421,024 elements with a nominal maximum size of 1 mm and 466,130 nodes.The material of PLSSST is aluminium with the material density, Young's modulus, and Poisson ration as 2810 Kg/mm 3 , 71 GPa, and 0.33, respectively. The loss factor of the panel and the bar are set to be 0.0001 and 0.4, respectively, considering that viscoelastic materials would be used to bond the bar and the panel. In FE model, two acoustic grids are established on both sides of the sandwich structure to simulate the reverberation chamber and the anechoic chamber. The reverberation chamber and the anechoic

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“…Carbon-based materials fabricated by catalytic chemical vapor deposition (CVD), such as graphene, carbon nanotubes (CNTs), carbon nanofibers (CNFs), diamond and microcrystalline graphite, have good electrical properties [1][2][3][4]. They are considered as ideal candidates for field emitters [5,6].…”

Section: Introductionmentioning

confidence: 99%

Controllable Synthesis of Special Reed-Leaf-Like Carbon Nanostructures Using Copper Containing Catalytic Pyrolysis for High-Performance Field Emission

et al. 2019

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Special reed-leaf-like carbon nanostructures have been realized by using chemical vapor deposition (CVD) under the combined action of copper containing catalytic pyrolysis and ammonia (NH3) gas. The nucleation and growth mechanisms of CNLs based on growth parameters are discussed. The Raman spectra of carbon nanotubes (CNTs), CNLs and CNT-CNL composites were measured and found to be strongly influenced by the type of gas. Field emission (FE) properties of CNL-CNT composites were observed with a lower turn-on electric field of 0.73 V/µm, and a higher current density of 18.0 mA/cm2 at an electric field of 2.65 V/µm, which are superior to those of CNTs and flower-like CNLs. This is because there are more field emitters in CNLs inter-planted in CNTs. We consider that the unique FE stability of CNTs and defects in CNLs play a synergetic role on the improved FE properties.

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Carbon nano-flake ball with a sandwich-structure composite of diamond core covered by graphite using single-step microwave plasma chemical vapor deposition

Cited by 16 publications

References 49 publications

Bottom–Up Evolution of Diamond–Graphite Hybrid Two‐Dimensional Nanostructure: Underlying Picture and Electrochemical Activity

Bottom–Up Evolution of Diamond–Graphite Hybrid Two‐Dimensional Nanostructure: Underlying Picture and Electrochemical Activity

On sound insulation of pyramidal lattice sandwich structure

Controllable Synthesis of Special Reed-Leaf-Like Carbon Nanostructures Using Copper Containing Catalytic Pyrolysis for High-Performance Field Emission

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