Diamond film growth by HFCVD on Q-carbon seeded substrate

Sachan, Ritesh; Bhaumik, Amiya; Pant, Punam; Prater, J. T.; Narayan, J.

doi:10.1016/j.carbon.2018.09.058

Cited by 23 publications

(9 citation statements)

References 33 publications

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“…Recent reports further discuss the evidence of superconducting nature in B-doped Q-carbon at 110 K . Due to its extensive tetrahedral bonding, it provides a tremendous amount of nucleation sites (seeds) for growth of nano- and microdiamonds on nonlattice matched substrates like Al 2 O 3 with minimal compressive strain and graphitization by both nonequilibrium processing (multiple PLA shots) and equilibrium-based processing (HFCVD). , The solute trapping of N and Si defects in a diamond lattice leads to the formation of N–V center and Si–V center defects, which are highly desirable for quantum computing applications . Overall, the unique capabilities of Q-carbon constitute it as a potential candidate for next-generation technologies.…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium Structural Evolution of Q-Carbon and Interfaces

Sachan

Gupta

Narayan

2019

ACS Appl. Mater. Interfaces

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Q-carbon is a densely packed metastable phase of carbon formed by ultrafast quenching of carbon melt in a super-undercooled state. After quenching, diamond tetrahedra are randomly packed with >80% packing efficiency. This discovery has opened a pathway to fabricate various interesting heterostructures following the highly nonequilibrium route of nanosecond pulsed laser annealing. In the present work, we demonstrate the evolution of Q-carbon/α-carbon and Q-carbon/diamond heterostructures with atomically sharp interfaces, controlled via varying solidification rates of the undercooled C melt. This structure consists of ultrahard Q-carbon (∼80% sp3 and rest sp2) with an overlayer of soft α-carbon (∼40% sp3) on the inert c-Al2O3 substrate. Using high-resolution scanning transmission electron microscopy and Raman spectroscopy analysis, we present the formation of the highly dense Q-carbon/α-carbon bilayer structure with distinctly different atomic and electronic structures. The laser-solid interaction simulations coupled with atomistic ab initio modeling further confirm the conversion of C melt into Q-carbon by achieving maximum undercooling near the substrate and further into α-carbon with a decrease in regrowth velocity (<6 m/s) away from the substrate. We present details of the evolution of heterointerfaces formed from carbon melt for designing heterostructures far from equilibrium for various functional applications by using pulsed laser processing.

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Section: Introductionmentioning

confidence: 99%

Nonequilibrium Structural Evolution of Q-Carbon and Interfaces

Sachan

Gupta

Narayan

2019

ACS Appl. Mater. Interfaces

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“…Thereafter the insert was immediately kept inside the HFCVD chamber. Diamond powder(0-2m) 5 Combined diamond and tungsten powder From these two stages it was confirmed that the seeds were uniformly embedded into the cavity of the carbide inserts. The initial nucleation and growth were varied with the addition of these seed powders.…”

Section: Table-1 Shows About Different Deposition Parameters Along Wimentioning

confidence: 98%

“…The nucleation methods majorly rely on the different pretreatment processes for the substrate and also on the operating variables during different stages of the nucleation. Normally the substrate is exposed to different techniques like scratching or polishing by using abrasive powders, biasing, etching ultrasonically and also combinations of these methods [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Diamond Thin Film Coating on WC Substrate by HFCVD Method using Different Seeding Powders and Its Characterization

Padhi¹,

Behera²,

Pattnaik³

et al. 2019

IJRTE

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The formation of diamond thin solid film is studied by Hot Filament Chemical Vapor Deposition (HFCVD) by using different seeding powders on WC substrate. Here, we have deposited microcrystalline diamond (MCD) on SPUN cemented carbide (WC-Co) cutting tool insert using conventional HFCVD technique. The substrates were ultrasonically seeded with titanium, tungsten, molybdenum, diamond, combined diamond and tungsten powder at the same operation parameters to observe the difference in the growth of diamond by different seeding. Nucleation of diamond coating was studied after 40 minutes of coating with seeded substrate. The physical characteristics were studied by X-ray Diffraction (XRD).The Scanning Electron Microscope (SEM) was used to study the surface morphology. The diamond purity was studied with the help of Raman spectroscopy (RS). Reduction of cobalt percentage before and after pretreatment was studied by Energy Dispersive Spectroscopy (EDS). A very dense and uniform coating was deposited on the diamond powder seeded substrate. The nucleation density was found to be highest in diamond powder when compared with molybdenum and tungsten powder individually, because in initial stage the deposited material contains more sp 2 content as compared to sp 3 content. By using diamond and tungsten mixed powder the coating was uniform rather in case of only tungsten powder coating the discrete crystals were formed.

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“…Q-carbon has unique mechanical, chemical, and physical properties, thanks to which it has been given high attention, especially in field-controlled electronics and biomedicine [ 125 , 126 ]. Q-carbon has an amorphous structure consisting of 75–85% sp3 and residual sp2 hybridized carbon atoms, leading to various exciting properties such as extraordinary Hall effect, field emission, and higher hardness than diamond [ 127 , 128 ]. Most interesting of all, Q-carbon exhibits ferromagnetism at and above room temperature [ 129 ].…”

Section: Carbon Nanostructures and Their Compositesmentioning

confidence: 99%

Carbon Nanostructures, Nanolayers, and Their Composites

2021

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The versatility of the arrangement of C atoms with the formation of different allotropes and phases has led to the discovery of several new structures with unique properties. Carbon nanomaterials are currently very attractive nanomaterials due to their unique physical, chemical, and biological properties. One of these is the development of superconductivity, for example, in graphite intercalated superconductors, single-walled carbon nanotubes, B-doped diamond, etc. Not only various forms of carbon materials but also carbon-related materials have aroused extraordinary theoretical and experimental interest. Hybrid carbon materials are good candidates for high current densities at low applied electric fields due to their negative electron affinity. The right combination of two different nanostructures, CNF or carbon nanotubes and nanoparticles, has led to some very interesting sensors with applications in electrochemical biosensors, biomolecules, and pharmaceutical compounds. Carbon materials have a number of unique properties. In order to increase their potential application and applicability in different industries and under different conditions, they are often combined with other types of material (most often polymers or metals). The resulting composite materials have significantly improved properties.

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Diamond film growth by HFCVD on Q-carbon seeded substrate

Cited by 23 publications

References 33 publications

Nonequilibrium Structural Evolution of Q-Carbon and Interfaces

Nonequilibrium Structural Evolution of Q-Carbon and Interfaces

Diamond Thin Film Coating on WC Substrate by HFCVD Method using Different Seeding Powders and Its Characterization

Carbon Nanostructures, Nanolayers, and Their Composites

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