Q-carbon harder than diamond

Narayan, J.; Gupta, Siddharth; Sachan, Ritesh; Cellini, Filippo

doi:10.1557/mrc.2018.35

Cited by 38 publications

(38 citation statements)

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“…The experimentally measured Young's modulus of Qcarbon as 1702 ± 138 GPa, compared to 1015 ± 107 GPa for diamond and 350 ± 30 GPa for sapphire[9].…”

mentioning

confidence: 79%

“…Using these measurements ( Figure 5), we obtained effective stiffness (Young's modulus) of Q-carbon as 1702 ± 138 GPa, compared to 1015 ± 107 GPa for diamond and 350 ± 30 GPa for sapphire. Using this value of E, for diamond υ is estimated to be 0.115 [9]. Using this value of υ, the shear moduli of diamond and Q-carbon are estimated to be 455 and 789 GPa, respectively.…”

Section: Enhanced Hardness Of Q-carbon Harder Than Diamondmentioning

confidence: 97%

“…Nanoindentation combined with finite element modeling has been used to measure hardness of Q-carbon, and results compared with similar measurements on diamond, sapphire, and SiC at the same time. In the atomic force microscopy (AFM)-based MoNI [8] technique, force is measured as a function of indentation depth and slope is used to extract stiffness of Q-carbon films [9]. (Figure 3(c)).…”

Section: Introductionmentioning

confidence: 99%

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Progress in Q-carbon and related materials with extraordinary properties

Narayan

Bhaumik

Gupta

et al. 2018

Materials Research Letters

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This paper summarizes our research related to Q-carbon and Q-BN and direct conversion of carbon into diamond and h-BN into c-BN. Synthesis and processing of these materials are accomplished by nanosecond laser melting and subsequent quenching of amorphous carbon and nanocrystalline h-BN. Depending upon the degree of undercooling, molten carbon (or h-BN) can be converted into Q-carbon (or Q-BN) or diamond (or c-BN). The primary focus here is on the outstanding properties of these materials, including hardness greater than diamond, ferromagnetism, pand n-type doping, NV nanodiamonds, high-temperature superconductivity in B-doped Q-carbon, enhanced field emission, superhard composite coatings, and future applications. IMPACT STATEMENT This research represents a fundamental breakthrough in the direct conversion of carbon into diamond at ambient temperatures and pressures in the air and their extraordinary properties.

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“…The experimentally measured Young's modulus of Qcarbon as 1702 ± 138 GPa, compared to 1015 ± 107 GPa for diamond and 350 ± 30 GPa for sapphire[9].…”

mentioning

confidence: 79%

Section: Enhanced Hardness Of Q-carbon Harder Than Diamondmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Progress in Q-carbon and related materials with extraordinary properties

Narayan

Bhaumik

Gupta

et al. 2018

Materials Research Letters

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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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“…Современная мировая потребность в сверхтвердых инструментальных материалах (СТМ), применяющихся в области разведки и добычи минерального сырья, обеспечивается природными и синтетическими алмазами (СА), кубическим нитридом бора (КНБ) и другими сверхтвердыми материалами. Кроме того, развитие нанонауки позволяет синтезировать на уровне нанотехнологий новые сверхтвердые материалы в виде композитов СА и КНБ [1,2]. Однако из-за синтеза в условиях высоких температур и давлений эти материалы имеют высокую стоимость и применяются в основном в высокорентабельных производствах, таких как нефтяная и газовая промышленность.…”

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