The synthesis of diamond at low pressure

Derjaguin, B.V.; Fedoseev, Dmitry

doi:10.1016/0079-6816(94)90032-9

Cited by 2 publications

(3 citation statements)

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“…Metastable materials can have strikingly unique properties that are quite distinct from their thermodynamic counterparts. Unfortunately, metastable inorganic materials, such as diamond, have historically proven difficult to synthesize [1,2,4,5] . However, polymorphic metastability is much more prevalent on the nanoscale than for bulk materials.…”

Section: Syntheses Of Colloidal Semiconductor Nanocrystals With Metasmentioning

confidence: 99%

“…Here, the term ‘metastable’ indicates only the relative thermodynamic stabilities between these two polymorphs; that is, it does not describe the timescale over which diamond will spontaneously convert to graphite. As a metastable polymorph of carbon, diamond is temporally persistent over long time scales due to the large activation energy barrier (from the required cleavage of sp 3 C−C bonds) that must be overcome for the reconstructive transformation of diamond into graphite [2] …”

Section: Introductionmentioning

confidence: 99%

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Polymorphic Metastability in Colloidal Semiconductor Nanocrystals

Tappan

Brutchey

2020

ChemNanoMat

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Metastable polymorphs of inorganic solids often possess material properties not present in the corresponding thermodynamic polymorphs, making them targets for the development of new functional materials. In contrast with isolating metastable bulk materials, syntheses of metastable polymorphs on the nanoscale are aided by fast non‐equilibrium reaction kinetics and the favorable thermodynamic influence of surface energies, giving rise to greater ease of access to metastable high‐temperature polymorphs and, in some cases, new polymorphs that do not exist in the bulk. The syntheses of metastable semiconductor nanocrystals are of interest for their potentially unique optoelectronic and physicochemical properties. However, in many material systems, synthesizing nanocrystalline products away from thermodynamic equilibrium in a predictable manner remains an outstanding challenge. This review outlines direct synthetic methodologies that have been developed to enable control over the nucleation and growth of metastable polymorphs of semiconductor nanocrystals by tailoring reaction conditions, precursor kinetics, ligand and surface effects, and other synthetic levers. The case studies reviewed herein expound on the direct syntheses of metastable ZnSe, Cu2SnSe3, CuInSe2, Ag2Se, and AgInSe2 nanocrystals, and although there remain numerous examples of metastable nanocrystal syntheses outside of these metal chalcogenide systems, the concepts discussed are of general utility to the field of metastable nanocrystal syntheses as a whole. Explicit examples in which new functional properties are afforded by metastable polymorphs of the aforementioned material systems are presented within the context of applications for solar cells, photonics, and optical sensing. Finally, the factors that affect the kinetic persistence of metastable nanocrystalline polymorphs are discussed at length for these material systems.

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Section: Syntheses Of Colloidal Semiconductor Nanocrystals With Metasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymorphic Metastability in Colloidal Semiconductor Nanocrystals

Tappan

Brutchey

2020

ChemNanoMat

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“…Reviews of the development of deposition techniques and improvements to existing processes have been presented by several authors. [1][2][3] Because nucleation often can be a limiting step in vapordeposition techniques, the growth of diamond can be improved by supplying nucleation sites to the substrate. Diamond readily deposits onto preexisting seed crystals, and, thus, film growth is significantly enhanced.…”

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confidence: 99%

Diamond‐Coated Silicon Carbide Whiskers

Demkowicz

Bell

Gilbert

et al. 1999

Journal of the American Ceramic Society

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Colloidal techniques have been used to seed SiC whiskers with submicrometer-sized diamond particles. The diamond and SiC particulates are co-suspended in an aqueous medium and cast to form highly porous bodies. Electron cyclotron resonance chemical vapor deposition is used to grow dense, polycrystalline diamond coatings on the seeded whiskers. The low packing density of the cast green bodies allows for infiltration of the growth zone beneath the exposed surface. Electron microscopy is used to estimate the coating thickness and depth of growth infiltration.

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The synthesis of diamond at low pressure

Cited by 2 publications

References 0 publications

Polymorphic Metastability in Colloidal Semiconductor Nanocrystals

Polymorphic Metastability in Colloidal Semiconductor Nanocrystals

Diamond‐Coated Silicon Carbide Whiskers

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