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Diamond : = An Experimental Determination of Diamond Nucleation, Nuclear Magnetic Resonance Spectroscopy of Diamondoids, and Development of a Novel Technique for Color Center Fabrication.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Diamond :/
Reminder of title:	An Experimental Determination of Diamond Nucleation, Nuclear Magnetic Resonance Spectroscopy of Diamondoids, and Development of a Novel Technique for Color Center Fabrication.
Author:	McQuade, Patrick.
Description:	1 online resource (103 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
Contained By:	Dissertations Abstracts International85-11B.
Subject:	Transmission electron microscopy. -
Online resource:	click for full text (PQDT)
ISBN:	9798382635576

Diamond : = An Experimental Determination of Diamond Nucleation, Nuclear Magnetic Resonance Spectroscopy of Diamondoids, and Development of a Novel Technique for Color Center Fabrication.
McQuade, Patrick.

Diamond :An Experimental Determination of Diamond Nucleation, Nuclear Magnetic Resonance Spectroscopy of Diamondoids, and Development of a Novel Technique for Color Center Fabrication. - 1 online resource (103 pages)

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

Thesis (Ph.D.)--Stanford University, 2023.

Includes bibliographical references

Diamond is a well-known and useful material that has a large range of applications. Most common uses of diamond are based off its high strength, hardness, and toughness resulting from its chemical structure. However, with the development of diamond nanotechnologies and further understanding of the material, more applications have emerged such as diamond-based electronics, biolabeling, magnetic sensing, and quantum computing. By further understanding and developing the materials properties of diamonds at the nanoscale, the usefulness of diamond can be even further expanded.In the first section, I focus on the nucleation of diamond during chemical vapor deposition (CVD). CVD is a powerful technique for growing high-quality and high-purity diamond films and nanoparticles. Using diamondoids, which are diamond molecules of known shape and size that are part of the diamond lattice, CVD growths were seeded with atomistically defined precursors. From the resultant density of nanoparticles, the nucleation landscape of diamond CVD was experimentally determined. The determined critical nucleus size and interfacial energy for diamond was orders of magnitude lower than prior bulk estimations, indicating possible metastable states and multistep nucleation pathways.The next section utilizes nuclear magnetic resonance (NMR) spectroscopy to further examine a specific diamondoid molecule - pentamantane. Three pentamantane isomers were studied using 1D and 2D NMR to explore the electronic structure of pentamantane and intermolecular interactions that exist. Through these NMR results, connections are made to the (111) diamond surface and the reduction activity of hydrogen atoms. The presence of steric clashes in pentamantane could yield insights into the effect of defects on the diamond surface and how to utilize surface engineering to enhance diamond surface applications.The last section details a novel technique developed for the creation of nitrogen-vacancy (NV) centers in diamond substrates. NV centers are photoluminescent defects in the diamond lattice whose spin properties also allow for its use in magnetic sensing and quantum computing. Current fabrication methods rely on high-energy ion irradiation which damages the host lattice and leaves carbon interstitials which can degrade the quality of optical defects. The novel process developed uses metal vacancy-injection (VI) films to drive out carbon atoms from the diamond lattice through the formation of a metal carbide at the diamond/metal interface. The ability to pattern enhance fluorescence through the patterning of VI films through standard photolithographic techniques also allows for easy scale-up of this method.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798382635576Subjects--Topical Terms:

677040
Transmission electron microscopy.
Index Terms--Genre/Form:

554714
Electronic books.

Diamond : = An Experimental Determination of Diamond Nucleation, Nuclear Magnetic Resonance Spectroscopy of Diamondoids, and Development of a Novel Technique for Color Center Fabrication.
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500 $a Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
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504 $a Includes bibliographical references
520 $a Diamond is a well-known and useful material that has a large range of applications. Most common uses of diamond are based off its high strength, hardness, and toughness resulting from its chemical structure. However, with the development of diamond nanotechnologies and further understanding of the material, more applications have emerged such as diamond-based electronics, biolabeling, magnetic sensing, and quantum computing. By further understanding and developing the materials properties of diamonds at the nanoscale, the usefulness of diamond can be even further expanded.In the first section, I focus on the nucleation of diamond during chemical vapor deposition (CVD). CVD is a powerful technique for growing high-quality and high-purity diamond films and nanoparticles. Using diamondoids, which are diamond molecules of known shape and size that are part of the diamond lattice, CVD growths were seeded with atomistically defined precursors. From the resultant density of nanoparticles, the nucleation landscape of diamond CVD was experimentally determined. The determined critical nucleus size and interfacial energy for diamond was orders of magnitude lower than prior bulk estimations, indicating possible metastable states and multistep nucleation pathways.The next section utilizes nuclear magnetic resonance (NMR) spectroscopy to further examine a specific diamondoid molecule - pentamantane. Three pentamantane isomers were studied using 1D and 2D NMR to explore the electronic structure of pentamantane and intermolecular interactions that exist. Through these NMR results, connections are made to the (111) diamond surface and the reduction activity of hydrogen atoms. The presence of steric clashes in pentamantane could yield insights into the effect of defects on the diamond surface and how to utilize surface engineering to enhance diamond surface applications.The last section details a novel technique developed for the creation of nitrogen-vacancy (NV) centers in diamond substrates. NV centers are photoluminescent defects in the diamond lattice whose spin properties also allow for its use in magnetic sensing and quantum computing. Current fabrication methods rely on high-energy ion irradiation which damages the host lattice and leaves carbon interstitials which can degrade the quality of optical defects. The novel process developed uses metal vacancy-injection (VI) films to drive out carbon atoms from the diamond lattice through the formation of a metal carbide at the diamond/metal interface. The ability to pattern enhance fluorescence through the patterning of VI films through standard photolithographic techniques also allows for easy scale-up of this method.
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