The effect of pressure on the properties of carbon-based nanomaterials
Abstract/Contents
- Abstract
- High pressure, which can dramatically decrease the atomic volume and increase the electronic density of potential reactants, could result in novel and special chemical reactivity and reaction mechanisms. Thanks to the development of various pressure devices and probing technology, high-pressure research has been rapidly advancing over the past several decades. High pressure studies have greatly enhanced our understanding in a number of scientific fields, such as condensed matter physics, solid state chemistry, materials science, and Earth and planetary sciences. Carbon forms a variety of stable and metastable phases with exceptional physical and chemical properties. Carbon and carbon-based materials have attracted significant interest due to their unique properties. This dissertation focuses on how pressure affects material's bonding and electronic properties, particularly in a series of carbon based nanomaterials called diamondoid and its functionalized derivatives. Diamondoid molecules are ultra stable, saturated hydrocarbons consisting of fused carbon cages superimposed on the diamond lattice and were originally found in petroleum. The exceptional electron photoemission from thin film of diamondoids has excited interest in using these unique materials as functional elements to regulate energy flow at the nanoscale. Selective chemical functionalizations further change the electronic properties of the system and bring many more possible applications. Before the reader delves into more specific topics which are described later, chapter 1 aims to explain several fundamental, but extremely important concepts in high pressure science. Chapter 2 then discusses the laboratory devices used to produce pressure, addressing the issue of hydrostaticity. In chapters 3, 4 and 5, I will discuss our discoveries on how pressure affects pure diamondoids. We found most of them underwent pressure induced phase transition easily and that some of the phase transitions are extremely sensitive to the deviatoric stress. We also found that the compressibility of pure diamondoid crystals has a strong correlation with diamondoid molecular geometry. Our collaborator in the Department of Materials Science and Engineering has successfully synthesized a serious of metal organic chalcogenide (MOCs) with different molecular geometries based on diamondoids and their structural analogs. They all have core-shell structures with metal chalcogenide in the core and organic molecules as shells which form the nanowires structures. In chapter 6, I will discuss our observations of steric-controlled pressure driven chemical reactions in these compounds which represent an example of the rarely reported mechanochemistry process.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2017 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Yang, Fan |
|---|---|
| Associated with | Stanford University, Department of Geological Sciences. |
| Primary advisor | Mao, Wendy (Wendy Li-wen) |
| Thesis advisor | Mao, Wendy (Wendy Li-wen) |
| Thesis advisor | Melosh, Nicholas A |
| Thesis advisor | Reed, Evan J |
| Thesis advisor | Stebbins, Jonathan |
| Advisor | Melosh, Nicholas A |
| Advisor | Reed, Evan J |
| Advisor | Stebbins, Jonathan |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Fan Yang. |
|---|---|
| Note | Submitted to the Department of Geological Sciences. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2017. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2017 by Fan Yang
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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