Organothiol manipulation of copper for advanced electronics
Abstract/Contents
- Abstract
- Organothiol manipulation of inorganic conductive materials like copper provides a powerful synthetic route towards low-dimensional technologically important materials with atomically well-defined structures. Two examples from my research are presented in this thesis dissertation to demonstrate how organothiol chemistry can be leveraged to manipulate copper for a two-dimensional (2D) interface and for a one-dimensional (1D) nanowire construct for advanced electronics. In the first example, the application of a hybrid layer containing organothiol at a 2D copper surface is demonstrated in which the hybrid layer manipulates the surface copper-oxide. The presence of defective copper-oxide remains a challenge for device technologies owing to its detrimental effects on the adhesion and stress-migration. Here we show a rapid, single-step, and organic-solvent-free thin-film deposition process that is capable of simultaneously reducing the weak copper-oxide while forming a densely connected copper/hybrid interface. A marked 9-fold improvement in interfacial adhesion is reported, along with a substantially suppressed copper stress-migration behavior during in-situ isothermal stress-relaxation experiments. The enhanced copper/hybrid interfacial adhesion and the improved copper stress-migration performance are attributed to the partial reduction of the ∼2 nm native Cu2O layer as demonstrated via atomic-resolution transmission electron microscopy. The hybrid-layer strategy we developed is expected to be effective in not only being a promising candidate for adhesion improvement to copper, but in promoting copper stress- and the related electro-migration performance. In the second example, I demonstrate the synthesis of 1D core-shell nanowires that have electrically conductive inorganic cores and insulating organic shells. Core-shell nanowires are synthesized via a facile solution process, leveraging the strong chemical interaction between organothiol molecular precursors and copper. Electronic properties of nanowires are characterized via electrochemical impedance spectroscopy, and elemental compositions are determined via x-ray photoelectron spectroscopy. Atomic arrangements inside the core-shell nanowires are unraveled via high-resolution x-ray diffraction in conjunction with molecular dynamic and density functional theory computations. Transmission electron microscopy provides a glimpse into the core-shell nanowire structure. We demonstrate, via this combinatorial approach, the exact atomic arrangement inside ultrathin nanowires comprising of only 5 inorganic atoms in the cross-section. The nanowires' unique electronic properties and our complete understanding of their atomically well-defined structures make them promising candidates for use in the next generation advanced electronics which are constantly seeking conductive features of diminishingly small size.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Xiao, Qiran |
|---|---|
| Associated with | Stanford University, Department of Materials Science and Engineering. |
| Primary advisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | Melosh, Nicholas A |
| Thesis advisor | Salleo, Alberto |
| Advisor | Melosh, Nicholas A |
| Advisor | Salleo, Alberto |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Qiran Xiao. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Qiran Xiao
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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