Wang, Zhijie
(2022)
Diamond Surface Structuring via Carbon Transport at Diamond-Transition Metal Interfaces.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
This is the latest version of this item.
Abstract
Diamond is a kind of promising material with many unique properties that can be used in many fields. However, the extreme high hardness makes diamond surface manufacturing difficult and limits its application. In this research, a novel diamond surface manufacturing technique that based on the thermomechanically induced mass transport at diamond and transition metal interface are introduced. First, thermally induced mass transport between diamond and FeCoB, Fe, Co, or Ni were investigated. The transition metal thin films were selectively deposited on diamond surface through masks fabricated by photolithography and nanosphere lithography. The structures of interaction interfaces were characterized by SEM, XRD, Raman Spectroscopy, and TEM. The surface topographies corresponding to each treatment step were characterized by optical profilometer and AFM. The mechanism to illustrate the diffusional interaction between diamond and different transition metals was firstly presented based on the characterization results. The role of the transition metal-diamond interface is key to controlling the material removal; the stability of the interface determines the ability to faithfully replicate the ultrafine features that were patterned by transition metals.
Second, purely mechanically induced mass transport between diamond and transition metals are investigated using transition metal thin film deposited AFM tip scratching and in-situ TEM scratching test. Due to the weak strength of the transition metal - diamond joints and transition metal thin films, AFM scratching rarely activated the mass transport interaction at the diamond – transition metal thin film interfaces. The in-situ TEM scratching tests were performed using a Nanofactory STM holder. The interaction at diamond and W interface was successfully activated by nanoscale in-situ scratching under room temperature. The lattice structure of diamond and W were characterized by HRTEM. The stress to activate the interaction was estimated by measuring the interplanar spacing change of W nanotips before scratching and at the frame that the interaction was activated.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
6 September 2022 |
| Date Type: |
Publication |
| Defense Date: |
6 July 2022 |
| Approval Date: |
6 September 2022 |
| Submission Date: |
18 July 2022 |
| Access Restriction: |
2 year -- Restrict access to University of Pittsburgh for a period of 2 years. |
| Number of Pages: |
135 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Industrial Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Diamond, Transition metal, Diffusion, Surface structuring |
| Date Deposited: |
06 Sep 2022 16:22 |
| Last Modified: |
06 Sep 2024 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/43329 |
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Diamond Surface Structuring via Carbon Transport at Diamond-Transition Metal Interfaces. (deposited 06 Sep 2022 16:22)
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