Understanding the interaction of organic functional groups with single-walled carbon nanotubes (SWNTS) for solution processable electronics
- Single-walled carbon nanotubes (SWNTs) have shown impressive electrical properties but are synthesized in mixtures of metallic and semiconducting tubes that prove difficult to separate. However, we have recently discovered that different organic functional groups, when confined to surfaces, can efficiently separate SWNTs. Amine surfaces yield semiconducting (sc) nanotube networks, while aromatic surfaces yield metallic (met) networks. It is proposed that aromatics interact preferably with met-CNTs via [pi]-[pi] stacking, but the effect on the amine surface is more difficult to interpret. Explanations for this interaction include charge polarization, electrostatic forces, or the influence of defect sites. In my presentation, I present a series of experiments used to elucidate the exact nature of the amine / sc-SWNT interaction. The electrostatic influence on the amine-SWNT interaction was studied by altering the pH of the environment around the amine. Subsequently, by altering the density of the amine on the surface, the ideal structure of an amine surface to optimize the SWNT sorting was under analysis. Finally, alternate functional groups were considered to further optimize the sorting and remove the need of amine silanes, which were typically difficult to handle. Once the interaction is better understood, it can be controlled and used to optimize conditions for high quality nanotube network transistors and sensors.
|Type of resource
|electronic; electronic resource; remote
|1 online resource.
|Opatkiewicz, Justin Paul
|Stanford University, Department of Chemical Engineering
|Fuller, Gerald G
|Fuller, Gerald G
|Statement of responsibility
|Justin P. Opatkiewicz.
|Submitted to the Department of Chemical Engineering.
|Thesis (Ph.D.)--Stanford University, 2012.
- © 2012 by Justin Paul Opatkiewicz
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Also listed in
Loading usage metrics...