Electrons in quantum confined nanoparticle assemblies
Abstract/Contents
- Abstract
- Electrostatic capacitors have wide applications in energy storage and power quality management. Compared to electrochemical batteries, they offer higher power densities and superior cycling performances as neither chemical bond formation nor ion transport processes are involved in these devices. Nevertheless, their energy densities need to be improved. One possible way is to replace conventional metallic electrodes by nanoparticle electrodes with respectful electron conductivity and discrete energy levels in the conduction band. Electronic structures of individual quantum dots of the same material can be modified by their sizes. The degree of symmetry loss and surface/volume atom ratio affect the degree of differences in energy levels from those of their bulk form. Mediated by capping ligands, similar-sized colloidal quantum dots can self-assemble into superlattice films or solids. When quantum dots are assembled into monolayers at the water-air interface by Langmuir-Blodgett method, density of dislocations can be reduced by providing mechanical perturbations that facilitate thermal equilibrium. Electronic structures of quantum dot assemblies can be affected by interparticle spacing, sizes, and size variation. They change the degree of electronic coupling, which is in the form of electron wavefunction extension between quantum dots. Electron mobility can be estimated according to the electronic structures of the quantum dot assemblies, and high electron mobility are associated with monodisperse quantum dots with short ligands. Improved capacitance are obtained on capacitors where quantum dots are incorporated. It is possibly attributed to enlarged surface area of quantum dot arrays. Evidence on breakdown voltage improvement suggest potential of storing charges with higher energy density.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2016 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Xu, Shicheng (John) |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Primary advisor | Prinz, F. B |
| Thesis advisor | Prinz, F. B |
| Thesis advisor | Salleo, Alberto |
| Thesis advisor | Zheng, Xiaolin, 1978- |
| Advisor | Salleo, Alberto |
| Advisor | Zheng, Xiaolin, 1978- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Shicheng Xu. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Shicheng Xu
- License
- This work is licensed under a Creative Commons Attribution Non Commercial No Derivatives 3.0 Unported license (CC BY-NC-ND).
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