Characterizations and Applications of Zinc Oxide/Carbon Nanotubes Devices Using Microwave Plasma Jet Chemical Vapor Deposition System
| Autor: | Chia-Min Huang, 黃加閔 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 In the past, many studies have investigated the field emission properties of CNTs and ZnO nanostructures. In the present study, we fabricated CNT-ZnO composite films by Microwave Plasma Jet Chemical Vapor Deposition System (MPJCVD), where CNT-ZnO was expected to be a supporting matrix. The control system operates of MPJCVD in a real-time environment, dynamic data exchange and recording, networking, and multitasking capabilities.High Frequency Structure Simulator（HFSS）software was used to calculate electrical fields around specimen under different geometrical control of E-H tuner of MPJVCD. The simulated results were compared to plasma images, from camera and to plasma spectrum. SEM, EDS, and XRD were used to examine the morphology, composition, phase structure and crystallinity of ZnO films. Via calculating the electrostatic field distribution, it was found that this giant enhancement of FE performance is due to the typical general CNTs, ZnO nanowires and ZnO-CNT composite. The turn-on field of an emission device constructed with the ZnO-CNT composite was 0.31 V μm−1, which was lower than that of the common CNT and ZnO. As the results of field emission tests, the CNTs on ZnO films could be a useful material in the emission applications.Electrochemical characterization by galvanostatic discharge/charge tests demonstrate that the conversion reactions in ZnO/CNT electrodes enable reversible capacity of 188 Fg-1. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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