臺灣博碩士論文加值系統

在當今技術先進的時代，具有高介電常數和損耗角正切的材料已被廣泛研究用於許多應用，包括儲能設備、微電子設備等。由於其柔韌性和高強度，具有柔性特性的聚合物複合材料的開發已經 引起了極大的關注。 本研究旨在調查和評估含有氧化石墨烯、鋯和這些填料組合的 PVDF 複合聚合物 樣品的介電性能。

在這項研究中，氧化石墨烯 (GO) 被稱為二維碳基材料（主要是石墨烯)，由於其獨特的特性，被認為是改善 PVDF 基材料壓電性能最重要的納米填料結構之一。 sp2 雜化“C”原子的存在提高了載流子的遷移率和導電率。它們的表面積和重量輕有助於形成具有出色傳導損耗的傳導網絡。

此外，ZrO2 以其高熱機械性能、透光性、耐化學性和耐腐蝕性、高熱膨脹係數和低導熱性而著稱。 在這項研究中，可以認為它像氧化石墨烯一樣影響 PVDF 的介電性能。

除了影響每種單獨填料的介電性能外，這兩種填料以不同比例組合會產生值得參考的研究結果。 根據這項研究發現，具有較高氧化石墨烯含量和較低鋯填料含量的樣品將形成可以允許電子遷移和跳躍的導電網路來改善上述複合材料的整體性能，從而顯著提高導電性和 介電特性。

In today's technologically advanced era, materials with a high dielectric constant and loss tangent have been extensively investigated for numerous applications, including energy storage devices, microelectronics devices, etc. Due to their flexibility and high strength, the development of polymer composites with flexible properties has garnered a great deal of attention. This study aims to look into and measure the dielectric properties of PVDF composite polymer samples with graphene oxide, zirconia, and these filler combinations.

In this research, graphene oxide (GO), which is known as a two-dimensional carbon-based material (primarily graphene), is regarded as one of the most essential fillers for improving the piezoelectric performance of PVDF-based materials due to its unique structure. The presence of the sp2 hybridized "C" atom improves the mobility and conductivity of the carriers. Their large specific surface area and lightweight encourage the creation of conductive networks with excellent conduction loss.
Besides, zirconia (ZrO2) is known for its high thermomechanical properties, optical transparency, chemical and corrosion resistance, high coefficient of thermal expansion, and low thermal conductivity. In this research, it can be considered to affect the dielectric property of PVDF like Graphene oxide.

In addition to affecting the dielectric properties of each individual filler, the combination of these two fillers in varying proportions yields research results that are worthy of consideration. According to the findings of this study, samples with a higher graphene oxide content and a lower zirconia filler content will improve the overall performance of the aforementioned composites by forming conductive networks that permit electron migration and hopping, resulting in a substantial increase in electrical conductivity and dielectric value.

摘要 .............................................................................................................................................i
Abstract ....................................................................................................................................iii
Acknowledgments.....................................................................................................................v
Contents....................................................................................................................................vi
List of Tables..........................................................................................................................viii
List of Figures ..........................................................................................................................ix
Symbol Description..................................................................................................................xi
Chapter 1 Introduction ............................................................................................................1
1.1 . General........................................................................................................................1
1.2 . Dielectric Materials....................................................................................................2
1.3 . Capacitor Dielectric....................................................................................................2
1.4 . PVDF ..........................................................................................................................4
1.4.1 . General.............................................................................................................4
1.4.2. Phase transition methods..................................................................................7
1.5. Graphene oxide............................................................................................................9
1.6. Graphite .....................................................................................................................10
1.7. Graphene....................................................................................................................12
1.8. Zirconium Oxide........................................................................................................14
Chapter 2 Literature review..................................................................................................15
2.1. Dielectric polarization................................................................................................15
2.2. Polarization and relaxation of dielectric materials ....................................................16
2.3. Theoretical models for dielectric properties of polymer–matrix composites............18
2.4. High dielectric constant and low loss tendencies......................................................21
2.4.1. Various Types of Polarization and Loss Mechanisms in Polymers................21
2.4.2. Interfacial Polarization in Polymer Composite Dielectrics............................23
2.5. Dielectric characteristics............................................................................................24
2.5.1. Capacitance.....................................................................................................24
2.5.2. Dielectric constant..........................................................................................25
2.5.3. Dielectric frequency .......................................................................................26
2.5.4. Dissipation factor............................................................................................27
Chapter 3 Experiment and Equipments...............................................................................28
vii
3.1 . Chemicals.................................................................................................................28
3.1.1. PVDF ..............................................................................................................28
3.1.2. Zirconia...........................................................................................................28
3.1.3. NMP................................................................................................................29
3.1.4. Graphene oxide...............................................................................................29
3.2. Equipments................................................................................................................30
3.2.1. Scanning Electron Microscope (SEM)...........................................................30
3.2.2. X-ray Diffraction (XRD) ................................................................................30
3.2.3. LCR – Meter...................................................................................................32
3.2.4. Raman spectroscopy .......................................................................................32
3.3. Experimental methods...............................................................................................33
3.1.1 . Preparation of Graphene oxide ......................................................................33
3.1.2 . Preparation of PVDF film sample .................................................................35
3.1.3 . Preparation of Graphene oxide/PVDF film sample.......................................36
3.1.4 . Preparation of Graphene oxide-Zirconia/PVDF film samples......................37
Chapter 4 . Results and Discussion .......................................................................................38
4.1 . Graphene oxide.........................................................................................................38
4.2 . Dielectric constant and loss tangent .........................................................................42
4.3 . SEM analysis............................................................................................................42
4.4. XRD...........................................................................................................................42
4.5. Raman spectroscopy..................................................................................................50
Chapter 5 . Conclusions and Future work ...........................................................................70
5.1 . Conclusions ..............................................................................................................70
5.2 . Future work...............................................................................................................71
References................................................................................................................................72
Extended Abstract ..................................................................................................................77

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