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研究生: 龍友翰
Jan Sebastian Dominic Rodriguez
論文名稱: Nanoscale Investigation of the Mechanical and Electrical Properties of Polyaniline/Graphene Oxide Composite thin Films Fabricated by Physical Mixture Method
Nanoscale Investigation of the Mechanical and Electrical Properties of Polyaniline/Graphene Oxide Composite thin Films Fabricated by Physical Mixture Method
指導教授: 邱顯智
Chiu, Hsiang-Chih
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2020
畢業學年度: 108
語文別: 英文
論文頁數: 48
中文關鍵詞: 原子力顯微鏡聚苯胺氧化石墨烯超級電容
英文關鍵詞: Atomic Force Microscopy, Polyaniline, Graphene Oxide, Supercapacitor
DOI URL: http://doi.org/10.6345/NTNU202000007
論文種類: 學術論文
相關次數: 點閱:205下載:0
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    Polyaniline (PANI), owing to its excellent electrochemical performance and ease of synthesis, has been a prominent material in applications concerning the optimization of supercapacitors. However, PANI suffers poor electrochemical stabilities and low cycle life, due to swelling and shrinking of the polymer backbone when subjected to continuous charge/discharge processes. Consequently, efforts have been made to address the agglomeration of PANI fibers, such as physically stretching the solution. Graphene oxide (GO), on the other hand, is a single layer of graphite with the presence of various oxygen-containing functional groups attached. Coupled with its excellent structural and mechanical properties that it inherits from graphene, the oxygen-containing functional groups in GO provide advantageous conditions that are favorable for its composite with polymers, such as PANI. Typically, PANI/GO nanocomposites are fabricated using electrochemical and in situ chemical oxidative polymerization methods, but a recent work has proposed a simple physical method
    to mix PANI and GO. Considering its high surface-to-volume ratio, GO can intercalate within the PANI fiber structure during physical mixture. Thus, the addition of GO might aid in reducing the agglomeration, while enhancing the electrical and mechanical properties of PANI.
    Our work focuses on probing the effect of GO on the nanoscale electrical and mechanical properties when composited with PANI, with the use of PeakForce Tunneling Atomic Force Microscopy (PF-TUNA). Our results may provide further understanding on the synergistic contributions of PANI and GO when composited with each other, for the applications in supercapacitor research.

    1. Introduction 1 2. Atomic Force Microscopy (AFM) 5 2.1 Historical background 5 2.2 AFM working principle 5 2.3 Force-distance curves 7 2.4 Fundamental Modes of AFM 8 2.4.1 Contact Mode 8 2.4.2 Tapping Mode 8 2.4.3 Non-contact Mode 9 2.5 Calibration of the Cantilever Spring Constant 9 2.6 PeakForce Tapping Mode 12 2.7 Local Property Mapping 14 2.7.1 Contact Mechanics for Nanoscale Mechanical Property Modeling 14 2.7.2 PeakForce Quantitative Nano-mechanical property Mapping (PF-QNM) 16 2.7.3 PeakForce Tunneling AFM (PF-TUNA) 17 3. Electrochemical Processes in Energy Storage Devices 19 3.1 Energy Storage Mechanism of Batteries 19 3.2 Charge Storage Processes in Supercapacitors 20 3.2.1 Electric Double Layer Capacitance (EDLC) 20 3.2.2 Pseudocapacitance 22 3.3 Electrochemical Performance Characterization Techniques 23 3.3.1 Three-Electrode System 23 3.3.2 Cyclic Voltammetry 25 3.3.3 Galvanostatic Charge-Discharge (GCD) measurements 27 4. Experimental Methods 28 4.1 Sample Preparation 28 4.2 Contact Angle Measurements 29 4.3 Scanning Electron Microscopy 30 4.4 AFM set-up 31 4.5 Electrochemical Measurements 32 5. Results 34 5.1 SEM observation 34 5.2 Wettability of PANI-GO films vs. Stir time 36 5.3 Nanoscale measurements using AFM 37 5.3.1 Graphene oxide (GO) flake size 37 5.3.2 Topography vs. Stir time 38 5.3.3 Topography, Adhesion, and TUNA current maps 39 5.3.4 Elastic modulus vs. Stir time 40 5.4 Electrochemical Performance 43 6. Conclusion 45 References 46

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