Title Page
Contents
Abstract 12
Chapter 1. Introduction 13
1.1. Study Background 13
1.1.1. Electromagnetic shielding materials 13
1.1.2. Cellulose as a carbon material 14
1.1.3. Carbon materials as fillers 15
1.2. Research Objective 17
Chapter 2. Electromagnetic Interference Shielding Application of WC/GnP carbon papers 18
2.1. Materials and Methods 18
2.1.1. Materials 18
2.1.2. Preparation of WC/GnP papers and their carbon papers 18
2.1.3. Analysis of WC/GnP carbon papers 19
2.2. Results and Discussion 21
2.2.1. Electrical conductivity 21
2.2.2. Electromagnetic shielding effectiveness 24
2.2.3. X-ray diffraction 29
2.2.4. Raman analysis 33
2.2.5. Tensile strength 37
2.2.6. SEM 39
2.3. Summary 41
Chapter 3. Electromagnetic Interference Shielding Application of TC/CNT carbon papers 42
3.1. Materials and Methods of TC/CNT carbon papers 42
3.1.1. Materials 42
3.1.2. Preparation of TC/CNT papers and their carbon papers 42
3.1.3. Analysis of TC/CNT carbon papers 43
3.2. Results of TC/CNT carbon paper 44
3.2.1. Electrical conductivity 44
3.2.2. Electromagnetic shielding effectiveness 47
3.2.3. X-ray diffraction 51
3.2.4. Raman analysis 55
3.2.5. Tensile strength 59
3.2.6. SEM 61
3.3. Summary 63
Chapter 4. Conclusions 64
References 66
국문초록 72
Table 1. Ratio of graphitic to defect structures in WC/GnP carbon papers (i.e., ratio of heights of D and G peaks in Figure 12, 13, and 14). 33
Table 2. Ratio of graphitic to defect structures in TC/CNT carbon papers (i.e., ratio of heights of D and G peaks in Figure 28, 29, and 30). 55
Figure 1. Process for the extraction of cellulose fibers from waste wood and the preparation of waste wood cellulose fiber/graphene nanoplatelet (WC/GnP)... 19
Figure 2. Electrical conductivity of one sheet of WC/GnP carbon paper produced at various carbonization temperatures and GnP content. 22
Figure 3. Electrical conductivity of two sheets of WC/GnP carbon papers produced at various carbonization temperatures and GnP content. 22
Figure 4. Electrical conductivity of three sheets of WC/GnP carbon papers produced at various carbonization temperatures and GnP content. 23
Figure 5. Electromagnetic interference shielding mechanism of the carbon paper. 25
Figure 6. Electromagnetic interference shielding effectiveness (EMI SE) of WC/GnP-5 carbon papers prepared at various carbonization temperatures: one... 26
Figure 7. EMI SE of WC/GnP-10 carbon papers prepared at various carbonization temperatures: one sheet (a), two sheets (b), and three sheets (c). 27
Figure 8. EMI SE of WC/GnP-15 carbon papers prepared at various carbonization temperatures: one sheet (a), two sheets (b), and three sheets (c). 28
Figure 9. X-ray diffraction profiles of WC/GnP-5 carbon papers produced at various carbonization temperatures. 30
Figure 10. X-ray diffraction profiles of WC/GnP-10 carbon papers produced at various carbonization temperatures. 31
Figure 11. X-ray diffraction profiles of WC/GnP-15 carbon papers produced at various carbonization temperatures. 32
Figure 12. Raman spectra of WC/GnP-5 carbon papers prepared at various carbonization temperatures. 34
Figure 13. Raman spectra of WC/GnP-10 carbon papers prepared at various carbonization temperatures. 35
Figure 14. Raman spectra of WC/GnP-15 carbon papers prepared at various carbonization temperatures. 36
Figure 15. Tensile strengths of WC/GnP carbon papers prepared with varying GnP contents and carbonization temperatures. 37
Figure 16. Photographs of wound (a) and bent (b) WC/GnP carbon paper. 38
Figure 17. SEM images of WC/GnP paper with various cellulose and GnP contents. 40
Figure 18. Process for the extraction of cellulose fibers from tall goldenrods and the preparation of tall goldenrods/carbon nanotubes (TC/CNT) carbon papers. 43
Figure 19. Electrical conductivity of one sheet of TC/CNT carbon paper produced at various carbonization temperatures and CNT content. 45
Figure 20. Electrical conductivity of two sheets of TC/CNT carbon papers produced at various carbonization temperatures and CNT content. 45
Figure 21. Electrical conductivity of three sheets of TC/CNT carbon papers produced at various carbonization temperatures and CNT content. 46
Figure 22. EMI SE of TC/CNT-5 carbon papers prepared at various carbonization temperatures: one sheet (a), two sheets (b), and three sheets (c). 48
Figure 23. EMI SE of TC/CNT-10 carbon papers prepared at various carbonization temperatures: one sheet (a), two sheets (b), and three sheets (c). 49
Figure 24. EMI SE of TC/CNT-15 carbon papers prepared at various carbonization temperatures: one sheet (a), two sheets (b), and three sheets (c). 50
Figure 25. X-ray diffraction profiles of TC/CNT-5 carbon papers produced at various carbonization temperatures. 52
Figure 26. X-ray diffraction profiles of TC/CNT-10 carbon papers produced at various carbonization temperatures. 53
Figure 27. X-ray diffraction profiles of TC/CNT-15 carbon papers produced at various carbonization temperatures. 54
Figure 28. Raman spectra of TC/CNT-5 carbon papers prepared at various carbonization temperature. 56
Figure 29. Raman spectra of TC/CNT-10 carbon papers prepared at various carbonization temperature. 57
Figure 30. Raman spectra of TC/CNT-15 carbon papers prepared at various carbonization temperature. 58
Figure 31. Tensile strengths of TC/CNT carbon papers prepared with varying CNT contents and carbonization temperatures. 59
Figure 32. Photographs of wound (a) and bent (b) TC/CNT carbon paper. 60
Figure 33. SEM images of TC/CNT paper with various cellulose and CNT contents. 62