표제지
(국문초록)
목차
Chapter I. 다양한 pH 조건에서 합성된 ZnS/MPA, CdS/MPA 양자점의 특성 및 Escherichia coli 성장에 미치는 영향 14
I. 서론 14
1. 나노의 역사 및 미래 14
2. 반도체 나노입자 (semiconductor nanocrystals) & 양자점 (QDs) 15
3. 양자점 합성 17
II. 실험 20
1. 시약 20
2. 측정기기 21
3. 실험방법 22
III. 결과 및 고찰 25
IV. 결론 40
Chapter II. Undoped, Cu, Mn으로 도핑된 ZnS/MPA 양자점의 특성 및 백색발광 41
I. 서론 41
1. 백색 형광체 합성 41
2. 형광 메카니즘 42
II. 실험 44
1. 시약 44
2. 측정기기 45
3. 실험방법 46
III. 결과 및 고찰 49
IV. 결론 59
Chapter III. 2가지 방법을 이용한 수용성 ZnS:Mn/EDTA 양자점의 나노결정합성 60
I. 서론 60
1. 수용성 나노결정 합성 60
II. 실험 62
1. 시약 62
2. 측정기기 63
3. 실험방법 64
III. 결과 및 고찰 65
IV. 결론 74
참고문헌 75
(Abstract) 77
Table 1. Summary of experimental data of the ZnS/MPA quantum dots 37
Table 2. Summary of experimental data of the CdS/MPA quantum dots 37
Table 3. A table of organic dye literature quantum yield and emission range 48
Table 4. Summary of experimental data of ZnS:M (M=undoped, Cu, Mn)/MPA quantum dots 57
Table 5. Summary of experimental data of ZnS:Mn/EDTA quantum dots 73
Fig. 1.Density of states (Y-axis) functions plotted against energy (X-axis) for bulk (3 D), quantum well (2 D), quantum wire (1 D) and quantum dot (0 D). 18
Fig. 2. Dependence of a quantum-sized semiconductor's band gap on particle size. 19
Fig. 3. 4 step of E. coli growth curve. First step is lag phase (ready), second step is exponential phase (growth), third step is stationary phase (retain), and final step is death phase (decrease). 24
Fig. 4. Measurement method of cytotoxicity. 24
Fig. 5. UV/Vis absorption spectra of (a) ZnS/MPA quantum dots, and (b) CdS/MPA quantum dots synthesized at various pH values 27
Fig. 6. Photoluminescence emission spectra of (a) ZnS/MPA quantum dots, and (b) CdS/MPA quantum dots synthesized at various pH values 28
Fig. 7. HR-TEM images of ZnS/MPA quantum dots 29
Fig. 8. HR-TEM images of CdS/MPA quantum dots 30
Fig. 9. EDXS spectra of ZnS/MPA, CdS/MPA quantum dots ; (a) ZnS/MPA (b) CdS/MPA 31
Fig. 10. XRD patterns of ZnS quantum dots and reference 32
Fig. 11. XRD patterns of CdS quantum dots and reference 33
Fig. 12. XRD broadening effect for quantum dot size. 34
Fig. 13. FT-IR spectrum of water-soluble ZnS/MPA (solid), 3-MPA (dash) 35
Fig. 14. FT-IR spectrum of water-soluble CdS/MPA (solid), 3-MPA (dash) 36
Fig. 15. Cytotoxicity effect of starting materials (a) ZnSO4, (b) CdSO4 on E. coli. 38
Fig. 16. Cytotoxicity effect of MPA coated (a) ZnS, (b) CdS quantum dots on E. coli. 39
Fig. 17. Various fluorescence mechanism 43
Fig. 18. Excitation spectra of (a) ZnS/MPA, (b) ZnS:Cu/MPA, (c) ZnS:Mn/MPA quantum dots 51
Fig. 19. PL emission spectra of (a) ZnS/MPA, (b) ZnS:Cu/MPA, (c) ZnS:Mn/MPA quantum dots 52
Fig. 20. HR-TEM images of (a) ZnS/MPA, (b) ZnS:Cu/MPA, (c) ZnS:Mn/MPA quantum dots 53
Fig. 21. EDXS spectra of (a) ZnS/MPA, (b) ZnS:Cu/MPA, (c) ZnS:Mn/MPA quantum dots 54
Fig. 22. XRD patterns of ZnS:M (M=undoped, Cu, Mn)/MPA quantum dots and reference 55
Fig. 23. FT-IR spectrum of water-soluble ZnS:M/MPA (solid) and ligand 3-MPA (dash) 56
Fig. 24. LASER light scattering images of (a) ZnS/MPA, (b) ZnS:Cu/MPA, (c) ZnS:Mn/MPA quantum dots 58
Fig. 25. CIE diagram and LASER light scattering image of mixing ZnS:M (M=undoped, Cu, Mn) quantum dots. By mixing ZnS:M (M=undoped, Cu, Mn) quantum dots, we obtained white photoluminescence. 58
Fig. 26. UV/Vis absorption spectra of (a) ZnS:Mn/EDTA method 1 (using wet-chemical method) and (b) ZnS:Mn/EDTA method 2 (using non-hydrolytic method) 67
Fig. 27. Photoluminescence emission spectra of (a) ZnS:Mn/EDTA method 1 (using wet-chemical method) and (b) ZnS:Mn/EDTA method 2 (using non-hydrolytic method) 68
Fig. 28. HR-TEM images of ZnS:Mn/EDTA 69
Fig. 29. EDXS spectra of (a) ZnS:Mn/EDTA (method 1) and (b) ZnS:Mn/EDTA (method 2) 70
Fig. 30. XRD patterns of ZnS:Mn/EDTA quantum dots and reference 71
Fig. 31. FT-IR spectrum of water-soluble ZnS:Mn/EDTA (dash), EDTA (solid) 72