Title Page
Contents
ABSTRACT 7
Ⅰ. Introduction 15
Ⅱ. Main subjects 18
Part.1. Electronic properties of single-layer graphene decorated with silver nanoparticles(AgNPs) via photoreduction (PR) process 18
1.1. Theoretical background 18
1.2. Experimental methods 20
1.3. Results and discussion 27
Part.2. Electrochemical properties of graphene nanoplatelets-supported AgNP electrodes via PR process 52
2.1. Theoretical background 52
2.2. Experimental methods 55
2.3. Results and discussion 56
Ⅲ. Summary and Conclusion 59
Ⅵ. References 61
Abstract in Korean 69
Figure 1. (a) Schematic diagram and (b) energy band diagram of the photoreduction (PR) process of silver nanoparticles (AgNPs) on... 17
Figure 2. SEM images of AgNPs/GF prepared by a single point laser scan under focused-laser irradiation conditions of (a) 2 mW and 500... 21
Figure 3. Representative images of AgNPs grown selectively on a GF taken by (a) OM and (b) SEM, respectively. The area marked in the... 24
Figure 4. Energy-dispersive X-ray spectroscopy (EDS) elemental mappings of AgNPs grown on a GF by the PR process. (a) EDS... 25
Figure 5. Representative OM images of AgNPs grown on a GF selectively in the area of 50 × 50 μm² through the PR process under... 28
Figure 6. Representative SEM images captured from the regions of AgNPs/GF prepared by the PR process under various laser conditions.... 30
Figure 7. Morphology characteristics of AgNPs grown on a GF at varying laser parameters. The plots (a) and (b) show the values of... 32
Figure 8. (a) schematic side-view diagram of the GFET device with AgNPs on the GC surface. Plan-view OM images are presented: (b)... 36
Figure 9. SEM images showing selective regions of AgNP-decorated GCs. (a, b) were obtained through the PR process using a PL of 5...[이미지참조] 37
Figure 10. (a) The θ and (b) the α of AgNPs grown on GFs and GCs are plotted as a function of PL at τL of 500 ms and 2000 ms. (c) The...[이미지참조] 38
Figure 11. (a) Idrain vs. VG curves measured at VDS=10 mV for GFETs with and without AgNP decoration, prepared at PL of 5 mW...[이미지참조] 41
Figure 12. The two-step process composed of laser-irradiation treatment in water and PR-induced AgNP growth. (a) An OM plan-... 46
Figure 13. Variations in GFET device characteristics during the two-step process. (a) Sequential measurements of Idrain vs. VG curves...[이미지참조] 51
Figure 14. (a) Cyclic voltammetry of three AgNP/GNPs electrodes with different laser scan cycles in O₂-purged 1 M KOH solutions. (b)... 58