Polymer-Nanoparticle Composites for the Advanced Plasmonic Applications
- Alternative Title
- 고분자-나노입자 복합체를 활용한 플라즈몬 응용 연구
- Abstract
- Nanomaterials have been developed for a wide range of applications including catalytic, energy, medicine, environmental remediation and sensing. Aiming at improving the performance in these multi-disciplinary fields researchers often work with metal nanoparticles, i.e. gold (Au) and silver (Ag) nanoparticles. Chapter 1 serves as an introduction to metal nanoparticles including their unique localized surface plasmon resonance properties and how these light-matter interactions can be utilized for emerging applications. Chapter 2 explained the detailed synthesis mechanism for preparing heterogeneous metal nanoparticle assemblies using the self-segregrating behavior of block copolymer micelles. The properties of the prepared assemblies were investigated with an emphasis on their inter- and intra-scattering properties which significantly enhanced the SERS enhancement factor. Chapter 3 describes the immobilization of Au NPs inside PES porous membrane to promote the plasmonic hybridization of NPs and induce scattering-mediated photothermal heating process for the catalytic application. In Chapter 4, we designed a superstructure nanoparticle assembly composed of Au core and Ag satellite by utilizing a mussel-inspired polydopamine. The influence of incident light on their catalytic performance was studied using xenon lamp with various wavelengths. The synergistic effect of Au and Ag inside the assemblies was found to be effective in enhancing their catalytic activity. Further, in Chapter 5, we prepared the porous-sulfonated polystyrene microspheres by swelling-osmosis process. Subsequently, the spherical Ag NPs were loaded onto the polymer surface by in-situ reduction route. The significant influence of porous polymeric structure on the catalytic activity of Ag NPs was studied. The prepare composite microspheres demonstrated good catalytic activity for the reduction of 4-nitrophenol. Lastly, in chapter 6, we prepared Ag NPs-containing hydrogel based on natural alginate polymers by using photo-crosslinking method. The antimicrobial activity of the resulting alginate hydrogels incorporate with Ag NPs was studied against E.coli and exhibited a significantly high antimicrobial potency.
- Issued Date
- 2021
- Awarded Date
- 2021. 8
- Type
- Dissertation
- Keyword
- nanoparticle plasmonic composites
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 고분자공학과
- Advisor
- 유성일
- Table Of Contents
- Chapter I. Introduction 1
I.1. Metal Nanoparticles 1
I.2. Localized Surface Plasmon Resonance 2
I.3. Plasmonic Coupling of Metal Nanoparticles 8
I.4. Applications of Metal Nanoparticles 12
I.4.1. Surface-enhanced Raman Scattering 12
I.4.2. Photocatalysis 18
I.4.3. Antimicrobial 20
I.5. Polymer-Nanoparticle Composites 21
I.5.1. In situ Synthesis Methods 23
I.5.2. Ex situ Synthesis Methods 24
I.6. References 25
Chapter II. Scattering-Mediated Absorption from Heterogeneous Nanoparticle Assemblies in Diblock Copolymer Micelles for SERS Enhancement 36
II.1. Introduction 36
II.2. Experimental Section 41
II.2.1. Materials 41
II.2.2. Synthesis of Gold Nanoparticles 42
II.2.3. Surface Modification of Gold Nanoparticles 42
II.2.4. Encapsulation of Au NPs inside PS−PAA core 43
II.2.5. Preparation of Heterogeneous Metal Nanoparticle Assemblies 44
II.2.6. Synthesis of Citrate-coated Ag NPs 45
II.2.7. Characterization 45
II.3. Result and Discussion 46
II.3.1. Synthesis and Characterization of Heterogeneous Metal Nanoparticles 46
II.3.2. Surface-enhanced Raman Scattering (SERS) Properties of the Micellar NP Assemblies 58
II.3.3. SERS Enhancement Mechanism 66
II.3.4. Effect of Au NPs size on SERS enhancement 81
II.4. Conclusion 87
II.5. References 88
Chapter III. Scattering-mediated Photothermal Heating in Plasmonic PES/Au Membranes for Heterogeneous Catalysis 101
III.1. Introduction 101
III.2. Experimental Section 106
III.2.1. Materials 106
III.2.2. Synthesis of Gold Nanoparticles 106
III.2.3. Preparation of PES/Au Composite Membrane 107
III.2.4. Catalytic Activity of PES/Au Composite Membrane 108
III.2.5. Characterization 108
III.3. Result and Discussion 109
III.3.1. Preparation and Characterization of PES/Au Composite Membrane 109
III.3.2. Kinetic Study of the Catalytic Reduction of 4-Nitrophenol 117
III.3.3. Mechanism of Catalytic Activity Enhancement by PES/Au Composite Membranes 127
III.3.4. Enhanced Photothermal Effect of PES/Au composite 135
III.4. Conclusion 147
III.5. References 148
Chapter IV. Core-Satellite Assemblies of Au@Polydopamine@Ag Nanoparticles for Photothermal-mediated Catalytic Reaction 160
IV.1. Introduction 160
IV.2. Experimental Section 164
IV.2.1. Materials 164
IV.2.2. Synthesis of Gold Nanoparticles 165
IV.2.3. Synthesis of Au@PDA@Ag 165
IV.2.4. Catalytic Reduction of 4-Nitrophenol 166
IV.2.5. Characterization 167
IV.3. Result and Discussion 168
IV.3.1. Preparation and Structural Characterizations of Au@PDA@Ag NP assemblies 168
IV.3.2. Catalytic Activity of Au@PDA@Ag NP assemblies 179
IV.3.3. Photothermal-mediated Catalytic Reaction by Au@PDA@Ag NP Assemblies 184
IV.4. Conclusion 195
IV.5. References 196
Chapter V. Synthesis of Ag NPs-loaded Porous Polystyrene and their Catalytic Activity for the reduction of 4-nitrophenol 205
V.1. Introduction 205
V.2. Experimental Section 209
V.2.1. Materials 209
V.2.2. Synthesis of Polystyrene through Dispersion Polymerization 209
V.2.3. Preparation of Sulfonated Polystyrene (SPS) Microspheres 210
V.2.4. Preparation of Porous-Sulfonated Polystyrene (P-SPS) Microspheres 211
V.2.5. Synthesis of P-SPS/Ag Composite Microspheres 211
V.2.6. Catalytic Reduction of 4-Nitrophenol 212
V.2.7. Characterization 212
V.3. Result and Discussion 213
V.3.1. Formation and Characterization of Porous-Sulfonated Polystyrene 213
V.3.2. Loading of Ag NPs on the Porous-Sulfonated Polystyrene 218
V.3.3. Catalytic Activity of P-SPS/Ag Composite toward 4-Nitrophenol Reduction 222
V.4. Conclusion 231
V.5. References 232
Chapter VI. Development of Silver Nanoparticle-based Hydrogel Composites for Antimicrobial Activity 240
VI.1. Introduction 240
VI.2. Experimental Section 244
VI.2.1. Materials 244
VI.2.2. Synthesis of Silver Nanoparticles 244
VI.2.3. Synthesis of Methacrylated Alginate 245
VI.2.4. Preparation of Alginate Hydrogel containing Silver Nanoparticles 246
VI.2.5. Antimicrobial Activity Assay 246
VI.2.6. Characterization 247
VI.3. Result and Discussion 248
VI.3.1. Characterization of Silver Nanoparticles 248
VI.3.2. Preparation and Characterization of Methacrylated Alginate 250
VI.3.3. Formation of Ag NPs-based Hydrogel Composites 254
VI.3.4. Antimicrobial Activity of Ag NPs-based Hydrogel Composites 257
VI.4. Conclusion 264
VI.5. References 265
Acknowledgements 273
- Degree
- Doctor
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