The Synthesis and Characterization of Quasi-spherical and Plate-like Nanocrystals for the Application of Catalysis and NIR Protection
- Abstract
- Numerous bottom-up approaches has been applied to synthesize noble metal and CuS nanoparticles. Obtaining high-quality nanoparticles with specific shape and size requires serious control over temperature, precursor and stabilizing agents, which alters nucleation and growth of the nanocrystals. Compared to different shape nanocrystals plate-like nanostructures is tedious. Similarly, noble metal nanoparticles with sizes below 100 nm show excellent catalytic activity. To achieve the small size of the nanoparticle chemical reduction method applies hazardous chemicals or very high temperature. Green chemical synthesize of Ag and Au are eco-friendly methods for environmental remediation.
In this study, firstly investigated the solution based synthesis method for Ag and Au nanoparticles below 100 nm using green reagents. These Ag and Au nanoparticles were applied in catalytic reduction of 4-nitrophenol. Secondly, we synthesized CuS plate-like and Ag nanoplate having absorbance and reflectance in NIR region. The plate-like nanocrystals were applied for making thin film for NIR shielding.
Part 1
Successfully synthesize Ag nanoparticles using Rubus Crataegifolius bge (RCB) fruit extract. The investigation of effect of RCB fruit extract indicated that monodispersed small spherical Ag nanoparticle were obtained on using low amount of RCB fruit extract whereas polydispersed hexagonal circular-disk, and rod-shaped Ag nanoparticles were obtained using a higher amount of RCB extract. The Ag nanoparticles show high stability and excellent catalytic activity. Au nanoparticles were synthesized using Schisandra Chinensis as capping and reducing agent. As synthesized Au, nanoparticles were assembled on PS beads using LBL method. PS/AuNPs supported show great potential as innovative green and sustainable catalyst for 4-nitrophenol reduction.
Part II
Plate-like CuS nanoparticles were prepared by a facile aqueous solution method using Radix Puerariae extract. The CuS plate-like nanoparticle absorbs strongly in NIR region. The optical studies of the as synthesized CuS nanostructures mixed with PVA coated on glass revealed excellent NIR-shielding properties. A sealed box with a window coated with CuS/PVA showed low temperature elevation under simulated solar light irradiation. Similarly, Ag nanoplates were synthesized using liquid phase reduction of Ag precursor. These Ag nanoplates show considerable reflectance in the NIR region and good solar shielding property.
- Issued Date
- 2018
- Awarded Date
- 2018. 8
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 화학융합공학부
- Advisor
- Park Seong Soo
- Table Of Contents
- Chapter 1.Introduction 1
Nanoscience 1
1.1 Nanoparticle Synthesis 2
1.1.1 Mechanism of nucleation 3
1.1.2 Capture of nuclei 6
1.1.3 Evolution of nuclei to seeds 7
1.1.4 Growth of seeds to nanocrystals 7
1.1.5Factors governing size and shape of nanoparticles 9
1.2 CuS nanoparticles 11
1.3 Emergence of Green Synthesis 12
1.4 Catalytic application of Ag and Au nanoparticles 14
1.5 NIR Protection of CuS and Ag nanoplates 14
1.6 Objective of research 15
1.7 References 16
PART I. Green Synthesis of Ag and Au Nanoparticles and Their Catalytic Activity 20
Chapter2.Green Synthesis of Silver Nanoparticles and Their Catalytic activity 21
2.1. Introduction21
2.2. Materials and Methods23
2.2.1. Materials 23
2.2.2. Preparation of RCB fruit extract 23
2.2.3. Synthesis of AgNPs 23
2.2.4. Catalytic activity of the AgNPs 24
2.2.5. Characterization of the AgNPs 24
2.3. Results and Discussion 25
2.3.1. UV-Vis analysis 25
2.3.2. TEM analysis 28
2.3.3. SEM and EDS analysis 30
2.3.4. XRD analysis 32
2.3.5. Catalytic activity towards 4-Nitrophenol reduction 34
2.4. Conclusions 36
2.5. References 36
Chapter 3.Green Synthesis of Au Nanoparticles and Their Assembly on PS Microsphere Robust and Recyclable catalyst39
3.1. Introduction 39
3.2. Materials and Methods 41
3.2.1.Materials 41
3.2.2. Preparation of Schisandra chinensis fruit extract 41
3.2.3. Synthesis of Au nanoparticles 42
3.2.4. Synthesis of PS/AuNPs composite particles 42
3.2.5. Catalytic activity of PS/AuNPs composite particles 43
3.2.6.Sample characterization 43
3.3.Results and Discussion 44
3.3.1.UV-Vis analysis 45
3.3.2.TEM analysis and FT-IR analysis 46
3.3.3.DLS analysis 54
3.3.4.SEM analysis 56
3.3.5.XRD analysis 47
3.3.6.EDX analysis 60
3.3.7.Catalytic activity and recyclability 60
3.4.Conclusions 63
3.5.References 63
PART II. Synthesis of CuS and Ag nanoplates for NIR Protection Applications 66
Chapter 4.Synthesis of Plate-like CuS nanoparticles as Efficient Solar Shielding Materials 67
4.1.Introduction 67
4.2.Materials and Methods 68
4.2.1.Materials 68
4.2.2.Preparation of Radix Puerariae root extract 69
4.2.3.Synthesis of CuS nanoparticles 69
4.2.4.Preparation of CuS thin films 69
4.2.5.Preparation of CuS/PVA thin films 69
4.2.6.Sample characterization 70
4.3.Results and Discussion 70
4.3.1.Characterization of CuS nanoparticles 70
4.3.2.NIR Shielding characteristics of CuS thin films 76
4.3.3.Photo-thermal properties of CuS nanoparticles 79
4.3.4.Solar shielding efficiency of CuS/PVA films in a sealed box 81
4.4.Conclusion 83
4.5.References 83
Chapter 5.Synthesis of Ag nanoplates and their NIR Protection Application 85
5.1.Introduction 85
5.2.Materials and Methods 86
5.2.1.Materials 86
5.2.2.Synthesis of silver nanoplates 86
5.2.3.Preparation of thin films of Ag nanoplates 87
5.2.4.Sample characterization 87
5.3. Results and Discussion 88
5.3.1.UV-vis analysis of Ag nanoplate 88
5.3.2.TEM analysis of Ag nanoplate 93
5.3.3.NIR protection analysis of thin films 93
5.4.Conclusions 96
5.5.References 96
개요 98
Acknowledgments 100
- Degree
- Doctor
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