코어/쉘 구조의 고분자/반도체 나노복합체 합성과 그의 광학적 특성

Title
코어/쉘 구조의 고분자/반도체 나노복합체 합성과 그의 광학적 특성
Authors
윤효정
Keywords
코어/쉘 구조의 고분자/반도체 나노복합체 합성과 그의 광학적 특성
Issue Date
2011
Publisher
인하대학교
Abstract
PART 1. Preparation and Electrorheological Characteristic of Polystyrene/CdS Composite Particles CdS/polystyrene (CdS/PS) hybrid particles were synthesized and their physical characteristics including electrorheology were examined. Monodisperse CdS/PS nanocomposite particles with diameters of 2 ?m were obtained via dispersion polymerization. To form cadmium sulfide nanoparticles onto the PS surface, 2-(dimethylamino)ethyl methacrylate (DMEMA) was used as a functional monomer for coordinating with Cd2+ ions. Finally, cadmium sulfide nanoparticles with the size less than 10 nm were formed with the release of S2- ions from thioacetamide (TAA). The morphology of the as-prepared CdS/PS nanocomposite particles clearly showed that the CdS particles are present on the surface of the PS. The optical properties were also studied. In addition, their electrorheological characteristics were confirmed by using optical microscopy with applied electrical field. Recently, dielectric properties of CdS nanoparticles were already reported; however, ER characteristics of CdS/PS nanocomposite particles were investigated for the first time.
Description
PART 1. Preparation and Electrorheological Characteristic of Polystyrene/CdS Composite Particles 1 1.1 INTRODUCTION 2 1.2 EXPERIMENTAL 5 1.2.1 Materials 5 1.2.2 Synthesis of PS seed particles . 5 1.2.3 Synthesis of CdS/PS nanocomposites 6 1.2.4 Characterization 7 1.3 RESULTS AND DISCUSSION . 8 1.3.1 Preparation of CdS/PS composite particles . 8 1.3.2 X-ray diffraction analysis 12 1.3.3 Thermogravimetric analysis 15 1.3.4 UV-vis spectra analysis . 19 1.3.5 Electrorheological fluid characteristic . 21 1.4 CONCLUSION . 24 REFERENCES . 25 PART 2. In-situ Synthesis of Novel Cadmium Sulfide-coated Poly(methyl methacrylate) Nanoparticles and their Optical Properties 29 2.1 INTRODUCTION 30 2.2 EXPERIMENTAL 32 2.2.1. Synthesis of CdS/PMMA dispersions . 32 2.2.2. Characterization . 32 2.3 RESULTS AND DISCUSSION . 34 2.3.1 Preparation of CdS/PMMA composite particles 34 2.3.2 X-ray diffraction analysis 37 2.3.3 Thermogravimetric analysis 40 2.3.4 UV-vis spectra analysis . 43 2.4 CONCLUSION . 45 REFERENCES . 46 PART 3. Optical Properties of PMMA/CdS nanoparticles depending on Synthetic Methods 47 3.1 INTRODUCTION 48 3.2 EXPERIMENTAL 50 3.3 RESULTS AND DISCUSSION . 51 3.3.1 Synthesis of PMMA/CdS nanoparticles 51 3.3.2 Photoluminescence (PL) spectra analysis . 54 3.3.3 Fluorescence spectra analysis . 57 3.4 CONCLUSION . 59 REFERENCES . 60
URI
http://dspace.inha.ac.kr/handle/10505/22971
Appears in Collections:
College of Engineering(공과대학) > Chemical Engineering (화학공학) > Theses(화학공학 석박사 학위논문)
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