Synthesis and Optical Characterization of Silole Derivatives and Silicon Nanoparticles

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아룬 쿠마 샤르마
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Part 1
Nanocrystalline porous silicon surfaces have been used to detect nitroaromatic compounds in vapor phase. The mode of photoluminescence is emphasized as a sensing attitude or detection technique. Quenching of photoluminescence from nanocrystalline porous surfaces as a transduction mode is measured upon the exposure of nitroaromatic compounds. Reversible detection mode for nitroaromatics is, too, observed. To verify the detection afore-mentioned, photoluminescent freshly prepared porous silicons are functionalized with different groups. The mechanism of quenching of photoluminescence is attributed to the electron transfer behaviors of quantum-sized nano-crystallites in the porous silicon matrix to the analytes (nitroaromatics). An attempt has been done to prove that the surface-derivatized photoluminescent porous silicon surfaces can act as versatile substrates for sensing behaviors due to having a large surface area and highly sensitive transduction mode.
Part 2
We describe the synthesis and characterization of silicon nanoparticles prepared by the soluton reduction of SiCl4. These reactions produce Si nanoparticles with surfaces that are covalently terminated. The resultant organic derivatized Si nanoparticles as well as a probable distribution of Water-soluble Si nanoparticles are observed and characterized by photoluminescence(PL) spectroscopy. This work focuses originally on the organic- and water-soluble silicon nanoparticles in terms of the photoluminescence. Further this work displays probably the first layout of hydrogen terminated Si nanoparticles synthesized in solution at room temperature.
Part 3
The silole derivatives (dibenzosiloles or the silafluorenes) i.e. 1,1-dichloro-1-silafluorene and 1,1-dimethyl-1-silafluorene as well as 9,9'-spiro-9-silabifluorene compounds were synthesized from 1,2-dibromobenzene, n-butyllithium and silicon tetrachloride in higher yields characterized by NMR spectroscopy. The dibenzosiloles are expected to be efficient host materials for the blue-light emitting diodes.
Alternative Author(s)
Arun Kumar Sharma
자연과학대학 화학과
일반대학원 화학과
Awarded Date
Table Of Contents
Abstracts 1
Part 1 3.
1.1. Introduction 4
1.2. Background 7
1.3. Experimentals and Instrumentation 9
1.4. Formation of Porous Silicon Surface 12
1.5. Availability of Nitroaromatic Compounds 13
1.6. Illustration of the Vapor Sensing (detection of nitroaromatics) 14
1.7. Synthesis of Methylvinyl Silole 15
1.8. Surface-derivatizations of Porous Silicon 16
1.9. Results and Discussion 19
1.10. Fluorescence Quenching Studies 30
1.11. Electronic and Structural Effects of Porous Films 42
1.12. Adsorption Effects 45
1.13. Mechanism of PL Quenching 47
1.14. Conclusions 49
1.15. References 49

Part 2 56
2.1. Introduction 57
2.2. Background 58
2.3. Experimentals 62
2.4. Results and Discussion 63
2.5. Photoluminescence Behaviors 66
2.6. Time-dependence of PL Spectrum 71
2.7. Physical Appearances 76
2.8. Stability Study 78
2.9. Conclusions 80
2.10. References 81

Part 3 85
3.1. Introduction 86
3.2. Background 86
3.3. Results and Discussion 87
3.4. Experimentals 93
3.5. Conclusions 97
3.6. References 97
Acknowledgements 99
아룬 쿠마 샤르마. (2007). Synthesis and Optical Characterization of Silole Derivatives and Silicon Nanoparticles.
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General Graduate School > 4. Theses(Ph.D)
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