Dissertation > Excellent graduate degree dissertation topics show

Self - assembled colloidal ( photon ) crystal and its modified

Author: XiaMingZhe
Tutor: ZuoDuanZuoï¼›YangDeRen
School: Zhejiang University
Course: Materials Physics and Chemistry
Keywords: Photonic crystal Vertical deposition Polystyrene Colloidal crystals Monodisperse Czochralski method.
CLC: TN204
Type: Master's thesis
Year: 2005
Downloads: 492
Quote: 2
Read: Download Dissertation

Abstract


Photonic crystal as a spatially periodic arrangement of dielectric structure, developed in the late 1980s a new functional materials. It is the nature of the dielectric constant different from a dielectric material for periodically arranged in space in order to change the light propagating therebetween. The thesis by the composition of the preparation method and the control of the process conditions the preparation of photonic crystal unit - monodisperse polystyrene (PS) microspheres and monodisperse SiO 2 microspheres, and the vertical deposition method ( Czochralski method) these units self-assembled into a periodic structure. On this basis, try to take advantage of some of the functional material - of CdSe of PbS to modified colloidal crystals. Characterized and studied by XRD, TEM, SEM, UV-Vis transmission spectra, FTIR and other means of analysis and testing of the prepared materials, structure and properties, and the correlation between them law. First and summarized by various synthetic methods, the synthetic route, synthetic formulations, controlled conditions, the complete system established a set of used in laboratories of monodisperse polystyrene (PS) system and monodisperse SiO 2 system. Obtain a high roundness, a narrow particle size distribution (the average deviation LT; 5%), 50nm-2um monodisperse PS microspheres and 10nm-1um monodispersed SiO 2 Microspheres, through its Characterization can know these microspheres fully meet to form a visible light, near infrared, infrared band requirements of the colloidal crystals. Then, to obtain monodisperse PS microspheres and SiO 2 microspheres the vertical deposition (Czochralaski) prepared to come forward centered cubic colloidal crystals: UV-Vis transmission spectrum of face-centered cubic colloidal crystal incomplete bandgap effect, the use of the structural characteristics of field emission scanning electron microscope colloidal crystals and defects. By UV-Vis transmittance spectrum and SEM structural photograph judgment, determine and optimize the process parameters (concentration, temperature, humidity, etc.) of the vertical deposition method main preparation. Colloidal crystal growth process using optical microscopy. Its temperature processing and multi-layer structure and the research, development and a limit vertical deposition method colloidal crystals. Some typical substances modified colloidal crystals. By wet chemical methods, to study the establishment the PS microspheres deposited on the surface preparation techniques to study the self-assembly behavior of the composite microspheres coated CdSe nanocrystals, its bandgap made characterization. Use of the second deposition prepared SiO 2 inverse opal structure by SEM characterization of its structure made use of UV-Vis transmission spectra of its bandgap made. PbS monodisperse nanoparticles were prepared and studied, and try PbS nanoparticles PS microspheres of depositing a self-assembly method and hydrostatic penetration

Related Dissertations

  1. Investigation of Preparation and Properties of Ordered Porous TiO2,TB383.2
  2. Atactic and syndiotactic polystyrene liquid-liquid transition,TQ325.2
  3. PVA / Polystyrene Composite Nanofibers Preparation and Characterization,TQ340.1
  4. Two-dimensional Tunable Bandgap Photonic Crystals Based on VO2 Phase Transition,O734
  5. Research on the High Birefringence Photonic Crystal Fiber Loop Mirror Comb Filter,TN713
  6. Research on the Spectral Characteristics and Sensing Applications of Photonic Crystal Fiber Grating,TP212
  7. Research on Sensing with High Birefringent Photonic Crystal Fiber,TP212
  8. Study on the Influence of Various Defects on the Characteristics of Infrared Photonic Crystal Fiber,TN253
  9. The Research on Characteristics of Two-wavelength Terahertz Modulator Based on Compound Lattice Photonic Crystals,TN761
  10. The Research on Characteristics of Reconfigurable Optical Add/Drop Multiplexer Based on Photonic Crystals,TN929.1
  11. Block copolymer of styrene - butadiene (or isoprene) study of the surface structure of the formation mechanism of,O631.3
  12. Studies on Manufacture of Photonic Crystal Fiber Combiners,TN253
  13. The Investigation of Photonic Crystal One-Atom Laser by Quantum Theory,O431.2
  14. Research on the Polarization Error and Key Component of Optical Fiber Gyroscope,TN253
  15. Study on a New Two-dimensional Photonic Crystal Ring Resonator and Its Application,O734
  16. The application of two-dimensional photonic crystals research,O734
  17. Fusion Splice of Photonic Crystal Fiber and Single Mode Fiber,TN253
  18. Studies on Controlled Air Hole Collapse in Photonic Crystal Fiber,TN253
  19. Studies on Characters and Applications of Tapered Optical Fibers,TN253
  20. Micro-Cavity Design and Characteristics Research of Photonic Crystal Based on Tunable Refractive Index,O734
  21. Study on Two-Dimensional Photonic Crystals Band Properties Based on Finite Element Method,O734

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > General issues > Materials and substances
© 2012 www.DissertationTopic.Net  Mobile