Dissertation > Excellent graduate degree dissertation topics show

CdSe/ZnS Core/Shell Quantum Dots Synthesis and Modification

Author: ZhuYao
Tutor: YangXiangLiang
School: Huazhong University of Science and Technology
Course: Biochemical Engineering
Keywords: Quantum dots Synthesis MePEG - PLA Modify
CLC: O471.1
Type: Master's thesis
Year: 2009
Downloads: 271
Quote: 0
Read: Download Dissertation

Abstract


Quantum dots are semiconductor nanocrystals physical size smaller than the Bohr excitation radius . Usually by the Section II / VI main family or first III / Ⅴ main group elements . When the size of the material is less than the corresponding Bohr excitation radius (typically 1 to 5 nm ) , will produce the quantum confinement effect , making quantum dots has many unique properties , including: narrow emission ( FWHM usually in the 20 to 30 nm ) ; wide excitation ; quantum yield, high ; molar extinction coefficient large ( than the organic dye high 1 to 2 the number of class ) ; anti - light bleaching and chemical degradation ; continuous absorption from the ultraviolet to the near red (700 ~ 900nm) ; fluorescence long life ( greater than 10ns ) ; Stokes shift . Therefore, the quantum dots with a wide range of applications in biology, materials , energy and other fields . In this thesis, synthesis and modification of quantum dots carried out relevant research , including: (1 ) quantum dot synthesis standardization of quantum dot synthesis , controlled program . The synthetic emission wavelength between 520 nm to 590nm quantum point ; the QDs FWHM small quantum yield is high . Were characterized by transmission electron microscopy , X - ray spectroscopy , fluorescence , UV particle size of quantum dots , element type , emission peak , UV absorption , quantum yield of quantum dot concentration . Has been systematically studied for a variety of factors that affect the synthesis of quantum dots in the course of the experiment . (2) quantum dots were investigated wrapped parcel of the one-pot , two-step method for quantum dot core . Were characterized for the parcel before and after the micro - structure of the quantum dots , the changing nature of spectroscopy . The impact wrapped in a variety of factors , a systematic investigation . (3) polymer ( MePEG - PLA ) modification of quantum dots were characterized wrapped the fluorescent properties of the quantum dots ; stability , particle size also carried out a preliminary study ; estimated by the experimental data encapsulation efficiency . For affect inclusions stability factors are discussed. ( 4) small molecules for the modification of the quantum dots by dithiothreitol (DTT) for modification of the quantum dots . The oil-soluble quantum dots into a water-soluble quantum dot , and further modifications reaction with carbonyl diimidazole (CDI) , conducive to the subsequent coupling .

Related Dissertations

  1. Studies on the Synthesis and Technology of Dipentaerythritol and Its Derivative,TQ223.164
  2. Synthesis and Characterization on Semi-Aromatic Polyamides Containing Benzoxazole Units,O633.5
  3. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  4. Video Coding Research Based on Texture Characteristics,TP391.41
  5. Poetic alienation : graphics,J506
  6. Urothermal Synthesis, Structure and Characterization of Functional Coordination Polymers,O631.3
  7. The Total Synthesis of a Flavonoid Glycoside Apigenin-7-O-β-D-glucuronide,R284.1
  8. Atovaquone analogues Design, Synthesis and antitumor activity of,R914
  9. Synthesis and Seperation of 1,1’-binaphthol,O625.3
  10. Flexible,rigid,Synthesis and characterization of mixed ligand complexes,O621.1
  11. Synthesis and Performance Study of Bisphenol AP-based Polybenzoxazines,TQ320.1
  12. Study on the Synthetic Process of Vat Pink R,TQ616.2
  13. Study on the Mechanism of Night Temperature to Grain Filling of Inferior in Rice,S511
  14. Gold-catalyzed Addition Reaction of Sulfonates and Alkynes and Study of Synthesis and Bioactivity of (E)-3-phenyl-substituted Acrylic Acids,R914
  15. Synthesis and Identification of P22/P221 Polypeptides of IBDV Ligand Epitope and Screening CEF Library,S852.65
  16. The Properties and Synthesis of Photochromic Indole-Substituted Fulgides,O626
  17. Curing Mechanism and Properties of Fluorenyl Epoxy Resin,TQ323.5
  18. Study on Antioxidant Activities and Lipase-catalyzed Transesterification of Lard to Produce L-ascorbyl Fatty Acid Esters,TS202.3
  19. Syntheses of Novelbenzopyran Compounds Containing Fluorine and Induced Resistance to TMV,S435.72
  20. Research on the Physiology Mechanism of Grain Filling of inferior Grain during Day and Night Chemical Regulations,S511
  21. Expression of β-Catenin in Pig’s Ovary and the Effect of β-Catenin on Porcine Granulosa Cells Apotosis and Steroidogenesis Related Enzyme,S828

CLC: > Mathematical sciences and chemical > Physics > Semiconductor physics > Semiconductive Theory > Semiconductor quantum theory
© 2012 www.DissertationTopic.Net  Mobile