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Preparation and Characterization of Inorganic and Organic Fluorescence Compound/Polymer Nanocomposite Materials

Author: WangShuGang
Tutor: LiYaoXian;YangQingBiao
School: Jilin University
Course: Organic Chemistry
Keywords: Nanofibers Nanocrystalline Jilin University Fluorescence intensity PhD thesis Nanocomposites Composite nanomaterials Reflux time UV absorption Cetyl trimethyl ammonium bromide
CLC: TB383.1
Type: PhD thesis
Year: 2007
Downloads: 517
Quote: 1
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Abstract


With the development and integrity of nanotechnology, the research on hybrid and composite nanomaterials has undoubtedly been an active field of special interest in the intersection of physics, chemistry, and materials science, of which inorganic/organic nanocomposites with a wide range of interesting properties increasingly become a burgeoning area. As an important embranchment of nanocomposites, these nanocomposites that adulterated semiconductor nanoparticle and organic photoluminescence materials with polymer nanofibers have the potential applications in various fields.In the second chapter, TGA stabilized CdTe nanoparticles (NCs) have been prepared successfully with some low coast material in aqueous, the granularity of the obtained CdTe NCs was ~ 6 nm. The fabrication condition and the performance of CdTe NCs have been researched as well. Experiment results domenstrated that CdTe NCs could be preserved with enougth plotoluminescence intensity for a long time when the pH=10.5 of the solution in the process of preparing CdTe NCs. An idealism method of fabricating CdTe NCs in aqueous has been achieved, which would be a foundation of developing new plotoluminescence nanomaterials that focus on CdTe NCs .In the third chapter, we successfully carried out the adulteration between CdTe and PVA(PVP) in aqueous, and obtained two kinds of CdTe/PVA(PVP) nanofibers. SEM and TEM verified that CdTe NCs have been enwrapped by the abovementioned polymer nanofibers.In the fourth chapter, TGA stabilized CdTe NCs have been transferred successfully from aqueous to organic solution. After enwrapped by CTAB, the photoluminescence intensity of CdTe NCs increased remarkably compared with CdTe aqueous, then mixed with polymer matrix to fabricate CdTe/PS(PVP) nanofibers. The detecting results indicated that CdTe NCs dispersed equably in polymer nanofibers and the photoluminescence intensity of CdTe NCs increased remarkably compared with CdTe/polymer solution.In the fifth chapter, CdTe/ P4VP nanocomposite has been obtained by means of the assembly between CdTe and P4VP nanofibers. The detection results proved that CdTe NCs were attached on the surface of P4VP nanofibers is a cubic lattice. XPS verified that CdTe NCs can combine with P4VP nanofibers to form CdTe/ P4VP nanocomposite, which can be explained by an assemblely model.In the sixth chapter, 1,4-bis(o-cyanostyryl)benzene (ER) and 1-(o-cyanostyryl)-4-(p- cyanostyryl)benzene (EB), two kinds of fluorescent whitening agent (FWA) were introduced into polyer matrix by electrospinning. SEM observed the obtained ER (EB)/PAN (PS, PVP) nanofibers were all nano scale. IR spectra investigated that -CN group in FWA interacted with that in PAN. UV spectra approved ER and EB were all existed in abovementioned nanofibers, espectically, EB and PS can form exciplex to enhance intensively the photoluminescence intensity of EB/PS nanofibers.In summary, it can well produce inorganic/organic nanocomposites by using the combination of Sol-Gel process and electrospinning technique and the combination of electrospinning technique. The results of the experiment show that these processes are generic approach to fabricate one dimensional nanocomposite materials. In addition, these methods and products will have wide applications in the light of the characters of these methods and the qualities of products.

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