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The Fabrication and Modification of Microstructured Polymer Optical Fiber and Its Application in the Field of Chemical Sensing

Author: YangXingHua
Tutor: WangLiLi
School: Xi'an Optics and Fine Mechanics
Course: Optics
Keywords: Microstructured polymer optical fiber pH sensing Fluoride ion sensing Hemicyanine fluorescence enhancement Nitrate sensing
CLC: TN253
Type: PhD thesis
Year: 2008
Downloads: 338
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Abstract


Microstructure fiber (Microstructured optical fiber, MOF) technology is the use of photonic crystal cladding, manipulation of photons in the fiber core movement, to achieve the purpose of transmitted light. Broader application the MOF than traditional fiber, it is one of the optical industry the most popular field of study. In this paper, Universal optical polymer materials - plexiglass (scientific name: poly (methyl methacrylate), abbreviation: PMMA) substrate, preparation of micro-structure polymer fiber (Microstructured polymeroptical fiber, MPOF), MPOF cladding modification technology of the array of holes, and the holes are modified MPOF applied basic research in the field of chemical sensing, biosensing. Fiber preparation technology research, including large size the preform manufacturing technology research and large-size preform stretching technology on two important aspects: (1) the preform preparation techniques, the authors first explore the in situ polymerization of monomers as raw material The optimum conditions. Then the process of extrusion method PMMA pellet substrate were studied to establish the a unique MPOF dedicated manufacturing system equipment and ancillary optimization of process conditions. System of a preform drawing process on the the large size MPOF produced using two methods, the preform of different diameters, different uses of the preform is stretched using different methods: direct drawing method, the secondary precast rod stretching method. The array of holes the MPOF cladding modification technology research includes work in three areas: a porous polymer film modified, porous oxide film modified, as well as nano-metal film modified technology research. In order to explore the modified MPOF of potential applications in the field of chemical and biological sensing OF own design, developed the 18-hole the hexagonal structure MPOF material Exploration the different types modification MPOF of internal doped with different kinds of functional organic pigment molecules, were prepared MPOF pH value measurement probe, the concentration of fluoride ions (F - ) sensing probe: 1.pH sensing probe eosin as indicator, embedded in the cellulose acetate (Cellulose acetate, CA) to take negative pressure suction methods film formation within MPOF. SEM characterization results show eosin-CA-sensitive membrane having a porous structure, the film thickness of about 210nm, having a uniform thickness. Varies strongly depending on the pH value of the MPOF-eosin probe fluorescence intensity at 570nm. , The response was linear within the range in pH = 2.5-4.5. In addition, in a 1:1 ratio of fixed cationic surfactant CTAB response can range from 2.5-4.5 to 1.5-4.5, an apparent pKa between 3.5 and 2.8, respectively 2. Sensing traditional gel (GEL) of membrane technology MPOF special structure combine to construct a novel optical fiber sensing system. Fluoride ion sensing probe the MPOF-gel synthesis laboratory morin-Al complex as indicator. Sensitive membrane performance through water than silicon and doped total precursor KH-560 content regulation. The SEM micrographs characterization Sol (Sol) can formation of MPOF internal well-structured high-strength gel membrane. The probe response affected by pH, pH lower, the higher the intensity of fluorescence, morin-Al low pH values ??may cause leakage. Found TEOS, KH-560, water, ethanol ratio as 1.1 ml, 1.9 ml, 1.2 ml, 2 ml MPOF probe in pH = 4.6 buffer system having a better response characteristics, the response range is 5-50 mol / L, in response equilibrium is reached within 160 s. Finally, nano metal particles in the nano-Ag modified MPOF of the fluorescent dye fluorescence enhancement effect and as electrochemical sensing probe preliminary results. Nano-Ag layer through the glucose restore silver ammonia complex ion (Ag (NH 3 ) 2 ). XRD results Show MPOF internal matter for elemental Ag. The SEM results showed that the growth state of Ag can never discontinuous island-like control to the continuous layer of silver. The Ag layer continuous distribution of the Ag-MPOF probe made of nano-electrode, NO 3 - for the detection of objects. Preliminary cyclic voltammetry study showed nitrate (NO 3 - ) the micro electrode surface in Ag-MPOF, showed good reversible oxidation - reduction characteristics, indicating that high chemical activity. In addition, the island nano-Ag distribution the Ag-MPOF probe Hemi cyanine solution more obvious nano metal particles on a fluorescent dye fluorescence enhancement effect.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
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