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Preparation and Characteristic of Sol-gel Oxygen Sensing Thin Film

Author: JianMingMing
Tutor: XuJian
School: Ningbo University
Course: Communication and Information System
Keywords: Organic - inorganic Hybrid Films Sol - gel Oxygen sensor Fluorescent indicator
CLC: TB43
Type: Master's thesis
Year: 2010
Downloads: 48
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Abstract


The sensor has a very wide range of applications in the field of industrial production, environmental monitoring, biomedical diagnostics, food safety, so as to adapt to the needs and sensitive to higher photochemical sensor device development. Usually relatively simple structure of the sensor device, the sensor key lies in its sensitive materials. Sol - gel technology because of its flexibility of the material composition and preparation process variability, especially at low temperatures the chemical and biological agents in the molecular or nano-scale level embedded in inorganic or organic - inorganic hybrid composite material, and to become a simple preparation technology of preparing a photochemical sensitive material. In addition, with the development of science and technology, the material requirements of increasingly high organic - inorganic hybrid material combines the superior characteristics of the organic polymer and inorganic materials, compared with the corresponding pure organic or inorganic material has better mechanical, thermal, biological, optical and optoelectronic properties. Therefore, the sol - gel process organic - inorganic hybrid photochemical sensing film, its stability, and performance are given to improve response time, sensitivity, and interference ability. And oxygen is the important condition of human survival, and oxygen ubiquitous, exploration and development of the higher sensitivity of the oxygen sensor gradually has become a hot research topic in the field of chemical sensors. Therefore, this thesis by sol - gel method, γ-(methacryloyloxy) butyl titanate, trimethoxysilane and methyl acrylic acid as precursors, doped with fluorescent indicator ruthenium bipyridine Ru ( bpy) 32 to preparing organic - inorganic oxygen sensor film, and structures the light sensor of the test device, on the doped films of the nature of the light sensing properties were tested. The first chapter discusses the selection of the sol - gel method, as well as organic - inorganic hybrid material characteristics and application conditions prepared by this method, and summarizes the photochemical sensor Research and Development, the main content of the thesis, research ideas and research significance. The second chapter describes the basic principles of the oxygen sensor and the development of profiles. Including a study of the oxygen-sensitive fluorescent substance and photochemical oxygen sensor support system. Chapter III presents butyl titanate, γ-(methacryloxypropyl) trimethoxy silane, and methyl methacrylate as the Precursor prepared organic - inorganic sol - gel hybrid material with the spin coating method its optical film is prepared on a monocrystalline silicon wafer or quartz glass substrate. Use of Fourier transform infrared spectrometer, Abbe refractometer and light absorption spectrometer tested the resulting organic - the inorganic composite TiO 2 -SiO 2 optical thin-film structure group, refractive index and emission spectrum. The refractive index of the material is adjusted to change one of the tetrabutyl titanate and the methacrylic acid content. Of a spin-coating (rotating speed of 200 r / min, duration 20 s) the sample prepared, measuring its refractive index of 1.4 to 1.5. And anhydrous hybrid films were preliminary exploration. The fourth chapter describes the incorporation in the matrix of hybrid materials bipyridine ruthenium dye molecules Ru (bpy) 3 2 , thereby preparing a the oxygen sensitive hybrid optical film to study the nature of the refractive index, infrared spectra of the hybrid films, hybrid films issued a bright orange-red colored light (604 nm) in the blue light-emitting diode (559 nm) excitation. Chapter 5 introduces oxygen optical sensor test device structures, the use of the test device to test the the optical film composed of different proportions in the changes in the intensity of the orange-red shade issued under the blue light-emitting diode incentive, and test a hybrid film at different concentrations of oxygen by the excitation light intensity changes, so as to study the oxygen sensor characteristics. The experiments show that the presence of oxygen, the matrix material content of MAA and TBT more, the sensing film, the stronger the light; with increasing oxygen concentration in the oxygen fluorescence quenching under the influence of the oxygen sensor thin film light emitting Etsu to weaker. The sixth chapter is the conclusion to summarize the main results and conclusions of the Experimental Institute, and oxygen sensor development prospect.

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