Preparation And Characteristic Of Sol-gel Oxygen Sensing Thin Film

Sensors are widely used in industrial production, environmental monitoring, biomedical diagnostics, food safety and other fields.To meet needs, sensors are developing toward more sensitive optical chemical sensors. The configurations of sensors are usually relatively simple, so the key of the sensors is the sensitive materials. Sol - gel technique has became a simple preparation technical in preparing photochemical sensing film material process, because of its material composition and preparation process have many advantages, for example flexibility and variability, especially, chemical and biological agents, in molecular or nano-scale level, can be embedded in the inorganic or organic - inorganic hybrid materials if use sol - gel technique in low temperature. In addition, with the development of science and technology, material is required more and more high. Organci-inorganic hybrid material synthesize the excellent features of organic polymer materials and inorganic material. Compared with the pure organic or inoragnic materials, organic-inorganci hybrid materials have good mechanical, thermal, bilogy, optical and electrical performance. Therefore, Organci-inorganic hybrid optcal sensing film is preared by sol - gel method , it′s properties, such as stability, response time, sensitivity and interference ability are developed. Oxygen is considered to be one of the most important elements for anyone to be alive and omnipresent. So the preparation of oxygen sensors have gradually become the major interest aims of the field of optical chemo sensor. Ru(bpy)₃²⁺ doped TiO₂–SiO₂ hybrid materials were synthesized by sol–gel method, from the precursors of tetra-n-butyl titanate, 3-(trimethoxysilyl) propylmethacrylate and methylacrylic acid. Built test devices and it′s property is tested.In chapter one, sol-gel technique and organic - inorganic hybrid materials are discussed , it′s characteristic and application situation are recommend, and photochemical sensor development is reviewed. At last, the main content,research ideas and significance of the dissertation are presented.In chapter two, basic theory and development overview of oxygen sensor are introduced briefly. This chapter mainly includes study oxygen sensitive material and the support of the optical chemical oxyge sensor. In chapter three, Ru(bpy)₃²⁺ doped TiO₂–SiO₂ hybrid materials were synthesized by sol–gel method, from the precursors of tetra-n-butyl titanate, 3-(trimethoxysilyl) propylmethacrylate and methylacrylic acid. Hybrid optical films were deposited on single-crystal silicon wafers or silica glass slides by sol–gel spin-coating. Fourier transmission infrared spectroscopy was used to investigate the chemical groups in the hybrid films. The refractive index of the TiO₂–SiO₂ organic-inorganic hybrid films was measured with the Abbe refractometer. The refractive index of the hybrid films could be adjusted from 1.4 to 1.5 with different amounts of tetra-n-butyl titanate and metylacrylic acid. And non-hydrolytic hybrid film is preliminary studyed.In chapter four, Luminescence spectra of the hybrid films were measured by spectrometer using green light emitting diode as pumping light source. Orange emission at 604 nm was observed from Ru(bpy)₃²⁺ in sol–gel films when excited by green light emitting diode (559 nm).In chapter five, A oxygen sensing testing platform is build and test the orange light intensity change of the optical film in different ratio when pumped by the blue light. The orange light is tested in different ratio of oxygen. Experimental results show that the more of the MAA and TBT in matrix material , the stronger of the light intesity of sensing film. With the increase of oxygen concentration, the light intesity of the oxygen sensing film is weaken .Finally, results of the present work are summarized, and oxygen sensor development was prospected.