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Research On Ultraviolet Detection Based On Surface Plasmon Resonance

Posted on:2016-04-05Degree:DoctorType:Dissertation
Country:ChinaCandidate:X Y ZhangFull Text:PDF
GTID:1228330470457644Subject:Precision instruments and machinery
Abstract/Summary:PDF Full Text Request
Surface plasmon resonance detection technology is highly sensitive to refractive index, and is widely used in many detecting fields. Surface plasmon resonance technology can be used to study optical functional materials, and can expand the use of the optical functional materials. This thesis mainly studied the surface plasmon resonance technology, and promote it to the uv detection field. The main work and research conclusions are as follows:1, A Kreschmann SPR structure is built using a high refractive index prism, the bottom surface of which is coated with a gold film by RF magnetron sputtering method, and a SPR angle scanning platform is built. The platform consists of two rotary stages, both controlled by a stepper motor. The angle scanning resolution of the system is up to0.002°, with the help of the control software, the real-time observation and data record can be achieved. The entire platform provides the foundation for the subsequent2, A new SPR UV detection technology using azobenzene polymer as a sensing material is presented. Because of different intensity ultraviolet radiation, the light-induced cis-trans isomerization rates of azobenzene polymer are different, resulting in different refractive index change rates of the polymer, thereby affecting the changing rate of reflected light intensity of the SPR system, by measuring the changing rate of reflected light intensity, the intensity of ultraviolet can be obtained. Compared with the conventional steady-state method for measuring the intensity of the reflected light, this method requires a short measurement time, it can be less than one minute. UV measurement sensitivity of this method was4.43(mv/s)/(mw/cm2), in the case of reducing the measurement time also ensures a high measurement accuracy.3, A new UV distribution imaging system is designed. The system is based on Kreschmann SPR structure, using azobenzene polymers as sensitive materials. The RI of the azo-polymer decreases under UV light irradiation and recovers under visible light irradiation. As a result of UV irradiation, RI of the azo-polymer decreases, and the intensity of the reflected light increases. By subtracting the intensities of the images recorded before UV irradiation from those after UV irradiation, the images that represent the distribution of the UV light are obtained. The feasibility of the system is tested using different shapes diaphragm.4, A new double-incident angle SPR technique for surface plasmon resonance measurement is described. It is based on differential measurements at two chosen incident angles where the slopes are steepest and the reflectance changes are the biggest. The technique is as simple and robust as the conventional SPR detection measuring the reflected intensities using convergent light beam, but it has the advantage of being nonsensitive to variations of the resonance width and providing a higher sensitivity. Different concentrations of NaCl solutions are used to test the method. Compared with traditional single-incident angle method, sensitivity of this new method is improved by approximately59%. It can be applied in genomics, proteomics, medical diagnostics, and many other fields of science and industry where a real time ultra-sensitive analysis of adsorption or of analyte-receptor binding is of interest.
Keywords/Search Tags:surface plasmon resonance, Rf magnetron sputtering, UV detection, UVimaging, double-incident angle SPR detection
PDF Full Text Request
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