TiO₂Nanowire Array Thin Film Interference Sensor And The Sensitivitie’s Study

On the FTO glass were prepared by single-step hydrothermal method, in situ of1.0-1.5μm film thickness of TiO2nanowire arrays, using this composite structure asa thin film interference sensor sensing chip, combined with tungsten halogen lightsource, CCD spectrometer, a prism coupler, and a flow tester of slots similar spectralmeasurement Kretschmann configuration of thin-film interference sensor. Aqueoussodium chloride solution in a non-adsorption type refractive index of the refractiveindex of the liquid sensor sensitivity test. Results showed a refractive index at a givenrange of the solution (1.3335-1.3604), the absorption peak wavelength of theinterference sensor increases as the refractive index increases linearly. TiO2nanowirearrays with DNA for small molecules adsorbed adsorbate investigated the adsorptioncharacteristics of the sensor to the AO dye. The results showed that, compared with afilm of TiO2has a line array sensor interference nanowire array films of the modifiedsensor of small DNA molecules significantly improve the detection sensitivity,because of its large absorption in the waveguide layer. Studies using TiO2nanowirearrays film waveguide layer and at the same time as the preparation of the sensitivelayer thin film interference sensor prism coupling structure. CCD spectrometercombined with different concentrations of NaCl solution, sucrose solution, suchsolution and adsorption of the dye AO small molecules were studied. The results showthat the film was not only the sensitivity of the interference sensor is a high refractiveindex variation, and can be used to test the adsorption of small molecules. Refractiveindex of the test solution at different concentrations of NaCl showed that thereproducibility of the sensor response of the liquid refractive index very smalldetection error. Through experiments on obtaining the liquid refractive index sensorsensitivity calibration curve combined with the determination of the liquid refractiveindex curve Ke and concentration, and versatile. In summary, this film interferometersensors have good prospects, so its in-depth studies are also very significant. This paper develops a novel interferometric sensors TiO2nanowire arrays. First,by hydrothermal synthesis method FTO conductive glass surface prepared TiO2nanowire arrays film. Then, this composite structure as the sensor chip, usingKretschmann prism coupling structure constructed based on wavelength modulationKretschmann configuration of the interference film sensor. Finally, in order to studythe sodium chloride aqueous medium refractive index of the sensor ’s sensitivity toenvironmental performance liquid sample. The results showed that: the refractiveindex of the sensor within the range of1.3335~1.3604have a good response. In theTM mode, in the range of0to3%, and the concentration range of3to15percentsodium chloride concentration and the intensity of the reflected light sensor,respectively, showed a good linear relationship. In the TE mode, at a concentrationwithin the range of0to3%, sodium chloride concentration and the absorptionintensity showed a good linear relationship between the wavelength substantiallyconstant; in a concentration within the range of3to15%, with the concentration ofsodium chloride increased gradually wavelength redshift, sodium chlorideconcentration and wavelength into good linear relationship.The sensor chip of this biomolecule adsorption test showed a high sensitivity.Because it can replace conventional SPR sensor chip, and do not consume preciousmetal gold, so its application is very promising.