Based On The Hybrid Perovskite Surface-enhanced Ir Research

Surface-enhanced infrared absorption( SEIRA) effect, refers to the organic compound molecular adsorbed on the surface of the nanometer metals base, the intense of the infrared absorption signal than conventional measurements without metals adding several orders of magnitude. Almost all of the transition metal and rare metal surface possess surface-enhanced infrared absorption effect. Currently the most widely studied is SEIRA effect of Au, Ag nano film, however the metals are expensive. Research shows that not only metal base for organic molecules with SEIRA effect, Si surface also have SEIRA effect. Therefore, the choice of Surface-enhanced substrate and fabricate surface-enhanced substrate is especially important for SEIRA effect. Now researchers focus on how simple and rapid preparation of surface-enhanced infrared basement. Organic-inorganic hybrid perovskite as a semiconductor material, has the special optical performance, is widely used in solar cells fields. By far, there is not a related report about using hybrid perovskite crystal thin film materials as surface-enhanced infrared absorption substrate. In this paper, Organic-inorganic hybrid perovskite thin film materials as a template for SEIRA. The substrates were characterized by UV-Vis, DTA-TG thermal analyzer, XRD, Scanning electron microscope and Fourier infrared spectrometer. And acryl amide and L-cysteine were used as probe molecules infrared absorption effects were evaluated, finally the basal material used in chemical analysis practical detection. The specific content of this paper is as follows:Firstly, Organic-inorganic hybrid perovskite structures of crystalline materials were prepared by solvent evaporation method. And hybrid perovskite membrane was prepared by spin coating method. In addition for the preparation of hybrid perovskite structures of crystalline materials were some characterized. The results show that the materials are a peacekeeping two-dimensional perovskite structure material, and have the ability to capture the photoelectron and thermal stability. The morphology of the thin films was characterized by scanning electron microscopy, results showed that: thin film is uniform, smooth, and quality is well.Secondly, with hybrid perovskite membrane CH3NH3 Pb X(X = Cl, Br, I) for surface-enhanced infrared basement, and explore the SEIRA effect of acryl amide and was studied surface-enhanced infrared absorption spectrum of Acryl amide. Result proves that, the film substrate material posses SEIRA effect for Acryl amide.Compared the CH3NH3 Pb Cl3, CH3NH3 Pb Br3, CH3NH3 Pb I3 three basements for acryl amide infrared enhancing signal, estimate the enhancement factor of 80, 150, 82 respectively. Considering the size of the enhancement factor, the final choice hybrid perovskite CH3NH3 Pb Br3 film as the infrared basement of L- cysteine, cytosine nucleoside(cytidine) surface enhanced infrared effect(SEIRA) to evaluate. Results indicate that, the activities of the basement of the two kinds of infrared absorption signal probe has enhanced effect.In the end, benzoyl peroxide(BPO) in flour was quantitative and qualitative analysis by surface enhanced infrared absorption spectra(SEIRAS) technology. In experiment, Choose the characteristic absorption peaks of the BPO of 1224cm- 1, 1959 cm-1 is analyzed. There results showed that, at 1959cm-1, Pure BPO measurement of concentration was between 0.004mol/L and 0.064mol/L. the calibration curve was y=2.8655x+0.0133, correlation coefficient was 0.9958.BPO in flour extract measurement of concentration was between 0.004 mol/L and 0.064 mol/L, the calibration curve was y=8.2405x-0.0019 and correlation coefficient was 0.9970.The recycling rate was 100.4%, RSD was1.01%. At1224cm-1, Pure BPO measurement of concentration was between 0.004mol/Land 0.064mol/L. The calibration curve was y=2.004x+0.0155, correlation coefficient was 0.9970.BPO in flour extract measurement of concentration was between 0.004 mol/L and 0.064 mol/L, the calibration curve was y=7.4398x-0.0013 and correlation coefficient was 0.9949.The recycling rate was 101%, RSD was1.42%.