no abstract in chinese

In this study, protoporphyrin zinc IX (ZnPP) is spun onto cleaned glass substrate. The changes of their UV-Visible spectra are investigated upon exposure to amine vapors. ZnPP as sensing materials shows good sensitivity, fast response and reproducible towards amine vapors sensing. In the presence of amine vapor, Soret band wavelength spectrum response of ZnPP will be red shifted. This red-shift phenomenon in the wavelength spectrum cause by changes in electronic structure of ZnPP. The experimental results are verified by TDDFT Calculation by Gaussian 03.
Gaussian 03 is performed to simulate gas adsorption process and the accompanying changes in the electronic spectra. The adsorption process is carried on the central ring position and the peripheral of porphyrin ring. Based on adsorption energies calculated, the peripheral of porphyrin interaction shows a significant value which is important to note that the central ring position is not the only position which attack by analyte species could occur. TDDFT calculated shift in wavelength spectrum of the central ring adsorption site and substituent ring adsorption site respectively are 12.3 nm and 3.38 nm. Because of the experimental result shows significant red shift in the Soret Band after amine adsorption, therefore the central ring position is chosen as adsorption sites.
Upon exposure to various kinds of primary amines, the ZnPP responses show enhancement of absorbance increases with the alkyl chain length. This can be due to amine basicity. Increasing alkyl chain length will increase amine basicity. The electron-rich alkyl group donates electron density to the N atom and enhances interaction between amine and ZnPP.
In order to quantify concentration dependence of the ZnPP response towards amines, a number of isothermal models can be applied. A plot of c/∆A versus c is linear, therefore ZnPP response is following Langmuir adsorption model.
The sensing properties of porphyrin mixed with polymer and porphyrin mixed with calixarene is also studied. The responses show ∆A porphyrin mixed tbu-Calix[8]arene > ∆A porphyrin > ∆A porphyrin mixed PEG. These results can be explained by the difference surface character for each material.

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