The observation of surface plasmon-coupled directional fluorescence(SPCDF) on thin iron films was presented. SPCDF from thin iron films was p-polarized with a directional emission angle of 70°. Fluorescein and me...The observation of surface plasmon-coupled directional fluorescence(SPCDF) on thin iron films was presented. SPCDF from thin iron films was p-polarized with a directional emission angle of 70°. Fluorescein and meso-tetra(4-sulfonatophenyl)porphine(TPPS) were used as a model system of dual fluorophores. Using 25 nm thin iron films,the SPCDF signals of the two fluorophores were observed at a fixed angle just by one scan. The SPCDF signals of Fluorescein and TPPS added to whole blood were identified clearly,eliminating the background interference of blood effectively. Thin iron films have been proven to be new materials for SPCDF detection,promoting a new mode to observe the enhanced fluorescence signals of different fluorophores by one scan. They should be useful for tracking the labled systems of multi-fluorophores in biological applications.展开更多
In order to improve the surface hydrophobicity, silicone rubber （SIR） samples were exposed to CF4 radio frequency （RF） capacitively coupled plasma （CCP）. Attenuated total reflection Fourier transform infrared （...In order to improve the surface hydrophobicity, silicone rubber （SIR） samples were exposed to CF4 radio frequency （RF） capacitively coupled plasma （CCP）. Attenuated total reflection Fourier transform infrared （ATR-FTIR） spectrum and X-ray photoelectron spectroscopy （XPS） were used to observe the variation of the functional groups of the modified SIR. Static contact angle （SCA） was employed to estimate the change of hydrophobicity of the modified SIR. The surface energy of SIR is reduced largely from 27.37 mJ/m^2 of original SIR sample to 2.94 mJ/m^2 of SIR sample treated by CF4 CCP modification at RF power of 200 W for a treatment time of 5 rnin. According to the XPS, ATR-FTIR and surface energy analysis, it is suggested that the improvement of hydrophobicity on the modified SIR surface is mainly ascribed to the decrease of surface energy, which is caused by the cooperation of the fluosilicic structure of Si--F or Si--F2 and the fluoric groups of C--CFn induced by the methyl replacement reaction and residual methyl groups of SIR surface.展开更多
文摘The observation of surface plasmon-coupled directional fluorescence(SPCDF) on thin iron films was presented. SPCDF from thin iron films was p-polarized with a directional emission angle of 70°. Fluorescein and meso-tetra(4-sulfonatophenyl)porphine(TPPS) were used as a model system of dual fluorophores. Using 25 nm thin iron films,the SPCDF signals of the two fluorophores were observed at a fixed angle just by one scan. The SPCDF signals of Fluorescein and TPPS added to whole blood were identified clearly,eliminating the background interference of blood effectively. Thin iron films have been proven to be new materials for SPCDF detection,promoting a new mode to observe the enhanced fluorescence signals of different fluorophores by one scan. They should be useful for tracking the labled systems of multi-fluorophores in biological applications.
基金Project(05JT1034) supported by the Plan of Science and Technology Bureau of Hunan Province,China
文摘In order to improve the surface hydrophobicity, silicone rubber （SIR） samples were exposed to CF4 radio frequency （RF） capacitively coupled plasma （CCP）. Attenuated total reflection Fourier transform infrared （ATR-FTIR） spectrum and X-ray photoelectron spectroscopy （XPS） were used to observe the variation of the functional groups of the modified SIR. Static contact angle （SCA） was employed to estimate the change of hydrophobicity of the modified SIR. The surface energy of SIR is reduced largely from 27.37 mJ/m^2 of original SIR sample to 2.94 mJ/m^2 of SIR sample treated by CF4 CCP modification at RF power of 200 W for a treatment time of 5 rnin. According to the XPS, ATR-FTIR and surface energy analysis, it is suggested that the improvement of hydrophobicity on the modified SIR surface is mainly ascribed to the decrease of surface energy, which is caused by the cooperation of the fluosilicic structure of Si--F or Si--F2 and the fluoric groups of C--CFn induced by the methyl replacement reaction and residual methyl groups of SIR surface.
