Gas Detection Research Based Of Fluorescent Sensor Array

In this paper, they have prepared a fluorescent sensitive gas sensor array and an instrument of gas detection. To enhance the fluorescence of gas sensitive materials, they manufactured three fluorescence enhancement substrates. Specific study contents are as follows:(1) The substrate based of local surface plasmon resonance is manufactured as follows: firstly, they deposited a layer of nanoscale gold film on silicon wafer surface by vacuum evaporation; secondly, assembled 2D silica colloidal crystal film above gold film; thirdly, evaporated a layer of gold film on the top floor. Finally the Rhodamine6G was absorbed in mesoporous silica on the surface. The fluorescence intensity on the substrate compared to the control group is 9 fold.(2) The substrate based of aluminium mirror reflection is manufactured as follows: firstly, they deposited a layer of nanoscale aluminum film on silicon wafer surface by vacuum evaporation; secondly, span the dielectric layer silicon dioxide film with thickness of a quarter wavelength coating on the aluminum film. Finally the Rhodamine6G was absorbed in mesoporous silica on the surface. They discussed the affect that thickness of aluminum film and thickness of the silicon dioxide to the fluorescent intensity of Rhodamine6G.The fluorescence on the substrate with 60 nm aluminum film and 138 nm silica obtain maximum, with 20 fold compared to control group.(3) The substrate based of Bragg diffraction is manufactured as follows:ten opal photonic crystals with different photonic band gaps were fabricated by vertical deposition of co-polymer latex spheres on glass substrates, then use ribose filling photonic crystals pores. The Rhodamine6G was absorbed in mesoporous silica on the surfaces of photonic crystals. They discussed the affect that photonic band gap and thickness of photonic crystals to the fluorescent intensity of Rhodamine6G. The fluorescence on the substrate with reflection at 595nm obtain maximum.(4) According to the character that the fluorescent intensity of porphyrins and dyes will change after they exposure to gas, they have prepared the sensor array consisting of porphyrins and dyes, with the substrate based of Bragg diffraction. They designed an electronic nose device based of fluorescent gas sensitive sensor array. It was used in the detection of ethanol and acetic acid. With Matlab processing the image data collected, they got the result for gas identification.