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Photoluminescent materials have been shown to play a significant role in the fields of bioimaging, biosensors, and photocatalysis. Polyaniline (PANI) is an attractive class of conjugated polymers for a variety of advanced technologies, especially the electrical and optical applications. Moreover, PANI is unique in conducting polymer family due to its ease of synthesis, environmental stability, and simple doping/dedoping chemistry. Particularly, the luminescence properties of PANI present potential applications in light-emitting diodes, ultra-thin and flexible display devices, photoconductive sensors, and new fluorescent bio-probes.Green chemistry is one of the main development directions of chemical industry. In which, a major change, technological progress are mostly with the new catalytic materials or new catalytic technology. Green catalytic technologies will development with the environmental friendly green chemistry. In recent years, Nano-catalysts is an attractive class in the field of green catalytic technology with the specific higher catalytic, activity and selectivity than normal catalyst. Multi-functional green nano-catalysts are the future direction of Nano-catalysts. So many scientists have focus on the preparation, research, and applications of nano-materials catalysts. Recently many metal nano-catalysts have gradually applied in the hydrogenation catalyst, electro-catalysis, chemical energy, automobile exhaust handling, sewage treatment, etc. Therefore, preparation of multi-function, green nano-catalysts is extremely important both fundamentally and technologically.In order to research the polyaniline’s fluorescent properties and multi-function nano-catalysts, we mainly did several researches as the following aspects:(1) The polyaniline prepared with conventional chemical oxidation are processed with reflux in different acids and hydrothermal treatment under different pH value. A series of product are generated, which are tested by use of fluorescence, infrared instruments, et al. These results indicated that polyaniline dealt with oxidative reflux in sulfuric acid have strong fluorescence properties. Moreover, the water-soluble PANI with strong PL in physiological pH environment will play a significant role in the fields of bioimaging, multi-functional fluorescent bio-probes and biosensors. However, after hydrothermal treatment or other acid oxidation, the fluorescence properties of polyaniline are very weak as well as the poor water- soluble.(2) Nano-polyaniline particles are synthesized with micro-emulsion method. In this system, we used the strongly polarity polyethylene glycol as emulsifiers to improve purity of polyaniline. Then 20-30 nm polyaniline is got. In addition, we use the nano-particles as catalyst to catalytic epoxidation of Cyclohexene. The results indicated that polyaniline nanoparticles have strong catalytic activity, selectivity and high conversion.
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