The Preparation Of Several Inorganic Nanocomposites And Their Applications In Fluorescence/electrochemical Sensors

The electrochemical and fluorescent sensors have been widely applied in quantitative and qualitative analysis.Compared with traditional analytical technology,electrochemical sensors and fluorescent sensors also have some advantages,such as fast detection,low sample consumption and detection of linear range controllable,equipment easy operation,low cost,micro portable instrument,good selectivity,high sensitivity.In this work,we synthesized the four kinds of inorganic nanocomposites using hydrothermal method,heating reflux method and normal temperature reduction process.The synthesis of four kinds of inorganic nanocomposite material,first,in order to build electrochemical sensor detecting explosives TNT and sodium nitrite in food,second,it was used to build the fluorescent sensors that has the oxidation resistance,anti-inflammatory and resistance to disease of Astaxanthin,third,it was used in catalytic oxidation of ethanol,methanol and catalytic degradation of p-nitrophenol,o-nitrophenol and methylene blue.The main research contents of this paper are as follows:(1)CP6-Gra nanocomposites were prepared by hydrothermal method.A electrochemical sensor has been developed for quantitative detection of TNT based on column[6]arene larger internal cavity,letting the small molecules to enter the inside.This method also have some advantages,such as simple,rapid and high selectivity.the linear range of the electrochemical sensor detect TNT:0.6-10.0 ppm and 10.0-30.0 ppm,a detection limit of 0.2 ppm.the method also used to detecting the actual samples of tap water,ultrapure water recovery rate between 94.7%and 101.2%.(2)Pd-MnO2-nanoflakes nanocomposites were prepared by heating reflux method.A electrochemical sensor towards sodium nitrite has been developed based on sodium nitrite in electrochemical signals.This method also have some advantages,such as simple and high selectivity.The electrochemical sensor of the linear range of detecting sodium nitrite:1.0-2000.0 ?M,a detection limit of 0.33 ?M.The method also used to detecting the actual samples of sausage,South Korea hot cabbage recovery rate between 83.1%and 98.3%.In addition,this material also use to the catalytic degradation of methylene blue dye and environmental hazards of p-nitrophenol.(3)PdPt-SiC nanocomposites were prepared by normal temperature reduction process.A electrochemical sensor towards catalytic oxidation of ethanol and methanol has been developed based on Pd and Pt dual metal catalytic properties.This method also have some advantages,such as simple,rapid and high selectivity.In addition,this material also used to the catalytic degradation of environmental pests p-nitrophenol and o-nitrophenol.(4)SS-?-CD-Gra nanocomposites were prepared by hydrothermal method.A fluorescence sensor towards astaxanthin detection has been developed based on competitive host-guest interaction.This method also have some advantages,such as sensitive,simple,fast detection and high selectivity.The fluorescence sensor of the linear range of detecting astaxanthin:0.0-20.0 ?M and 20.0-40.0 ?M,a detection limit of 0.667 ?M.the method also is used to detecte the actual samples of serum and rain raw red recovery rate between 92.0%and 103.9%.