Preparation And Gas Sensing Property Of Polythiophene/Inorganic Composites Materials

With the development of modern industry，the life level has been greatlyimproved，but also suffered serious ecological environment pollution, especially allkinds of poisonous and harmful gas pollution, so it is important for the gas detectionrapidly and accurately. The gas sensor is an important branch of sensing technologyand is received widespread attention. The output of metal oxide semiconductor sensoris the largest and metal oxide semiconductor sensor is mostly widely used, butmetal oxide semiconductor sensor has poor selectivity high operating temperature andthe stability is not satisfactory. So the development of new materiala is veryimportant. In recent years, polythiophene and inorganic material composites havecaused the researchers’ great interest because of composites’ characteristics, such asgood performance,easy preparation, good stability, high conductivity and luminousperformance. According to difference of PTh doping amount, composites can showthe characteristics of the semiconductor to the metal conductor. And composites havea high application potential for the gas sensitive material, electrocatalysis, secondaryrechargeable battery material.This paper has carried out the study of PTh/inorganic composite materials. Theinorganic compositions are WO3and TiO2. PTh/WO3and PTh/TiO2compositematerials are prepared. And the gas sensitive properties of composite materials areresearched, considering the factors of gas sensitive such as working temperature,doping amount. The main research content is as follows1PTh/WO3and PTh/TiO2composite materials with different mass fraction ofpolythiophene are fabricated via the chemical oxidative polymerization. And PTh/WO（3-SDS）and PTh/TiO（2-SDS）composite materials with different mass fractionof polythiophene are also fabricated via the chemical oxidative polymerization. But acertain proportion of sodium dodecyl sulfate (-SDS) is added.The Gas sensitive testresults show that: The best working temperature of PTh/WO3and PTh/WO3(-SDS) is60℃and the best doping polythiophene proportion is50%; The best workingtemperature of PTh/TiO2and PTh/TiO2(-SDS) is80℃and the best dopingpolythiophene proportion is30%. 2Polythiophene was fabricated via the Interfacial polymerization method. PTh/WO3and PTh/TiO2composite materials with different mass fraction ofpolythiophene were fabricated via the method of mechanical ball mill. The Gassensitive test results show that: When the polythiophene doping is50%and workingtemperature is60℃, PTh/WO3has the highest gas sensitive properties; When thepolythiophene doping is30%and working temperature is80℃, PTh/TiO2has thehighest gas sensitive properties.3The products were characterized by FT-IR、XRD、SEM and TG-DTA tounderstand the structure and morphology of composite material characteristics. At thesame time, the composite material’s working temperature and environment werefound. And it has provided the certain research foundation for the compositematerials research.