Direct Preparation of Metal Sulfide Fine Particles by Electro-Spray Pyrolysis Method

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Metal sulfide semiconductive fine particles such as ZnS and CdS are very much attractive functional materials as photoconductor, catalysis, liquid crystal material and so on.In this study, fine ZnS and CdS particles were tried to prepare by electro-spray pyrolysis method, and the following results were obtained.1)The electro-spray pyrolysis system was made by putting the high vitage to the needle to which the aqueous solution containing metal nitrate of Zn and Cd and thiourea was introduced by sringe pump.2)The number and size distribution of generated droplets were measured by the differential mobility analyzer and condensation nucleous counter.With the increase in the viscosity of the solution, higher voltage was found to necessary to form the Taylor cone ofsolution at the tip of the needle.3)Fine particles of ZnS AND CdS were able to be prepared by electro-spray pyrolysis method, and the particles obtained were spherical smaller than 0.1mum in diameter.The crystalline phase was found to have hexagonal under limited preparation conditions.4)The size dependence of fluorescence spectrum of ultrafine ZnS and CdS was measured.5)The sizes of particles obtained by the electro-spray pyrolysis method were compared with those obtained by the ultrasonic spray-pyrolysis method, and it was found that the electro-spray pyrolysis method can produce smaller particles by 1/5 in diameter compared with those by ultrasonic spray-pyrolysis method.