Abstract
A new electrospray pyrolysis method using ac voltage was developed to aim for the mass production of nanoparticle. In the electrospray method, ac high voltage with 60Hz was supplied to the spray nozzle instead of dc high voltage and the generation of droplets was synchronized with ac frequency. Solutions of ethyl alcohol with zinc nitrate and thiourea was used as the source to produce ZnS nanoparticles. ZnS particles were also produced by dc electrospray pyrolysis to estimate the performance of the new method.
The particles prepared by ac electrospray were the mixture of the cubic ZnS, solid S and solid Zn and their shapes were oval. Yields of particle production were drastically improved by ac eletrospray. The particle sizes and distributions cloud be smaller by the synchronization of droplet ejection and ac frequency.
