PROCESS FOR PREPARING UNIDIMENSIONAL NANOSTRUCTURES OF BATIODOPED WITH CERIUM HAVING FERROELECTRIC AND PIEZOELECTRIC CHARACTERISTICS

摘要

The invention relates to a process for preparing unidimensional nanostructures of BaTiOdoped with high purity Cehaving high ferroelectric and piezoelectric characteristics, the nanostructures being used as a transducer in nano-electromechanical systems NEMS, such as energy-recovery systems and advanced sensors. The claimed process consists in preparing initial solutions of barium acetate and cerium acetate in acetic acid and Ti isopropoxide in 2-propanol, the mentioned solutions are mixed, resulting in a stable sol of 0.5 M concentration, which is subsequently deposited on the surface of two polycarbonate membranes having a thickness of 17 μm and a pore density of 10pores/cm, and after moistening the pore walls and filling the channels with sol, the membrane with the channel diameter of 100 nm is kept for 36 hours in air to obtain the nanowires, the channel membrane having a diameter of 200 nm is held in air for 1 hour to obtain the nanotubes, the two membranes containing the dried sols being subsequently dissolved in dichloromethane CHCland then washed with 2-propanol, and again the dry wires and tubes, respectively, remaining after dissolution are deposited on a Si-Pt substrate and calcined in air at 800°C for 1 hour, to obtain, after cooling, wires and tubes with a composition of BaCeTiO.