resumo
Chemical self-assembly of functional ferroelectric PbTiO3 using amphiphilic block copolymers is used to prepare low-cost nanopatterned porous thin films with nanostructure control down to similar to 22 nm of lateral size. The approach developed in this work is highly effective in patterning PbTiO3 and avoids costly high-resolution lithography techniques and harmful etching processes. Nanopatterned films presenting a honeycomb-like arrangement of pores with diameters between 80 and 140 nm are obtained. The ordering and thickness of the films are discussed as a function of the precursors concentration and withdrawal rate used for films dip-coating. The nanopatterned porous films with thickness of 22 mn exhibit tetragonal perovskite crystallographic phase and ferroelectric response at the nanoscale. These films display vertical open porosity from the film surface to the substrate, leading to nearly 50% of the substrate surface being accessible to further functionalization toward low-cost, sustainable, multifunctional composites for the microelectronics industry.
palavras-chave
CHEMICAL SOLUTION DEPOSITION; FERROELECTRIC-FILMS; RAMAN-SCATTERING; NANOSCALE; NANOPOROSITY; FABRICATION; PBTIO3; PIEZO; TIO2
categoria
Chemistry; Science & Technology - Other Topics; Materials Science
autores
Castro, A; Ferreira, P; Vilarinho, PM
nossos autores
Alichandra Maria Gonçalves Castro
Estudante de doutoramento
Paula Celeste da Silva Ferreira
Investigador Coordenador
Paula Maria Lousada Silveirinha Vilarinho
Vice-Diretoragradecimentos
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (ref FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable cofinanced by FEDER under the PT2020 Partnership Agreement. The authors are grateful to FCT and POPH/FSE for doctoral fellowship SFRH/BD/67121/2009 and investigator fellowship IF/00327/2013.