Block Copolymer-Assisted Nanopatterning of Porous Lead Titanate Thin Films for Advanced Electronics

authors	Castro, A; Ferreira, P; Vilarinho, PM
nationality	International
journal	JOURNAL OF PHYSICAL CHEMISTRY C
keywords	CHEMICAL SOLUTION DEPOSITION; FERROELECTRIC-FILMS; RAMAN-SCATTERING; NANOSCALE; NANOPOROSITY; FABRICATION; PBTIO3; PIEZO; TIO2
abstract	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.
publisher	AMER CHEMICAL SOC
issn	1932-7447
year published	2016
volume	120
issue	20
beginning page	10961
ending page	10967
digital object identifier (doi)	10.1021/acs.jpcc.6b02581
web of science category	Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category	Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier	WOS:000376840900024