Self‐Assembly of Diblock‐Copolymer Micelles for Template‐Based Preparation of PbTiO₃ Nanograins

Abstract

A bottom‐up fabrication route for PbTiO3 nanograins grown on predefined TiO2 nanostructures used as seeds is presented. The structuring of the TiO2 seeds is performed using a self‐organized template constructed from a gold‐loaded micellar monofilm. With this fabrication process, TiO2 seeds and PbTiO3 grains with diameters of 12 and 30 nm, respectively, are prepared without the need for electron‐beam lithography. The dimensions of the structure imposed by the micellar template are transferred through all the processing steps to the final PbTiO3 grains. Furthermore, it is shown that the intermicelle distance and the degree of order in the dried monofilm is mainly determined by the preparation conditions, such as the pulling velocity in the dipping process and the strength of the surface–micelle interaction, and not necessarily by the architectural properties (block length and ratio) of the diblock copolymers that build the micelles. The intermicelle spacing in the dried film is much smaller than the micelle dimensions in solution, and approaches the dimensions of a fully collapsed micelle when the dipping process is performed slowly enough.

Self‐Templated Synthesis of Single‐Crystal and Single‐Domain Ferroelectric Nanoplates

“…In particular, it was found that CO dissociation does not occur on the bulk Pt surface. [24] The BET surface area measurement yielded a value of 1.71 m 2 g À1 for PT nanoplates, far lower than that of other oxides. [35][36][37] Even with such a low surface area, the temperature of the 100 % conversion of CO with the Pt/PT nanoplate system remains lower by at least 40 8C than that of Pt/CeO 2 nanocomposites (the 100 % conversion of CO was 144-223 8C).…”

“…[21] In particular, it has been predicted that CO and NO catalysis could be favored on ultrathin Pt(100) films supported on ferroelectric PbTiO 3 . [22] Various methods have so far been applied to fabricate 0D and 1D ferroelectric nanomaterials, including templated methods, [23][24][25][26] sol-gel processing, [27,28] soft-chemistry routes, [29] solvothermal/hydrothermal reactions, [30,31] and electrospinning techniques. [32,33] Despite much effort, there is still an absence of a simple wet-chemistry method to prepare 2D single-crystal ferroelectric nanomaterials, such as nanoplates and nanodiscs.…”

Detection of the critical micelle concentration of cationic and anionic surfactants based on aggregation-induced emission property of hexaphenylsilole derivatives

“…They have attracted considerable research attention due to their multiple functions as entities of emulsion polymerization [1][2][3] , templates for nanostructure synthesis [4][5][6][7] , and controllable drug delivery [8][9][10][11][12] . Varieties of natural and synthetic amphiphilic molecules and macromolecules have been derived to build micelles for specific applications.…”

Morphology of water-based chemical solution deposition (CSD) lead titanate films on different substrates: Towards island formation

“…Among them are the high temperature instability of thin films 20 and the use of micro-emulsions 21 or diblockcopolymers. 22 A combination of top-down and bottom-up can also result in well-defined organized nanostructures. Clemens et al for example used electron-beam lithography generated TiO 2 templates as seeds for the formation of PT nanostructures, 23 followed by the deposition of the ferroelectric material by chemical solution deposition, a powerful bottom-up technique.…”