Self‐Organized Epitaxial Vertically Aligned Nanocomposites with Long‐Range Ordering Enabled by Substrate Nanotemplating. Issue 23 (12th April 2017)

• Record Type: Journal Article
• Authors: Fan, Meng; Zhang, Bruce; Wang, Han; Jian, Jie; Sun, Xing; Huang, Jijie; Li, Leigang; Zhang, Xinghang; Wang, Haiyan
• Is Part Of: Advanced materials. Volume 29:Issue 23(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-04-12
• Subjects: directed self‐assembly -- long‐range ordering -- LSMO:CeO2 -- substrate treatment -- vertically aligned nanocomposites; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201606861
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract : Vertically aligned nanocomposites (VAN) thin films present as an intriguing material family for achieving novel functionalities. However, most of the VAN structures tend to grow in a random fashion, hindering the future integration in nanoscale devices. Previous efforts for achieving ordered nanopillar structures have been focused on specific systems, and rely on sophisticated lithography and seeding techniques, making large area ordering quite difficult. In this work, a new technique is presented to produce self‐assembled nanocomposites with long‐range ordering through selective nucleation of nanocomposites on termination patterned substrates. Specifically, SrTiO3 (001) substrates have been annealed to achieve alternating chemical terminations and thus enable selective epitaxy during the VAN growth. La0.7 Sr0.3 MnO3 :CeO2 (LSMO):CeO2 nanocomposites, as a prototype, are demonstrated to form well‐ordered rows in matrix structure, with CeO2 (011) domains selectively grown on SrO terminated area, showing enhanced functionality. This approach provides a large degree of long‐range ordering for nanocomposite growth that could lead to unique functionalities and takes the nanocomposites one step closer toward future nanoscale device integration. Abstract : Vertically aligned nanocomposites (VAN) present a novel material platform for creating high‐quality self‐assembled, nanopillars‐in‐matrix architectures. A simple substrate nanotemplating method is demonstrated to grow self‐organized VANs with long‐range ordering. Taking advantage of the surface nanopatterns of alternating chemical termination strips derived by thermal‐treatment, the nanotemplated substrates serve well for selective growth of the VAN phases.