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Atomic insight into spin, charge and lattice modulations at SrFeO3−x/SrTiO3 interfaces

Novel phenomena and functionalities at interfaces of oxide heterostructures are currently of great interest in a wide range of applications. At such interfaces, charge, spin, orbital and lattice ordering coexist and correlate closely, contributing to rich functional responses. By using atomically resolved imaging and spectroscopy techniques, we investigated magnetic behaviors and structural modulation at the SrFeO3−x/SrTiO3 interface. Fe/Ti element intermixing and oxygen vacancies occurred across a few unit cells at the interface. Furthermore, antiferromagnetic spin ordering of Fe with different valence states in the interface of SrFeO3−x/SrTiO3 induced uncompensated magnetic moments. Compared to the SrFeO3−x/La0.3Sr0.7Al0.65Ta0.35O3 heterojunction, the variations of charge and lattice order parameters at the SrFeO3−x/SrTiO3 interfaces were also determined by advanced electron microscopy, which provided a good understanding of the physical origin of disparate macroscopic magnetic properties, further investigated by magnetometer measurements and X-ray magnetic circular dichroism (XMCD) spectra. These studies provide comprehensive insight into the interfacial modulation of ferrite oxide, which may be useful for designing future devices in oxide electronics.

Nanoscale2021

A molecular design principle towards luminescent polymorphic organic heterostructured architectures

Polymorph-selective synthesis of organic heterostructured architectures represents a tough challenge due to the diversity of organic species and the growth complexity of seed crystals with specific polymorphs as well as complicated epitaxial relationships among diverse constituent materials. Herein, we employ three polymorphic π-conjugated molecules to construct three types of binary organic heterostructures based on a molecular design principle via a solution seeded-mediated strategy, where pre-existing crystals with a specific polymorph serve as seeds to afford epitaxial growth of another organic crystal. As a consequence, the crystal form of the second growth component can be exclusively determined regardless of the synthetic procedures. Indeed, epitaxial growth of these dual-color-emitting organic heterostructures was realized depending on the small lattice mismatch between two specific polymorphs of any two constituent materials, which is determined by their structural compatibility and elaborate selection of the seed crystals. The present work offers a promising platform to understand polymorph-selective synthesis of organic heterostructured microstructures, which may be used to achieve unprecedented photonic and electronic properties.

Journal of Materials Chemistry C2021

Corannulene-based donor–acceptor-type conjugated polymers with electrochromic properties

π-Conjugated polymers have received increasing attention in electrochromic material research because their color change can be altered over a wide range by introducing electron-donor (D) and electron-acceptor (A) moieties. In this study, we have synthesized curved corannulene-based monomers with D and A moieties and applied them to prepare π-conjugated polymers to drive color switching. The absorption and emission properties of our conjugated polymers can be tuned by inserting D and A moieties into the conjugated backbone. Through this study, it has been demonstrated that corannulene-based conjugated polymers exhibit stable electrochromic properties with a high optical contrast ratio. Furthermore, emissions in the solid state and reversible electrofluorescence switching are observed in these polymers. This might be due to the inhibition of aggregation-induced quenching through the incorporation of nonplanar corannulene in the π-conjugated backbone. Based on these results, we consider corannulene-embedded π-conjugated polymers as a new π-conjugated system with versatile and tunable optical properties for application in modern optoelectronic devices.

Journal of Materials Chemistry C2021