Kim, Shin-Ik Choi, Hyung-Jin Lee, Gwangyeob Roh, Chang Jae Jung, Inki Jung, Soo Young Ning, Ruiguang Won, Sung Ok Chang, Hye Jung Lee, Jong Seok Kim, Seong Keun Kim, Jin-Sang Kang, Chong-Yun Choiag, Ji-Won Baek, Seung-Hyub 2024-01-19T17:31:07Z 2024-01-19T17:31:07Z 2021-09-05 2020-06-01 2051-6347 https://pubs.kist.re.kr/handle/201004/118541 Controlling the structure of a material over a wide range of scales has been extensively pursued because the structure dictates its function. Here, we explore the formation of 3D structures at almost a millimetre scale using single-crystal complex oxides, which has been challenging because of the brittle nature of oxides. Our scheme is to release epitaxial oxide thin film heterostructures from the rigid substrate in order to utilise the elastic epitaxial strain as a driving force for self-shaping the flexible free-standing membrane in a controlled manner. Using an epitaxial free-standing LaAlO3/SrTiO3 membrane as a model system, we were able to create various 3D forms, such as cylindrically-rolled, spherically-bent, and helically-twisted structures, where the inversion-symmetry is broken by the strain gradient via flexoelectric effects. Our results will provide opportunities not only to broaden the application of functional oxides toward flexible electronics, but also to discover new functionalities driven by 3D architectures at various scales. English ROYAL SOC CHEMISTRY TETRAGONAL PHASE VOLUME COLLAPSE ELECTRON-GAS FERROELECTRICITY STABILIZATION ENHANCEMENT 3D architectures of single-crystalline complex oxides Article 10.1039/d0mh00292e 1 MATERIALS HORIZONS, v.7, no.6, pp.1552 - 1557 MATERIALS HORIZONS 7 6 1552 1557 scie scopus 000540812200021 2-s2.0-85092397385 Chemistry, Multidisciplinary Materials Science, Multidisciplinary Chemistry Materials Science Article TETRAGONAL PHASE VOLUME COLLAPSE ELECTRON-GAS FERROELECTRICITY STABILIZATION ENHANCEMENT