{"title":"与箝位PbTiO3薄膜相比，具有显著增强的固有压电性的独立PbTiO3薄膜的极化旋转和粗化畴。","authors":"Guangtong Yuan, Zhihan Zou, Dirui Wu, Shiyao Xu, Longji Lyu, Yuan Zhang, Boyuan Huang, Changjian Li* and Jiangyu Li*, ","doi":"10.1021/acs.nanolett.5c01925","DOIUrl":null,"url":null,"abstract":"<p >Applications of ferroelectric films critically depend on their polar ordering, which is highly sensitive to the film size and substrate constraint. Previous studies have revealed a much enhanced piezoresponse in ferroelectric nanoislands relaxed from substrate clamping, yet the proposed mechanisms were completely opposite. We revisit this problem utilizing clamped epitaxial and freestanding PbTiO<sub>3</sub> (PTO) films as our model system for systematic investigation via scanning transmission electron microscopy, piezoresponse force microscopy, and second harmonic generation. It is found that freestanding PTO exhibits 97% higher atomic-scale polar displacement compared to the one clamped on the Sr<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>/SrTiO<sub>3</sub> (SAO/STO) substrate, with ferroelectric <i>c</i>-domains coarsened significantly accompanied by notable polarization rotation and vanishing <i>a</i>-domains. These structural changes yield 141% enhancement in the effective piezoelectric coefficient and 404% increase in second harmonic generation intensity for freestanding PTO compared to its epitaxial counterpart clamped by SAO/STO substrate, highlighting the important influence of substrate constraint on ferroelectric films.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"25 28","pages":"11042–11050"},"PeriodicalIF":9.1000,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Polarization Rotation and Coarsened Domains in Freestanding PbTiO3 Film with Substantially Enhanced Intrinsic Piezoelectricity Compared to Clamped One\",\"authors\":\"Guangtong Yuan, Zhihan Zou, Dirui Wu, Shiyao Xu, Longji Lyu, Yuan Zhang, Boyuan Huang, Changjian Li* and Jiangyu Li*, \",\"doi\":\"10.1021/acs.nanolett.5c01925\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Applications of ferroelectric films critically depend on their polar ordering, which is highly sensitive to the film size and substrate constraint. Previous studies have revealed a much enhanced piezoresponse in ferroelectric nanoislands relaxed from substrate clamping, yet the proposed mechanisms were completely opposite. We revisit this problem utilizing clamped epitaxial and freestanding PbTiO<sub>3</sub> (PTO) films as our model system for systematic investigation via scanning transmission electron microscopy, piezoresponse force microscopy, and second harmonic generation. It is found that freestanding PTO exhibits 97% higher atomic-scale polar displacement compared to the one clamped on the Sr<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>/SrTiO<sub>3</sub> (SAO/STO) substrate, with ferroelectric <i>c</i>-domains coarsened significantly accompanied by notable polarization rotation and vanishing <i>a</i>-domains. These structural changes yield 141% enhancement in the effective piezoelectric coefficient and 404% increase in second harmonic generation intensity for freestanding PTO compared to its epitaxial counterpart clamped by SAO/STO substrate, highlighting the important influence of substrate constraint on ferroelectric films.</p>\",\"PeriodicalId\":53,\"journal\":{\"name\":\"Nano Letters\",\"volume\":\"25 28\",\"pages\":\"11042–11050\"},\"PeriodicalIF\":9.1000,\"publicationDate\":\"2025-07-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nano Letters\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.nanolett.5c01925\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Letters","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.nanolett.5c01925","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Polarization Rotation and Coarsened Domains in Freestanding PbTiO3 Film with Substantially Enhanced Intrinsic Piezoelectricity Compared to Clamped One
Applications of ferroelectric films critically depend on their polar ordering, which is highly sensitive to the film size and substrate constraint. Previous studies have revealed a much enhanced piezoresponse in ferroelectric nanoislands relaxed from substrate clamping, yet the proposed mechanisms were completely opposite. We revisit this problem utilizing clamped epitaxial and freestanding PbTiO3 (PTO) films as our model system for systematic investigation via scanning transmission electron microscopy, piezoresponse force microscopy, and second harmonic generation. It is found that freestanding PTO exhibits 97% higher atomic-scale polar displacement compared to the one clamped on the Sr3Al2O6/SrTiO3 (SAO/STO) substrate, with ferroelectric c-domains coarsened significantly accompanied by notable polarization rotation and vanishing a-domains. These structural changes yield 141% enhancement in the effective piezoelectric coefficient and 404% increase in second harmonic generation intensity for freestanding PTO compared to its epitaxial counterpart clamped by SAO/STO substrate, highlighting the important influence of substrate constraint on ferroelectric films.
期刊介绍：
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
- Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies
- Modeling and simulation of synthetic, assembly, and interaction processes
- Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance
- Applications of nanoscale materials in living and environmental systems
Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.
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