التفاصيل البيبلوغرافية
| العنوان: |
Enabling Durable Ultralow-k Capacitors with Enhanced Breakdown Strength in Density-Variant Nanolattices |
| المؤلفون: |
Kim, Min-Woo, Lifson, Max L., Gallivan, Rebecca, Greer, Julia R., Kim, Bong-Joong |
| المصدر: |
Advanced Materials, 35(6), Art. No. 2208409, (2023-02-09) |
| بيانات النشر: |
Wiley |
| سنة النشر: |
2023 |
| المجموعة: |
Caltech Authors (California Institute of Technology) |
| مصطلحات موضوعية: |
Mechanical Engineering, Mechanics of Materials, General Materials Science |
| الوصف: |
Ultralow-k materials used in high voltage devices require mechanical resilience and electrical and dielectric stability even when subjected to mechanical loads. Existing devices with organic polymers suffer from low thermal and mechanical stability while those with inorganic porous structures struggle with poor mechanical integrity. Recently, 3D hollow-beam nanolattices have emerged as promising candidates that satisfy these requirements. However, their properties are maintained for only five stress cycles at strains below 25%. Here, we demonstrate that alumina nanolattices with different relative density distributions across their height elicit a deterministic mechanical response concomitant with a 1.5–3.3 times higher electrical breakdown strength than nanolattices with uniform density. These density-variant nanolattices exhibit an ultralow-k of ≈1.2, accompanied by complete electric and dielectric stability and mechanical recoverability over 100 cyclic compressions to 62.5% strain. We explain the enhanced insulation and long-term cyclical stability by the bi-phase deformation where the lower-density region protects the higher-density region as it is compressed before the higher-density region, allowing to simultaneously possess high strength and ductility like composites. This study highlights the superior electrical performance of the bi-phase nanolattice with a single interface in providing stable conduction and maximum breakdown strength. ; B.-J.K. and J.R.G acknowledge financial support from the "GIST-Caltech Research Collaboration" grant funded by the GIST in 2020. B.-J.K acknowledges financial support from the National Research Foundation of Korea under Project Number NRF-2021R1A2C1005741 and GIST Research Institute (GRI) grant funded by the GIST in 2022. Portions of this work were conducted in the Lewis lab at Caltech. Author Contributions. M.-W.K. and M.L.L. contributed equally to this work. B.-J.K. and J.R.G. conceived the idea of this work and supervised the research at all stages. M.L.L. and ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| Relation: |
https://doi.org/10.1002/adma.202208409; eprintid:118992 |
| DOI: |
10.1002/adma.202208409 |
| الاتاحة: |
https://doi.org/10.1002/adma.202208409 |
| Rights: |
info:eu-repo/semantics/openAccess ; Other |
| رقم الانضمام: |
edsbas.4E4FE6A5 |
| قاعدة البيانات: |
BASE |