Mechanically‐Guided Deterministic Assembly of 3D Mesostructures Assisted by Residual Stresses. Issue 24 (10th May 2017)

• Record Type: Journal Article
• Authors: Fu, Haoran; Nan, Kewang; Froeter, Paul; Huang, Wen; Liu, Yuan; Wang, Yiqi; Wang, Juntong; Yan, Zheng; Luan, Haiwen; Guo, Xiaogang; Zhang, Yijie; Jiang, Changqing; Li, Luming; Dunn, Alison C.; Li, Xiuling; Huang, Yonggang; Zhang, Yihui; Rogers, John A.
• Is Part Of: Small. Volume 13:Issue 24(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-05-10
• Subjects: 3D mesostructures -- compressive buckling -- microbalance -- mode transition -- residual stress; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201700151
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract : Formation of 3D mesostructures in advanced functional materials is of growing interest due to the widespread envisioned applications of devices that exploit 3D architectures. Mechanically guided assembly based on compressive buckling of 2D precursors represents a promising method, with applicability to a diverse set of geometries and materials, including inorganic semiconductors, metals, polymers, and their heterogeneous combinations. This paper introduces ideas that extend the levels of control and the range of 3D layouts that are achievable in this manner. Here, thin, patterned layers with well‐defined residual stresses influence the process of 2D to 3D geometric transformation. Systematic studies through combined analytical modeling, numerical simulations, and experimental observations demonstrate the effectiveness of the proposed strategy through ≈20 example cases with a broad range of complex 3D topologies. The results elucidate the ability of these stressed layers to alter the energy landscape associated with the transformation process and, specifically, the energy barriers that separate different stable modes in the final 3D configurations. A demonstration in a mechanically tunable microbalance illustrates the utility of these ideas in a simple structure designed for mass measurement. Abstract : A mechanically guided approach assisted by residual‐stress‐induced bending enables deterministic assembly of 3D mesostructures with complex topologies, including those previously inaccessible. Combined theoretical and experimental studies elucidate the underlying mechanics and materials aspects, in a way that establishes quantitative design diagrams in terms of key parameters. This approach has the potential to be broadly useful in 3D microsystem technologies.