Fabrication and Deformation of 3D Multilayered Kirigami Microstructures

Humood, Mohammad; Shi, Yan; Han, Mengdi; Lefebvre, Joseph; Yan, Zheng; Pharr, Matt; Zhang, Yihui; Rogers, John A.; Polycarpou, Andreas A.

doi:10.1002/smll.201703852

Cited by 31 publications

(18 citation statements)

References 32 publications

(31 reference statements)

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“…The strain then starts to increase under further stretching. The maximum principal strain at a applied biaxial strain of 0% (fully released) is lower than the typical fracture limit of bulk Si (≈2%) and also that of single crystalline nano Si (5–7%) . The results suggest that higher biaxial prestrain are possible, where the areal fill factor could also further increase as described in the following.…”

mentioning

confidence: 68%

Biaxially Stretchable Ultrathin Si Enabled by Serpentine Structures on Prestrained Elastomers

Sim

Song

et al. 2018

Adv Materials Technologies

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most of the materials' intrinsic fracture limit. [1][2][3][4][5] Realized through the combinations of materials, device layouts, and mechanical structure designs, stretchable electronics have a broad range of applications in areas ranging from wearable photo voltaics, to personal health monitors, to sensitive robotic skin prosthetics, to soft surgical tools, and to electronic "eyeball" imaging devices. [6][7][8][9][10] In all of these cases, mechanical stretchability is a key, enabling characteristic. Recent advances in material design and synthesis have led to many stretchable polymeric functional materials such as conductors, [11][12][13] semiconductors, [14,15] mechanophores, [16,17] etc., which provide immediate outlets to stretchable electronics. [13][14][15]18] In particular, from the perspective of electronics performance, among all kinds of stretchable electronics, those employing inorganic materials are especially attractive since they are able to offer a high profile of device performance besides their mechanical merits for applications such as biomedical instruments, where high performance is required.To date, many studies have reported on developing stretchable inorganic semiconductors from materials, such as Si, which are intrinscally brittle. One prevalent strategy is the prestrain strategy, in which very thin stiff films are first bonded or deposited on a prestretched elastomer substrate and then the prestrain on the elastomer is released resulting in simultaneously generated surface microstructures. The prestrain strategy has been successfully adopted to generate stretchable Si-based electronics, which represents a way of exploiting out-of-plane deformation to induce stretchability. [19][20][21][22][23][24][25][26][27] In this case, the stretchability is limited to the prestrain applied on the elastomer substrate; the thin films become flattened when stretched at the same extent of the prestrain, and further stretching will induce fracture. In addition, most of the reported devices were generated by uniaxial prestrains on materials in the configuration of thin films, ribbons, or wires. [19][20][21][22][23][24] Thin films bonded with prestretched elastomer substrate along biaxes give rise to undefined surface topographies depending upon the orders of the prestrain relaxation.The other widely adopted strategy, which lies in constructing devices in the configuration of thin serpentine interconnects with island shaped Si functional electronics, has been explored for stretchable electronics, where in-plane geometries of the thin serpentine wires enable stretchability. [28][29][30] In this case, the stretchability simply depends on the ratio of contour length Building stretchable electronics from inorganic materials is a testified pathway toward devices with high performances for many applications in fields such as optoelectronics, biomedical, etc. Owing to the unstretchable nature of these materials (e.g., brittleness of Si), existing ways to enable stretchabilities mainly involve either bonding thin f...

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confidence: 68%

Biaxially Stretchable Ultrathin Si Enabled by Serpentine Structures on Prestrained Elastomers

Sim

Song

et al. 2018

Adv Materials Technologies

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“…Although fabrication techniques based on 3D printing, templated growth, and controlled folding/rolling are useful in many contexts, each has limitations in materials compatibility, accessible feature size or, most critically, alignment with state‐of‐the‐art 2D processing techniques used in the semiconductor industry. A portfolio of recently presented methods allow geometric transformation of such 2D systems (referred to here as 2D precursors) into 3D structures by the action of compressive forces delivered at precisely defined locations via a prestretched silicone elastomer substrate . Such strategies are compatible with the most advanced planar technologies and functional materials, with feature sizes that can span from nanometer to meter scales .…”

Section: Introductionmentioning

confidence: 99%

Transformable, Freestanding 3D Mesostructures Based on Transient Materials and Mechanical Interlocking

Park

Luan

Kwon

et al. 2019

Adv Funct Materials

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Areas of application that span almost every class of microsystems technology, from electronics to energy storage devices to chemical/biochemical sensors, can benefit from options in engineering designs that exploit 3D micro/nanostructural layouts. Recently developed methods for forming such systems exploit stress release in prestretched elastomer substrates as a driving force for the assembly of 3D functional microdevices from 2D precursors, including those that rely on the most advanced functional materials and device designs. Here, concepts that expand the options in this class of methods are introduced, to include 1) component parts built with physically transient materials to allow triggered transformation of 3D structures into other shapes and 2) mechanical interlocking elements composed of female‐type lugs and male‐type hooks that activate during the assembly process to irreversibly “lock‐in” the 3D shapes. Wireless electronic devices demonstrate the utility of these ideas in functional systems.

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“…1d and e). Aer dialysis, the nanostructures were subjected to elemental analysis, 51,52 which showed a similar chemical composition of N, C, and H as the SCMs (Table S1 †). Furthermore, 1 H NMR spectroscopy of a small amount of the precipitate showed similar peaks to the acrylate-PCL-N 3 (Fig.…”

Section: Resultsmentioning

confidence: 99%