In-situ observations of the fracture and adhesion of Cu/Nb multilayers on polyimide substrates

Cordill, Megan J.; Kleinbichler, Andreas; Völker, Bernhard; Kraker, Philipp; Economy, David Ross; Többens, Daniel M.; Kirchlechner, Chrsitoph; Kennedy, Marian S.

doi:10.1016/j.msea.2018.08.043

Cited by 19 publications

(11 citation statements)

References 39 publications

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“…Films or layers that behave in a brittle manner are the easiest film systems to interpret because only two things can occur: (1) fracture followed by (2) delamination ( Figure 3 a–c). Brittle films, generally body-centered cubic (BCC) or hexagonal-closed packed (HCP) metals, such as single layers of Cr, Mo, Ti, Ta, along with indium tin oxide and other oxides [ 31 , 51 , 52 , 54 , 55 , 56 , 57 , 58 , 59 ], and even metallic multilayers and printed films [ 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ] will easily fracture at low applied strains. With in-situ or intermittent imaging of strained samples using optical light microscopy, SEM, or confocal laser scanning microscopy (CLSM), the fractures of films in the form of through thickness cracks (TTCs), also called channel cracks, are observed as well as delamination buckles that form between the crack fragments.…”

Section: Electro-mechanical Testingmentioning

confidence: 99%

“…What has been demonstrated with in-situ XRD, AFM, CLSM, and resistance measurements is brittle interlayers (D/B) and top layers (B/D) cause the ductile films to fail much sooner than if the brittle layer was not present. This behavior has implications not only for flexible electronics and sensors, but also for nanoscale multilayers [ 60 , 61 , 129 ] and thin films used in space applications [ 65 , 130 , 131 ].…”

Section: Materials Influencesmentioning

confidence: 99%

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Materials Engineering for Flexible Metallic Thin Film Applications

2022

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More and more flexible, bendable, and stretchable sensors and displays are becoming a reality. While complex engineering and fabrication methods exist to manufacture flexible thin film systems, materials engineering through advanced metallic thin film deposition methods can also be utilized to create robust and long-lasting flexible devices. In this review, materials engineering concepts as well as electro-mechanical testing aspects will be discussed for metallic films. Through the use of residual stress, film thickness, or microstructure tailoring, all controlled by the film deposition parameters, long-lasting flexible film systems in terms of increased fracture or deformation strains, electrical or mechanical reliability, can be generated. These topics, as well as concrete examples, will be discussed. One objective of this work is to provide a toolbox with sustainable and scalable methods to create robust metal thin films for flexible, bendable, and stretchable applications.

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Section: Electro-mechanical Testingmentioning

confidence: 99%

Section: Materials Influencesmentioning

confidence: 99%

Materials Engineering for Flexible Metallic Thin Film Applications

2022

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“…Since then, several ultrathin MLIs and materials (Cu, Nb, Ag, Ti, etc.) have been evaluated, indicating that residual and interface stress can be tailored by modifying deposition parameters and composition. , Originally developed for space exploration, MLI materials are nowadays also widely used for cryostats and superconductor cooling …”

Section: Introductionmentioning

confidence: 99%

“…have been evaluated, indicating that residual and interface stress can be tailored by modifying deposition parameters and composition. 11,12 Originally developed for space exploration, MLI materials are nowadays also widely used for cryostats and superconductor cooling. 13 Of vital importance for classic space solar insulators is the reflection of the unwanted infrared radiation that causes device heating.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanoscale Metafoils with Enhanced Mechano-Optical Properties for Solar Radiation Isolation

Xomalis

Pütz

Zheng

et al. 2022

ACS Appl. Nano Mater.

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Thin metal films on flexible polymer substrates (foils) are used widely in satellite missions as they show extreme thermal isolation and high interface strength. Here, we show nanoscale "metafoils" with plasmon resonances, allowing interplay with visible radiation while reflecting the unwanted infrared responsible for device heating. The nanomechanical design of metafoils results in crack-free nanodomains, leading to resilient optical resonances withstanding strains up to ∼20%. We perform nanoscale electromagnetic and mechanical simulations to evaluate the metafoils' mechano-optical behavior. Our simulations well fit the experimental positions of strain localization, resulting in material damage. The central nanodomains of metafoils remain crack-free at strains exceeding the crack offset strain of unpatterned foils by >84%. Fragmentation tests show that the crack spacing in metafoils can be tailored, in contrast to unpatterned films, by choosing appropriate structural parameters. Such small-footprint, resilient, and lightweight devices are highly desirable for heat rejection, communications, and spectroscopies in harsh environments.

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“…While uniaxial testing does have significant merit, biaxial straining is more suited to the material system's application load. Furthermore, when combined with insitu X-ray diffraction (XRD) [1][2][3] multilayer film architectures can be examined more thoroughly by providing vital information about the mechanical behavior of different metals in multilayer nanolaminates [4,5]. Of further interest is to examine how the layer order of a simple bilayer system affects the mechanical behavior.…”

mentioning

confidence: 99%