General Nanomolding of Ordered Phases

Liu, Naijia; Xie, Yujun; Liu, Guannan; Sohn, So Young; Raj, Arindam; Han, Guoxing; Wu, Bozhao; Judy, J.; Liu, Ze; Schroers, Jan

doi:10.1103/physrevlett.124.036102

Cited by 23 publications

(25 citation statements)

References 43 publications

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“…[ 17,18,23,51 ] Beyond pure metals, polymers, [ 52 ] metallic glasses, [ 53 ] and a few ordered crystalline materials have proven amenable to pressure driven nanomolding. [ 54 ] Finally, more extensive investigation into this emerging class of materials may be possible by expanding the high‐pressure infiltration technique into single‐crystal gyroidal templates, which have only recently become available. [ 50 ] Thus, the use of high‐pressure infiltration together with bulk BCP self‐assembly–derived ceramic templates presents a wide array of potential projects bridging the disparate fields of soft matter and quantum materials.…”

Section: Discussionmentioning

confidence: 99%

Superconducting Quantum Metamaterials from High Pressure Melt Infiltration of Metals into Block Copolymer Double Gyroid Derived Ceramic Templates

Thedford

Beaucage

Susca

et al. 2021

Adv Funct Materials

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Mesoscale order can lead to emergent properties including phononic bandgaps or topologically protected states. Block copolymers offer a route to mesoscale periodic architectures, but their use as structure directing agents for metallic materials has not been fully realized. A versatile approach to mesostructured metals via bulk block copolymer self‐assembly derived ceramic templates, is demonstrated. Molten indium is infiltrated into mesoporous, double gyroidal silicon nitride templates under high pressure to yield bulk, 3D periodic nanocomposites as free‐standing monoliths which exhibit emergent quantum‐scale phenomena. Vortices are artificially introduced when double gyroidal indium metal behaves as a type II superconductor, with evidence of strong pinning centers arrayed on the order of the double gyroid lattice size. Sample behavior is reproducible over months, showing high stability. High pressure infiltration of bulk block copolymer self‐assembly based ceramic templates is an enabling tool for studying high‐quality metals with previously inaccessible architectures, and paves the way for the emerging field of block‐copolymer derived quantum metamaterials.

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Section: Discussionmentioning

confidence: 99%

Superconducting Quantum Metamaterials from High Pressure Melt Infiltration of Metals into Block Copolymer Double Gyroid Derived Ceramic Templates

Thedford

Beaucage

Susca

et al. 2021

Adv Funct Materials

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“…Potential underlying mechanisms that control this process are bulk diffusion, interface diffusion, and dislocation slip ( Fig. 1B ) ( 20 , 22 , 27 ). To identify the mechanisms underlying TMNM, we analyzed the scaling relations of molding length ( L ) versus molding conditions.…”

Section: Resultsmentioning

confidence: 99%

“…To develop a nanofabrication method that allows control over size, shape, chemistry, and the distribution of elements within the nanowire to result in material combinations requires a thorough understanding of the underlying fabrication mechanisms controlling length, composition, and material transport. Recently, thermomechanical nanomolding (TMNM) has been realized in metals and ordered phases, proposing a new molding principle that can be explored for nanofabrication (19)(20)(21). Although some aspects of the underlying mechanistic of TMNM have been suggested previously, an overall understanding of TMNM and its temperature and size scaling remains elusive (21,22).…”

Section: Introductionmentioning

confidence: 99%

Unleashing nanofabrication through thermomechanical nanomolding

Liu

Raj

et al. 2021

Sci. Adv.

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“…Finally, superplastic nanomolding of bulk metals using the hierarchical alumina mold was carried out with the universal testing machine equipped with a heating unit. Considering that metals have comparable diffusivity at high temperatures, essentially almost all metals can be shaped into hierarchical nanostructures by the SPNM technology because the underlying mechanism of SPNM is diffusion-based dislocation creep. − Typically, a piece of bulk Ag was stacked onto a hierarchical alumina mold, which was sandwiched between the two flat hot plates of the universal testing machine; the molding pressure, temperature, and time were 300 MPa, 400 °C, and 3 min, respectively. The replicated hierarchical Ag nanostructures were released by dissolving the alumina mold in KOH solution (80 °C, 6 mol/L) for 1 h.…”

Section: Methodsmentioning

confidence: 99%

Ordered Hierarchical Ag Nanostructures as Surface-Enhanced Raman Scattering Platforms for (Bio)chemical Sensing and Pollutant Monitoring

Xiang

Fang

et al. 2021

ACS Appl. Nano Mater.

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Surface-enhanced Raman scattering (SERS), due to its extreme sensitivity down to the single molecule level, has been a superior analytical technique for (bio)chemical sensing and monitoring. However, the reliability of SERS has been a major issue since its discovery and has not yet been fully addressed, which is largely due to the lack of properly designed SERS substrates and facile, cost-effective fabrication strategies of metallic nanostructures. Herein, we employ hierarchical metallic nanopatterns as active SERS substrates, which can be facilely fabricated by superplastic nanomolding of bulk metals with hierarchical anodic aluminum oxide templates. The SERS signals of such hierarchical metal substrates show both high sensitivity (SERS intensity of up to 10 6 with an enhancement factor of ∼7.0 × 10 5 ) and reproducibility (relative standard deviation as low as 7%) with an optimized configuration, which significantly outperforms that without hierarchical nanostructures. Our results reveal that the microcavities of the hierarchical molds can significantly reduce the nonuniform plastic deformation of the bulk metals caused by surface roughness, while the nanoholes in the microcavities yield densely packed nanopillars with exceptional SERS signals. These hierarchical metallic nanostructures are further applied for the detection of biomolecules and organic dyes with concentrations as low as 10 −10 M, whose SERS intensity still presents a prominent signal-to-noise ratio. Such facile and scalable fabrication of hierarchical metallic nanostructures not only sheds light on the key factors that affect the uniformity and sensitivity of SERS but also provides guidelines for rational design of superior SERS substrates with outstanding performances, which is of great implication for (bio)chemical sensing and pollutant monitoring.

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General Nanomolding of Ordered Phases

Cited by 23 publications

References 43 publications

Superconducting Quantum Metamaterials from High Pressure Melt Infiltration of Metals into Block Copolymer Double Gyroid Derived Ceramic Templates

Superconducting Quantum Metamaterials from High Pressure Melt Infiltration of Metals into Block Copolymer Double Gyroid Derived Ceramic Templates

Unleashing nanofabrication through thermomechanical nanomolding

Ordered Hierarchical Ag Nanostructures as Surface-Enhanced Raman Scattering Platforms for (Bio)chemical Sensing and Pollutant Monitoring

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