Versatile Approach for Integrative and Functionalized Tubes by Strain Engineering of Nanomembranes on Polymers

Mei, Yongfeng; Huang, Gaoshan; Solovev, Alexander A.; Bermúdez‐Ureña, Esteban; Mönch, Ingolf; Ding, Fei; Reindl, Thomas; Fu, Ricky K.Y.; Chu, Paul K.; Schmidt, Oliver G.

doi:10.1002/adma.200801589

Cited by 619 publications

(756 citation statements)

References 51 publications

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“…The fabrication strategy was based on rolled-up nanotechnology 28,29 using AAO membranes 30,31 as a sacrificial template, as schematically illustrated in Figure 1a (i-iii). Figure 1b shows a scanning electron microscopy image of a nanoporous microtube (that is, microtubular engine) rolled up from porous Ti/Cr/Pt (7/7/6 nm) nanomembranes using a sacrificial AAO template with small pore diameters of B150 nm.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical nanoporous microtubes for high-speed catalytic microengines

Liu

Huang

et al. 2014

NPG Asia Mater

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Powerful micro-/nano-motors with high speeds and large driving forces in fluids are of great importance in propelling micro-/ nanomachines for various tasks. Here, we achieved highly efficient catalytic locomotion in microtubular engines with hierarchical nanoporous walls. The sophisticated structures provide an enlarged surface area and improved reactant accessibility, which remarkably enhanced their catalytic activity toward H 2 O 2 decomposition, accelerating the microengine's speed. The fast catalytic locomotion of such hierarchical nanoporous microtubes makes them excellent candidates as efficient micro-machines for biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Hierarchical nanoporous microtubes for high-speed catalytic microengines

Liu

Huang

et al. 2014

NPG Asia Mater

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“…A higher optical transmission can also be realized with resonant structures 40,41 . Moreover, instead of conformal film deposition, fabrication based on rolled-up technology provides an alternative method for controlling film conformality and roughness [41][42][43][44] .…”

Section: Experimental Hyperlens Demonstration and Recent Advancesmentioning

confidence: 99%

Hyperlenses and metalenses for far-field super-resolution imaging

2012

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The resolution of conventional optical lens systems is always hampered by the diffraction limit. Recent developments in artificial metamaterials provide new avenues to build hyperlenses and metalenses that are able to image beyond the diffraction limit. Hyperlenses project super-resolution information to the far field through a magnification mechanism, whereas metalenses not only super-resolve subwavelength details but also enable optical Fourier transforms. Recently, there have been numerous designs for hyperlenses and metalenses, bringing fresh theoretical and experimental advances, though future directions and challenges remain to be overcome.O ptical microscopy has revolutionized many fields such as microelectronics, biology and medicine. However, the resolution of a conventional optical lens system is always limited by diffraction to about half the wavelength of light. This diffraction barrier arises from the fact that subwavelength information from an object is carried by high spatial-frequency evanescent waves, which only exist in the near field. To overcome this diffraction limit, pioneering work has been carried out, including near-field scanning microscopy 1 , as well as fluorescence-based imaging methods 2,3 . These scanning-or random sampling-based nonprojection techniques achieve super-resolving power by sacrificing imaging speed, making them uncompetitive for dynamic imaging.Lens-based projection imaging remains the best option for high-speed microscopy. Immersion techniques have been proposed to enhance resolution, but they are limited by the low refractive indices of natural materials 4 . Emerging within the last decade, the fields of plasmonics and metamaterials provide solutions for engineering extraordinary material properties not found in nature, such as negative index of refraction 5,6 or strongly anisotropic materials 7,8 . This has provided tremendous opportunities for novel lens designs with unprecedented resolution 9 . Initiated by Pendry's seminal concept of the perfect lens 10 , a number of superlenses were demonstrated with resolving powers beyond the diffraction limit [11][12][13][14][15][16][17] . The optical superlens first achieved sub-diffraction-limited resolution by enhancing evanescent waves through a slab of silver 11 . As the evanescent-field enhancement is enabled by surface plasmon excitation, the subwavelength image is typically limited to the near field of the metal slab. However, the hyperlens-a metamaterial-based lens-can send super-resolution images into the far field by introducing a magnification mechanism. This has been considered as one of the most promising candidates for practical applications since its first demonstration in 2007 (refs 13,14). Recently, various other metamaterial-based lenses, that is, metalenses, have also been developed with both

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“…Self-assembled Swiss roll geometries have been applied to a wide range of rolled-up devices (for example, [37][38][39][40][41][42] ) based on semiconductor, oxide and metal strained layer engineering. However, for antenna applications, metal-based strained layers are not appropriate because of signal screening.…”

Section: Resultsmentioning

confidence: 99%

Compact helical antenna for smart implant applications

2015

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Smart implants are envisioned to revolutionize personal health care by assessing physiological processes, for example, upon wound healing, and communicating these data to a patient or medical doctor. The compactness of the implants is crucial to minimize discomfort during and after implantation. The key challenge in realizing small-sized smart implants is high-volume cost-and time-efficient fabrication of a compact but efficient antenna, which is impedance matched to 50 Ω, as imposed by the requirements of modern electronics. Here, we propose a novel route to realize arrays of 5.5-mm-long normal mode helical antennas operating in the industry-scientific-medical radio bands at 5.8 and 2.4 GHz, relying on a self-assembly process that enables large-scale high-yield fabrication of devices. We demonstrate the transmission and receiving signals between helical antennas and the communication between an antenna and a smartphone. Furthermore, we successfully access the response of an antenna embedded in a tooth, mimicking a dental implant. With a diameter of~0.2 mm, these antennas are readily implantable using standard medical syringes, highlighting their suitability for in-body implant applications.

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Versatile Approach for Integrative and Functionalized Tubes by Strain Engineering of Nanomembranes on Polymers

Cited by 619 publications

References 51 publications

Hierarchical nanoporous microtubes for high-speed catalytic microengines

Hierarchical nanoporous microtubes for high-speed catalytic microengines

Hyperlenses and metalenses for far-field super-resolution imaging

Compact helical antenna for smart implant applications

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