Freestanding ultrathin nano-membranes via self-assembly

Cheng, Wenlong; Campolongo, Michael J.; Tan, Shawn J.; Luo, Dan

doi:10.1016/j.nantod.2009.10.005

Cited by 145 publications

(151 citation statements)

References 78 publications

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“…3 Apparently, there is a growing focus on freestanding nanomembranes (NMs) that are prepared by means of a variety of emerging approaches, such as organic synthesis, 4 bottom-up self-assembly, 5,6 and top-down thinning and shaping. 7,8 Understanding the mechanical motion of a NM in the regime of nanoscale thickness is of fundamental importance and also essential for potential applications in the NEMS as building blocks.…”

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confidence: 99%

Vibrational modes of ultrathin carbon nanomembrane mechanical resonators

Zhang

Waitz

Yang

et al. 2015

Applied Physics Letters

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We report measurements of vibrational mode shapes of mechanical resonators made from ultrathin carbon nanomembranes (CNMs) with a thickness of approximately 1 nm. CNMs are prepared from electron irradiation induced cross-linking of aromatic self-assembled monolayers and the variation of membrane thickness and/or density can be achieved by varying the precursor molecule. Singleand triple-layer freestanding CNMs were made by transferring them onto Si substrates with square/ rectangular orifices. The vibration of the membrane was actuated by applying a sinusoidal voltage to a piezoelectric disk on which the sample was glued. The vibrational mode shapes were visualized with an imaging Mirau interferometer using a stroboscopic light source. Several mode shapes of a square membrane can be readily identified and their dynamic behavior can be well described by linear response theory of a membrane with negligible bending rigidity. By applying Fourier transformations to the time-dependent surface profiles, the dispersion relation of the transverse membrane waves can be obtained and its linear behavior verifies the membrane model. By comparing the dispersion relation to an analytical model, the static stress of the membranes was determined and found to be caused by the fabrication process. V C 2015 AIP Publishing LLC.

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confidence: 99%

Vibrational modes of ultrathin carbon nanomembrane mechanical resonators

Zhang

Waitz

Yang

et al. 2015

Applied Physics Letters

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“…1À6 Various approaches have been suggested for the fabrication of free-standing nanomembranes based on organic polymers and/or inorganic materials: spin-casting of films, layer-by-layer assembly of polyelectrolyte multilayers, 8 cross-linking of self-assembled monolayers, 9 and assembly of triblock copolymers. 10,11 Loading materials such as gold nanoparticles 12 or carbon nanotubes 13 make membranes robust and electrically conductive.…”

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confidence: 99%

Hybrid Nanomembranes for High Power and High Energy Density Supercapacitors and Their Yarn Application

et al. 2011

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Ultrathin (thicknessnm) electrically conducting membranes can be used as electrodes for sensors, actuators, optical devices, fuel cells, scaffolds for assembling nanoparticles, and separation of biological macromolecules.1-6 Various approaches have been suggested for the fabrication of free-standing nanomembranes based on organic polymers and/or inorganic materials: spin-casting of films,7 layer-by-layer assembly of polyelectrolyte multilayers,8 cross-linking of self-assembled monolayers,9 and assembly of triblock copolymers.10,11 Loading materials such as gold nanoparticles12 or carbon nanotubes13 make membranes robust and electrically conductive. However, these methods are often time-consuming and have some limitations in terms of achievable electrical and electrochemical membrane performance as well as scaleup. Alternative approaches are needed for the preparation of mechanically robust, free-standing, conductive nanomembranes that could be easily manufactured. ABSTRACTWe report mechanically robust, electrically conductive, free-standing, and transparent hybrid

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“…Free-standing thin polymer films are used in a variety of applications including sensors, [1][2][3] MEMs, catalysis or filtration, 4 and tissue engineering. [5][6][7][8] They are also used for fundamental studies exploring the behavior of polymers under confinement.…”

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confidence: 99%

Fabrication of Large-area Free-standing Ultrathin Polymer Films

Stadermann

Baxamusa

Aracne‐Ruddle

et al. 2015

JoVE

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This procedure describes a method for the fabrication of large-area and ultrathin free-standing polymer films. Typically, ultrathin films are prepared using either sacrificial layers, which may damage the film or affect its mechanical properties, or they are made on freshly cleaved mica, a substrate that is difficult to scale. Further, the size of ultrathin film is typically limited to a few square millimeters. In this method, we modify a surface with a polyelectrolyte that alters the strength of adhesion between polymer and deposition substrate. The polyelectrolyte can be shown to remain on the wafer using spectroscopy, and a treated wafer can be used to produce multiple films, indicating that at best minimal amounts of the polyelectrolyte are added to the film. The process has thus far been shown to be limited in scalability only by the size of the coating equipment, and is expected to be readily scalable to industrial processes. In this study, the protocol for making the solutions, preparing the deposition surface, and producing the films is described. Video LinkThe video component of this article can be found at

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Freestanding ultrathin nano-membranes via self-assembly

Cited by 145 publications

References 78 publications

Vibrational modes of ultrathin carbon nanomembrane mechanical resonators

Vibrational modes of ultrathin carbon nanomembrane mechanical resonators

Hybrid Nanomembranes for High Power and High Energy Density Supercapacitors and Their Yarn Application

Fabrication of Large-area Free-standing Ultrathin Polymer Films

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