Wafer-scale Reduced Graphene Oxide Films for Nanomechanical Devices

Robinson, Jeremy T.; Zalalutdinov, Maxim; Baldwin, Jeffrey W.; Snow, E. S.; Wei, Zhongqing; Sheehan, Paul E.; Houston, Brian H.

doi:10.1021/nl8023092

Cited by 407 publications

(340 citation statements)

References 31 publications

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“…however, it was not delineated whether the increase in Q found by Robinson et al 8 as compared to the suspended graphene multilayers tested earlier 5,7 occurred due to the tensile stress, or due to the boundary conditions in which all edges of the multilayer graphene oxide sheet were fixed.…”

Section: Resultsmentioning

confidence: 91%

“…In particular, we study circular monolayer graphene sheets that are similar geometrically to the circular multilayer graphene oxide sheets that have recently been fabricated and tested 8 , and where extremely high Q-factors with values up to 4000 have been found. In addition, the graphene oxide multilayers studied by Robinson et al 8 were under tensile stress, which has recently proven beneficial in enhancing the Q-factors of both metallic 18 and semiconducting nanowires 19,20,21 ;…”

Section: Resultsmentioning

confidence: 99%

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The Importance of Edge Effects on the Intrinsic Loss Mechanisms of Graphene Nanoresonators

2009

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We utilize classical molecular dynamics simulations to investigate the intrinsic loss mechanisms of monolayer graphene nanoresonators undergoing flexural oscillations. We find that spurious edge modes of vibration, which arise not due to externally applied stresses but intrinsically due to the different vibrational properties of edge atoms, are the dominant intrinsic loss mechanism that reduces the Q-factors. We additionally find that while hydrogen passivation of the free edges is ineffective in reducing the spurious edge modes, fixing the free edges is critical to removing the spurious edge-induced vibrational states. Our atomistic simulations also show that the Q-factor degrades inversely proportional to temperature; furthermore, we also demonstrate that the intrinsic losses can be reduced significantly across a range of operating temperatures through the application of tensile mechanical strain.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

The Importance of Edge Effects on the Intrinsic Loss Mechanisms of Graphene Nanoresonators

2009

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“…[10][11][12][13] Because of the liquid-phaseprocessing feasibility, large-area and mechanically robust GO laminates with controllable thicknesses can be readily prepared via a series of liquid-phase membrane assembly techniques, such as drop-casting, 14,15 vacuum filtration 16,17 and spin-coating. 18,19 In view of the structure of GO, various oxygen-containing functional groups (for example, hydroxyl, epoxy, carbonyl and carboxyl) decorate the graphene basal plane and its edges, resulting in numerous sp 2 aromatic clusters isolated within the sp 3 C-O matrix. 20,21 On the basis of this unique structure, nanochannels for selective mass transport can be readily constructed by taking full advantage of the interlayer galleries between adjacent GO nanosheets (NS) within the lamellar membranes.…”

Section: Introductionmentioning

confidence: 99%

Highly selective charge-guided ion transport through a hybrid membrane consisting of anionic graphene oxide and cationic hydroxide nanosheet superlattice units

Sun

et al. 2016

NPG Asia Mater

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The development of graphene-based functional membranes with the ability to effectively filter and separate molecules or ions in solutions based on a simple criterion (for example, the size or charge of solutes) is crucial for various engineering-relevant applications, ranging from wastewater purification and reuse to chemical refinement. Here, we report a hybrid membrane consisting of anionic graphene oxide (GO) and cationic Co-Al (or Mg-Al) layered double hydroxide (LDH) nanosheet (NS) superlattice units for high selectivity charge-guided ion transport. The hybrid membrane possesses a series of characteristics, including being easy to access, mechanically robust, freestanding, flexible and semitransparent as well as having a large area. The interlayer spacing of the hybrid membrane is insensitive to humidity variations, ensuring the structural stability in solution-based mass transport applications. The concentration gradient-driven ion transmembrane diffusion experiments show that the cations bearing various valences can be effectively separated strictly according to their charges, independent of the cationic and charge-balancing anionic species. The relative selectivity of the hybrid membranes toward monovalent and trivalent cations is as high as 30, which is not achievable by GO multilayer stacks, LDH-NS multilayer stacks or their bulk-stratified membranes, indicating that a synergistic effect originating from the molecular-level heteroassembly of GO and LDH-NS has a dominant role in the high-performance charge-guided ion filtration and separation processes. These excellent properties of GO/LDH-NS hybrid membranes make them promising candidates in diverse applications, ranging from wastewater treatment and reuse and chemical refinement to biomimetic selective ion transport.

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“…[48][49][50][51] Graphene resonators exhibit slightly higher Q factors from several hundred [52][53][54] to over a thousand, 55,56 while graphene oxide has even higher Q factor of 4000. 57 Recently, Q factors as high as 10 5 were demonstrated for graphene membranes. 58 Si is often used in MEMS, with the reported Q-factors for silicon resonators of the order of 1.4-1.6 Â 10 5 .…”

Section: Membrane Vibrational Propertiesmentioning

confidence: 99%

High quality single crystal Ge nano-membranes for opto-electronic integrated circuitry

Shah

Rhead

Halpin

et al. 2014

Journal of Applied Physics

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Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-forprofit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher's statement:Copyright ( A note on versions:The version presented in WRAP is the published version or, version of record, and may be cited as it appears here.For more information, please contact the WRAP A thin, flat, and single crystal germanium membrane would be an ideal platform on which to mount sensors or integrate photonic and electronic devices, using standard silicon processing technology. We present a fabrication technique compatible with integrated-circuit wafer scale processing to produce membranes of thickness between 60 nm and 800 nm, with large areas of up to 3.5 mm 2 . We show how the optical properties change with thickness, including appearance of Fabry-Perot type interference in thin membranes. The membranes have low Q-factors, which allow the platforms to counteract distortion during agitation and movement. Finally, we report on the physical characteristics showing sub-nm roughness and a homogenous strain profile throughout the freestanding layer, making the single crystal Ge membrane an excellent platform for further epitaxial growth or deposition of materials. V C 2014 AIP Publishing LLC. [http://dx

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Wafer-scale Reduced Graphene Oxide Films for Nanomechanical Devices

Cited by 407 publications

References 31 publications

The Importance of Edge Effects on the Intrinsic Loss Mechanisms of Graphene Nanoresonators

The Importance of Edge Effects on the Intrinsic Loss Mechanisms of Graphene Nanoresonators

Highly selective charge-guided ion transport through a hybrid membrane consisting of anionic graphene oxide and cationic hydroxide nanosheet superlattice units

High quality single crystal Ge nano-membranes for opto-electronic integrated circuitry

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