2018
DOI: 10.1002/adma.201800888
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Camphor‐Enabled Transfer and Mechanical Testing of Centimeter‐Scale Ultrathin Films

Abstract: Camphor is used to transfer centimeter-scale ultrathin films onto custom-designed substrates for mechanical (tensile) testing. Compared to traditional transfer methods using dissolving/peeling to remove the support-layers, camphor is sublimed away in air at low temperature, thereby avoiding additional stress on the as-transferred films. Large-area ultrathin films can be transferred onto hollow substrates without damage by this method. Tensile measurements are made on centimeter-scale 300 nm-thick graphene oxid… Show more

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Cited by 33 publications
(43 citation statements)
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“…However, the intrinsic strength has been found only at the micrometer‐length scale. We recently used a new method to measure the mechanical strength of multi‐centimeter single‐layer graphene grown by chemical vapor deposition (CVD); the average strength of those macroscale samples was 4.5 GPa, and the average Young's modulus was 793 GPa . To date, macroscale samples made of only stacked and overlapped graphene platelets (no other constituents) had Young's moduli lower than 50 GPa and fracture strengths of around 100 MPa .…”
Section: Measured Interlayer Spacing Of Graphene Layers In Each Samplmentioning
confidence: 99%
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“…However, the intrinsic strength has been found only at the micrometer‐length scale. We recently used a new method to measure the mechanical strength of multi‐centimeter single‐layer graphene grown by chemical vapor deposition (CVD); the average strength of those macroscale samples was 4.5 GPa, and the average Young's modulus was 793 GPa . To date, macroscale samples made of only stacked and overlapped graphene platelets (no other constituents) had Young's moduli lower than 50 GPa and fracture strengths of around 100 MPa .…”
Section: Measured Interlayer Spacing Of Graphene Layers In Each Samplmentioning
confidence: 99%
“…We found it was not possible to realize the transfer by the widely used “polymer‐assisted” wet transfer method as the high surface tension of the liquid (water or acetone) broke the film in the regions it was not supported by the substrate. Our recently discovered “camphor‐enabled” transfer method was instead used to transfer the film from Cu foil to the hollow graphite plate successfully as shown in Figure a . A solid camphor layer was first deposited on the SG400 film on a Cu foil as a support, and the Cu was etched away.…”
Section: Measured Interlayer Spacing Of Graphene Layers In Each Samplmentioning
confidence: 99%
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“…By patterning graphene field effect transistors with the device channel in the 'clean' regions between adjacent folds, high-performance devices with carrier mobilities of around 1.0 × 10 4 cm 2 V -1 s -1 have been achieved without the disturbance of adlayers, GBs, and folds, which are all found to decrease the carrier mobilities. Using the camphor-assisted transfer method, the mechanical properties of a centimeter-scale single-crystal graphene film were measured, revealing a Young's modulus of 728-908 GPa and an average fracture strength of 4.5 GPa [25]. Such a graphene film, without any GBs and adlayers, is essential for constructing 'stacked graphene single crystals' with controlled rotation angles and number of layers by a layer-by-layer assembly method, which we will discuss later.…”
Section: Single-crystal Slg Grown From Multiple Nucleimentioning
confidence: 99%
“…As revealed by a Raman optothermal technique, [ 147 ] the bilayer graphene has a high thermal conductivity of ≈2300 W m −1 K −1 (Figure 13o). Its mechanical properties were characterized after being transferred using a camphor‐assisted method, [ 148 ] showing an average Young's modulus of 478 GPa and a fracture strength of 3.31 GPa. In addition, such AB‐stacked bilayer graphene film on single‐crystal Cu/Ni alloy substrate can be converted into a “diamond‐like” single‐layer carbon material (diamane) by fluorination.…”
Section: Growth On Single‐crystal Cu/ni Substratesmentioning
confidence: 99%