Fracture mechanism and electromechanical behavior of chemical vapor deposited graphene on flexible substrate under tension

Lee, Jeong‐Hwan; Jang, Dong-Won; Hong, Seongwon; Park, Byong Chon; Kim, Jae Hyun; Jung, Hyun-June; Lee, Soon-Bok

doi:10.1016/j.carbon.2017.03.081

Cited by 17 publications

(22 citation statements)

References 33 publications

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“…This fracture characteristic of the MPG sheet is consistent with the commonly observed fracture in tensile experiments of MPG sheets on copper and polyethylene terephthalate. 18,19 In comparison with the traditional SLF of an MPG sheet, the morphologies of necking-assisted fragmentation of the MPG sheet are shown in Figure 1E. To clearly observe the fracture morphology, we transferred the fragmented MPG sheet onto a Si/SiO 2 substrate (see Experimental Procedures); the fracture morphologies of the MPG sheet on the original PC substrate are also shown in Figures S2 and S3.…”

Section: Fragmentation Of Mpg Sheet On a Polydimethylsiloxane Substrate Versus On A Polycarbonate Substratementioning

confidence: 99%

“…17 Recently, cracking of a monolayer polycrystalline graphene (MPG) sheet on flexible substrates under tension has been achieved. 18,19 In these studies, fragmentation of the MPG sheet tends to initiate at those pre-existing random defects and occurs simultaneously over the entire graphene layer. Moreover, the density of the fragments increases with increasing strain, and the size of the graphene segments decreases as the strain…”

Section: Introductionmentioning

confidence: 99%

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Controlled Fragmentation of Single-Atom-Thick Polycrystalline Graphene

Chen

Wang

et al. 2020

Matter

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Controlled fragmentation of graphene is achieved by harnessing the necking process of the thermoplastic polymers. We have pushed the necking phenomenon to become a versatile and lithography-free fabrication tool to precisely ''cut'' graphene into ordered submicron ribbons on a large scale. The fabricated graphene ribbons have higher reactivity due to the numerous graphene edges formed, which can serve as an exceptional platform for the study of graphene edge chemistry. Furthermore, this method can be applied to various atomic-thin layered materials.

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Section: Fragmentation Of Mpg Sheet On a Polydimethylsiloxane Substrate Versus On A Polycarbonate Substratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlled Fragmentation of Single-Atom-Thick Polycrystalline Graphene

Chen

Wang

et al. 2020

Matter

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“…The sensor has a spider-slit-organ-inspired microcracked conductive thin film morphology with a unique “half-open, half-close” microcrack structure. This microcrack morphology of the FGM depends on the ductile fracture behavior of the FGM film under a small strain load ε of 2%, rather than brittle fracture, which is quite different from nonfunctionalized graphene. − In such FGMs, the random distribution of functionalized groups on carbon atoms causes irregular interactions among functionalized carbon atoms, and distinct fracture pathways in individual constitutive layers for suspended FGM films have also been reported using molecular dynamics simulation . Both factors result in complex localized strain fields in graphene layers, which inhibit the brittle propagation of the initial crack.…”

Section: Introductionmentioning

confidence: 89%

Accurate Monitoring of Small Strain for Timbre Recognition via Ductile Fragmentation of Functionalized Graphene Multilayers

Yang

Wang

Huang

et al. 2020

ACS Appl. Mater. Interfaces

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Sensitivity and linearity are two key parameters of flexible strain sensors. Although the introduction of microstructures (e.g., channel crack inspired by the geometry of the spider's slit organ) can effectively improve the sensitivity, the sudden breakage of the conductive path in turn leads to poor linearity. In practical applications, in order to achieve precise detection of subtle strains, high sensitivity and high linearity are required simultaneously. Here, we report a strain sensor design strategy based on the ductile fragmentation of functionalized graphene multilayers (FGMs) in which the conductive path is gradually broken to ensure high sensitivity while greatly improving the linear response of the sensor. The presence of oxygencontaining functional groups plays a key role in the deformation and fracture behaviors of the sensitive layer. High sensitivity (gauge factor ∼ 200) and high linearity (adjusted R-square ∼ 0.99936) have been achieved simultaneously in the strain range of 0−2.5%. In addition, the sensor also shows an ultralow detection limit (ε < 0.001%), an ultrafast response (response time ∼ 50 μs), good stability, and good patterning capability compatible with complex curved surface manufacturing. These outstanding performances allow the FGM-based strain sensors to accurately distinguish the sound amplitude and frequency, highlighting the sensor's potential as smart devices for human voice detection. Such sensors have potential applications in the fields of smart skin, wearable electronics, robotics, and so on.

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“…Controlling the interfacial adhesion between the graphene and the polymer substrate can be achieved by modulating the surface conditions such as its roughness. In this way the fracture mechanism of graphene can be altered [70].…”

Section: Nanoscale Interfacial Interactions Of Grm With the Polymer Mmentioning

confidence: 99%

Graphene and related materials in hierarchical fiber composites: Production techniques and key industrial benefits

Valorosi

Meo

Blanco-Varela

et al. 2020

Composites Science and Technology

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show abstract

Fracture mechanism and electromechanical behavior of chemical vapor deposited graphene on flexible substrate under tension

Cited by 17 publications

References 33 publications

Controlled Fragmentation of Single-Atom-Thick Polycrystalline Graphene

Controlled Fragmentation of Single-Atom-Thick Polycrystalline Graphene

Accurate Monitoring of Small Strain for Timbre Recognition via Ductile Fragmentation of Functionalized Graphene Multilayers

Graphene and related materials in hierarchical fiber composites: Production techniques and key industrial benefits

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