3-D conformal graphene for stretchable and bendable transparent conductive film

Song, Xianlin; Yang, Jun; Ran, Qincui; Wei, Dapeng; Fang, Liang; Shi, Haofei; Du, Chunlei

doi:10.1039/c5tc02906f

Cited by 14 publications

(20 citation statements)

References 41 publications

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“…In order to ensure the flexibility of the flexible pressure sensor, the materials used are all inherently flexible or are made into low-dimensional materials to achieve the purpose of flexibility. The commonly used flexible substrate materials are PDMS [ 13 , 42 , 43 ], PI [ 38 , 44 ], PU [ 45 ], PET [ 39 , 46 ], and other polymer materials. This is due to the fact that these polymer materials have stable performance and long polymer chains making the material tough and strong while ensuring flexibility.…”

Section: Fundamental Designs Of Flexible Pressure Sensorsmentioning

confidence: 99%

Force-Sensitive Interface Engineering in Flexible Pressure Sensors: A Review

Tai

Wei

et al. 2022

Sensors

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Flexible pressure sensors have received extensive attention in recent years due to their great importance in intelligent electronic devices. In order to improve the sensing performance of flexible pressure sensors, researchers are committed to making improvements in device materials, force-sensitive interfaces, and device structures. This paper focuses on the force-sensitive interface engineering of the device, which listing the main preparation methods of various force-sensitive interface microstructures and describing their respective advantages and disadvantages from the working mechanisms and practical applications of the flexible pressure sensor. What is more, the device structures of the flexible pressure sensor are investigated with the regular and irregular force-sensitive interface and accordingly the influences of different device structures on the performance are discussed. Finally, we not only summarize diverse practical applications of the existing flexible pressure sensors controlled by the force-sensitive interface but also briefly discuss some existing problems and future prospects of how to improve the device performance through the adjustment of the force-sensitive interface.

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Section: Fundamental Designs Of Flexible Pressure Sensorsmentioning

confidence: 99%

Force-Sensitive Interface Engineering in Flexible Pressure Sensors: A Review

Tai

Wei

et al. 2022

Sensors

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“…Graphene sheets prepared by chemical vapor deposition (CVD) or reduction of graphene oxide are commonly used to fabricate STCs; however, compared to the reduction of graphene oxide, CVD generally produces graphene sheets with low defect density . For example, an STC prepared by Song et al using CVD‐grown graphene showed R s of 195 Ω sq −1 , while another STC fabricated by the reduction of graphene oxide film exhibited resistance of higher than 57.82 kΩ sq −1 . Large‐scale transparent graphene film prepared by CVD and following mechanical transferring technique showed R s of only 30 Ω sq −1 .…”

Section: Micromechanics For Stretching Of Conducting Elements On Elasmentioning

confidence: 99%

“…Theoretically, freestanding graphene with single layer of carbon atoms can absorb only 2.3% of visible light due to its low energy electron structure (<1 eV), i.e., conical bands of electrons and holes meet near the Dirac point 23a,b. STCs based on graphene usually have high transmittance 5b,6a,52,53,55. For instance, an STC with graphene on PDMS showed transmittance of 84.2% when R s was 195 Ω sq −1 , while the transmittance increased to 96.9% when R s was 1140 Ω sq −1 .…”

Section: Micromechanics For Stretching Of Conducting Elements On Elasmentioning

confidence: 99%

“…STCs with out‐of‐plane buckled structures have been reported in the last years by depositing conducting elements on prestrained substrates or buckled templates, including wrinkled networks of AgNWs, curled CNT network,122c wrinkled5b,52 and crumpled6a graphene film, etc. The unfolding of buckled structures gives rise to high stretchability of STCs.…”

Section: Structure‐dependent Properties Of Stcsmentioning

confidence: 99%

“…Other approaches were also used to prepare buckled graphene structures. Song et al fabricated graphene film with buckled structure by depositing graphene on the surface of microstructured Cu foils via CVD. The prepared STC presented R s ranging from 195 to 1140 Ω sq −1 , transmittance varying from 84.2% to 96.9% at λ = 550 nm, and stable conductivity at tensile strain of 28–77.8% depending on the number of graphene layers.…”

Section: Structure‐dependent Properties Of Stcsmentioning

confidence: 99%

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Stretchable Transparent Conductors: from Micro/Macromechanics to Applications

Chen

Fang

et al. 2019

Advanced Materials

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electronics include stretchable solar cells, [2] stretchable organic light emitting diodes (OLEDs), [3] stretchable field-effect transistors (FETs), [4] stretchable supercapacitors, [5] stretchable actuators [6] and heaters, [7] etc. The emerging of stretchable electronics has foreseen the revolution of future electronics, ranging from design, shape and functions to installation, applications and even user experience. For example, stretchable optoelectronics, such as solar cells and OLEDs, are conformable, rollable and foldable. They can be installed on irregularly shaped roof or side walls of buildings, vehicles and other public utilities. Similarly, stretchable sensors used as e-skin can not only fit motions at joints of human or robots with tensile strain of large than 100%, [1e] but also sense signals related to strain, temperature, humidity and even blood pressure. [8] Moreover, the integration of different kinds of stretchable electronics may exhibit diversity in functions. [9] For instance, wearable devices of stretchable energy harvesting and storage electronics combining with stretchable sensors and heaters may sense the biomedical signal and keep the patient warm with the power collected from solar/friction energy. More potential applications of stretchable electronics in different fields, not restricted to the above examples, will be seen in the future.Stretchable transparent conductors (STCs) are fundamental components in stretchable electronics. They generally consist of a stretchable transparent polymeric substrate and a layer of conducting elements on or embedded in the substrate. The substrates involve poly(dimethyl siloxane) (PDMS) and polyacrylate-based elastomers [10] while the conducting elements include conducting polymers, [11] metal nanowires, [12] carbon nanotubes (CNTs), [13] graphene [14] or their hybrids. The substrates generally show transmittance of higher than 90% [15] and can be stretched to a strain of larger than 100%, e.g., PDMS and VHB (a typical acrylic elastomer) could exhibit a fracture tensile strain up to ≈160% [16] and several hundred percentages, [6a,17] respectively. STCs could be considered as the combination of transparent conductors and stretchable conductors; [18] they can simultaneously show stable conductivity and transparency upon deformation, including bending, folding, twisting, crumpling, stretching, etc. The transparency of STCs is attributed to the low attenuation of visible light by the substrate and the conducting layer. The conductivity is obtained due to the continuity of conducting layer either via uniform film or the connection of Stretchable transparent conductors (STCs), generally consisting of conducting networks and stretchable transparent elastomers, can maintain stable conductivity and transparency even at large tensile strain, beyond the reach of rigid/flexible transparent conductors. They are essential components in stretchable/wearable electronics for using on irregular 3D conformable surfaces and have attracted tremendous attention ...

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