Journal ArticleDOI
Stretchable, Transparent Graphene Interconnects for Arrays of Microscale Inorganic Light Emitting Diodes on Rubber Substrates
Rak-Hwan Kim,Myung-Ho Bae,Dae Gon Kim,Huanyu Cheng,Bong Hoon Kim,Bong Hoon Kim,Dae-Hyeong Kim,Ming Li,Ming Li,Jian Wu,Frank Du,Hoon Kim,Stanley Kim,David Estrada,Suck Won Hong,Yonggang Huang,Eric Pop,John A. Rogers +17 more
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TLDR
The fabrication and design principles for using transparent graphene interconnects in stretchable arrays of microscale inorganic light emitting diodes (LEDs) on rubber substrates are described and several appealing properties of graphene are demonstrated, including its ability to spontaneously conform to significant surface topography.Abstract:
This paper describes the fabrication and design principles for using transparent graphene interconnects in stretchable arrays of microscale inorganic light emitting diodes (LEDs) on rubber substrates. We demonstrate several appealing properties of graphene for this purpose, including its ability to spontaneously conform to significant surface topography, in a manner that yields effective contacts even to deep, recessed device regions. Mechanics modeling reveals the fundamental aspects of this process, as well as the use of the same layers of graphene for interconnects designed to accommodate strains of 100% or more, in a completely reversible fashion. These attributes are compatible with conventional thin film processing and can yield high-performance devices in transparent layouts. Graphene interconnects possess attractive features for both existing and emerging applications of LEDs in information display, biomedical systems, and other environments.read more
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3D-Printed Flexible Tactile Sensor Mimicking the Texture and Sensitivity of Human Skin
Journal ArticleDOI
Highly stretchable patternable conductive circuits and wearable strain sensors based on polydimethylsiloxane and silver nanoparticles
Pengdong Feng,Hongjun Ji,Ling Zhang,Xuan Luo,Xuesong Leng,Peng He,Huanhuan Feng,Jiaheng Zhang,Xing Ma,Weiwei Zhao +9 more
TL;DR: Silver nanoparticles and liquid polydimethylsiloxane are mixed together to form liquid conductive adhesives (CAs) and devices fabricated from rhombus-pattern circuits are found to exhibit stable electrical conductivity when subjected to very high tensile strains.
Journal ArticleDOI
Graphene-based photonic devices for soft hybrid optoelectronic systems.
TL;DR: It is concluded that graphene-based photonic devices have huge potential for the development of next-generation human-friendly flexible optoelectronic systems.
Journal ArticleDOI
A facile synthesis of uniform Ag nanoparticle decorated CVD-grown graphene via surface engineering
TL;DR: In this article, a few-layer graphene was grown on Cu foil by chemical vapour deposition (CVD) method and functionalized with oxygen plasma treatment under controlled conditions, such as exposure time, input power and distance between the graphene and the plasma electrode.
Journal ArticleDOI
Three-dimensional thermal analysis of rectangular micro-scale inorganic light-emitting diodes integrated with human skin
TL;DR: In this paper, a three-dimensional analytical heat transfer model, validated by finite element analysis (FEA), is established to predict the temperature in the system of a rectangular micro-scale inorganic light-emitting diodes (μ-ILEDs) integrated with human skin.
References
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Electric Field Effect in Atomically Thin Carbon Films
Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
Journal ArticleDOI
Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
Xuesong Li,Weiwei Cai,Jinho An,Seyoung Kim,Junghyo Nah,Dongxing Yang,Richard D. Piner,Aruna Velamakanni,Inhwa Jung,Emanuel Tutuc,Sanjay K. Banerjee,Luigi Colombo,Rodney S. Ruoff +12 more
TL;DR: It is shown that graphene grows in a self-limiting way on copper films as large-area sheets (one square centimeter) from methane through a chemical vapor deposition process, and graphene film transfer processes to arbitrary substrates showed electron mobilities as high as 4050 square centimeters per volt per second at room temperature.
Journal ArticleDOI
Fine Structure Constant Defines Visual Transparency of Graphene
Rahul R. Nair,Peter Blake,Peter Blake,Alexander N. Grigorenko,K. S. Novoselov,Timothy J. Booth,Timothy J. Booth,Tobias Stauber,Tobias Stauber,Nuno M. R. Peres,Nuno M. R. Peres,A. K. Geim +11 more
TL;DR: It is shown that the opacity of suspended graphene is defined solely by the fine structure constant, a = e2/hc � 1/137 (where c is the speed of light), the parameter that describes coupling between light and relativistic electrons and that is traditionally associated with quantum electrodynamics rather than materials science.
Journal ArticleDOI
Roll-to-roll production of 30-inch graphene films for transparent electrodes
Sukang Bae,Hyeongkeun Kim,Youngbin Lee,Xiangfan Xu,Jaesung Park,Yi Zheng,Jayakumar Balakrishnan,Tian Lei,Hye Ri Kim,Young Il Song,Young Jin Kim,Kwang S. Kim,Barbaros Özyilmaz,Jong Hyun Ahn,Byung Hee Hong,Sumio Iijima,Sumio Iijima +16 more
TL;DR: The roll-to-roll production and wet-chemical doping of predominantly monolayer 30-inch graphene films grown by chemical vapour deposition onto flexible copper substrates are reported, showing high quality and sheet resistances superior to commercial transparent electrodes such as indium tin oxides.
Journal ArticleDOI
Raman spectroscopy in graphene
TL;DR: In this article, the authors discuss the first-order and double resonance Raman scattering mechanisms in graphene, which give rise to the most prominent Raman features and give special emphasis to the possibility of using Raman spectroscopy to distinguish a monolayer from few-layer graphene stacked in the Bernal configuration.