Journal ArticleDOI
Stretchable nanoparticle conductors with self-organized conductive pathways
Yoonseob Kim,Jian Zhu,Bongiun Yeom,Matthew Di Prima,Xianli Su,Jin-Gyu Kim,Seung-Ho Jo Yoo,Ctirad Uher,Nicholas A. Kotov +8 more
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TLDR
Stretchable conductors of polyurethane containing spherical nanoparticles deposited by either layer-by-layer assembly or vacuum-assisted flocculation are demonstrated, demonstrating the electronic tunability of mechanical properties, which arise from the dynamic self-organization of the nanoparticles under stress.Abstract:
Research in stretchable conductors is fuelled by diverse technological needs. Flexible electronics, neuroprosthetic and cardiostimulating implants, soft robotics and other curvilinear systems require materials with high conductivity over a tensile strain of 100 per cent (refs 1-3). Furthermore, implantable devices or stretchable displays need materials with conductivities a thousand times higher while retaining a strain of 100 per cent. However, the molecular mechanisms that operate during material deformation and stiffening make stretchability and conductivity fundamentally difficult properties to combine. The macroscale stretching of solids elongates chemical bonds, leading to the reduced overlap and delocalization of electronic orbitals. This conductivity-stretchability dilemma can be exemplified by liquid metals, in which conduction pathways are retained on large deformation but weak interatomic bonds lead to compromised strength. The best-known stretchable conductors use polymer matrices containing percolated networks of high-aspect-ratio nanometre-scale tubes or nanowires to address this dilemma to some extent. Further improvements have been achieved by using fillers (the conductive component) with increased aspect ratio, of all-metallic composition, or with specific alignment (the way the fillers are arranged in the matrix). However, the synthesis and separation of high-aspect-ratio fillers is challenging, stiffness increases with the volume content of metallic filler, and anisotropy increases with alignment. Pre-strained substrates, buckled microwires and three-dimensional microfluidic polymer networks have also been explored. Here we demonstrate stretchable conductors of polyurethane containing spherical nanoparticles deposited by either layer-by-layer assembly or vacuum-assisted flocculation. High conductivity and stretchability were observed in both composites despite the minimal aspect ratio of the nanoparticles. These materials also demonstrate the electronic tunability of mechanical properties, which arise from the dynamic self-organization of the nanoparticles under stress. A modified percolation theory incorporating the self-assembly behaviour of nanoparticles gave an excellent match with the experimental data.read more
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Journal ArticleDOI
Self-healable printed magnetic field sensors using alternating magnetic fields
Rui Xu,Gilbert Santiago Cañón Bermúdez,Oleksandr V. Pylypovskyi,Oleksii M. Volkov,Eduardo Sergio Oliveros Mata,Y. Zabila,Rico Illing,Pavlo Makushko,P. Milkin,Leonid Ionov,Jürgen Fassbender,Denys Makarov +11 more
TL;DR: In this article , the authors employed alternating magnetic fields (AMF) to drive magnetic fillers actively and guide the formation and self-healing of percolation networks, and fabricated printable magnetoresistive sensors revealing an enhancement in sensitivity and figure of merit of more than one and two orders of magnitude relative to previous reports.
Proceedings ArticleDOI
Stretchable conducting materials with multi-scale hierarchical structures for biomedical applications
Hyun Kim,Bong Sup Shim +1 more
TL;DR: In this paper, a stretchable and electrically conductive material with complex hierarchical structures; multi-scale microstructures and nanostructural electrical pathways was developed for implantable polycaprolactone (PCL) membrane was coated by molecularly controlled layer-by-layer assembly of single-walled carbon nanotubes (SWNTs) or poly(3,4-ethylenedioxythiophene) (PEDOT).
DissertationDOI
Role of Carboxylate ligands in the Synthesis of AuNPs: Size Control, Molecular Interaction and Catalytic Activity
TL;DR: The role of Carboxylate ligands in the Synthesis of AuNPs: Size Control, Molecular Interaction and Catalytic Activity is studied.
Journal ArticleDOI
Sustained Percolation in Stretched Silver Nanowire Networks for Stretchable Inter-Connection Applications
Jae Sung Park,Woo Soo Kim +1 more
TL;DR: In this article, a highly stretchable printed circuit board (PCB) interconnection technology achieved through the combination of flexibility allowed by the silver nanowire (AgNW)-based electrode and stretchability provided by the meander-shaped substrate.
Book ChapterDOI
Nanotechnology-enabled polymer-based flexible electronics and their potential applications
B.J. Kishen Karumbaiah,K.S. Nithin,K.R. Prakash,V. Ravi Kumar,V. Ravi Kumar,K.N. Shilpa,T. Basava,P. Shruthi,S. Sachhidananda +8 more
TL;DR: In this paper, the authors highlight the recent developments in the field of flexible electronics, with special emphasis on important applications of such nanotechnology-enabled polymer-based smart materials, and highlight the potential of such materials in structural health monitoring and personalized healthcare.
References
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Journal ArticleDOI
Carbon Nanotubes--the Route Toward Applications
TL;DR: Many potential applications have been proposed for carbon nanotubes, including conductive and high-strength composites; energy storage and energy conversion devices; sensors; field emission displays and radiation sources; hydrogen storage media; and nanometer-sized semiconductor devices, probes, and interconnects.
Journal ArticleDOI
Fuzzy Nanoassemblies: Toward Layered Polymeric Multicomposites
TL;DR: In this article, a general approach for multilayers by consecutive adsorption of polyanions and polycations has been proposed and has been extended to other materials such as proteins or colloids.
Journal ArticleDOI
Materials and mechanics for stretchable electronics
TL;DR: Inorganic and organic electronic materials in microstructured and nanostructured forms, intimately integrated with elastomeric substrates, offer particularly attractive characteristics, with realistic pathways to sophisticated embodiments, and applications in systems ranging from electronic eyeball cameras to deformable light-emitting displays are described.
Journal ArticleDOI
Skin-like pressure and strain sensors based on transparent elastic films of carbon nanotubes
Darren J. Lipomi,Michael Vosgueritchian,Benjamin C. K. Tee,Sondra L. Hellstrom,Jennifer A. Lee,Courtney H. Fox,Zhenan Bao +6 more
TL;DR: Transparent, conducting spray-deposited films of single-walled carbon nanotubes are reported that can be rendered stretchable by applying strain along each axis, and then releasing this strain.
Journal ArticleDOI
Stretchable active-matrix organic light-emitting diode display using printable elastic conductors
Tsuyoshi Sekitani,Hiroyoshi Nakajima,Hiroki Maeda,Takanori Fukushima,Takuzo Aida,Kenji Hata,Takao Someya +6 more
TL;DR: The manufacture of printable elastic conductors comprising single-walled carbon nanotubes (SWNTs) uniformly dispersed in a fluorinated rubber is described, which is constructed a rubber-like stretchable active-matrix display comprising integrated printed elastic conductor, organic transistors and organic light-emitting diodes.