Chris J. Sheehan

Polymer-Embedded Carbon Nanotube Ribbons for Stretchable Conductors

The creation of stretchable electronics is emerging as one of the most interesting research topics in materials science and technology. [ 1,2 ] Devices that are stretchable, foldable, and deformable into complex curvilinear shapes can enable many new applications that would be impossible to achieve by conventional rigid electronics. Examples of such applications range from fl exible displays, electronic eyeball cameras to stretchable electronic implants and conformable skin sensors. [ 3–6 ]

Tailoring the Morphology of Carbon Nanotube Arrays: From Spinnable Forests to Undulating Foams

Directly spinning carbon nanotube (CNT) fibers from vertically aligned CNT arrays is a promising way for the application of CNTs in the field of high-performance materials. However, most of the reported CNT arrays are not spinnable. In this work, by controlling catalyst pretreatment conditions, we demonstrate that the degree of spinnability of CNTs is closely related to the morphology of CNT arrays. Shortest catalyst pretreatment time led to CNT arrays with the best spinnability, while prolonged pretreatment resulted in coarsening of catalyst particles and nonspinnable CNTs. By controlling the coalescence of catalyst particles, we further demonstrate the growth of undulating CNT arrays with uniform and tunable waviness. The CNT arrays can be tuned from well-aligned, spinnable forests to uniformly wavy, foam-like films. To the best of our knowledge, this is the first systematical study on the correlation between catalyst pretreatment, CNT morphology, and CNT spinnability.

Biaxially textured cobalt-doped BaFe2As2 films with high critical current density over 1 MA/cm2 on MgO-buffered metal-tape flexible substrates

High critical current densities (Jc)>1 MA/cm2 were realized in cobalt-doped BaFe2As2 (BaFe2As2:Co) films on flexible metal substrates with biaxially textured MgO base-layers fabricated by an ion-beam assisted deposition technique. The BaFe2As2:Co films showed small in-plane crystalline misorientations (ΔϕBaFe2As2:Co) of ∼3° regardless of twice larger misorientations of the MgO base-layers (ΔϕMgO=7.3°), and exhibited high self-field Jc up to 3.5 MA/cm2 at 2 K. These values are comparable to that on MgO single crystals and the highest Jc among iron pnictide superconducting tapes and wires ever reported. High in-field Jc suggests the existence of c-axis correlated vortex pinning centers.

Iron-chalcogenide FeSe0.5Te0.5 coated superconducting tapes for high field applications

The high upper critical field characteristic of the recently discovered iron-based superconducting chalcogenides opens the possibility of developing a new type of non-oxide high-field superconducting wires. In this work, we utilize a buffered metal template on which we grow a textured FeSe

Solution deposition planarization of long-length flexible substrates

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Reel-to-reel preparation of ion-beam assisted deposition (IBAD)-MgO based coated conductors

Te

Quantum Optical Signature of Plasmonically Coupled Nanocrystal Quantum Dots

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Scale Up of Coated Conductor Substrate Process by Reel-to-Reel Planarization of Amorphous Oxide Layers

layer, an approach developed originally for high temperature superconducting coated conductors. These tapes carry high critical current densities (>1

Reactive Co-Evaporation of YBCO as a Low-Cost Process for Fabricating Coated Conductors

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Pushing Coated Conductor Critical Currents Beyond 1 kA per cm Width: Stacks of YBCO Layers

A/cm