- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Highly Stretchable, High‐Mobility, Free‐Standing All‐Organic Transistors Modulated by Solid‐State Elastomer Electrolytes
摘要： Highly stretchable, high-mobility, and free-standing coplanar-type all-organic transistors based on deformable solid-state elastomer electrolytes are demonstrated using ionic thermoplastic polyurethane (i-TPU), thereby showing high reliability under mechanical stimuli as well as low-voltage operation. Unlike conventional ionic dielectrics, the i-TPU electrolyte prepared herein has remarkable characteristics, i.e., a large specific capacitance of 5.5 μF cm?2, despite the low weight ratio (20 wt%) of the ionic liquid, high transparency, and even stretchability. These i-TPU-based organic transistors exhibit a mobility as high as 7.9 cm2 V?1 s?1, high bendability (Rc, radius of curvature: 7.2 mm), and good stretchability (60% tensile strain). Moreover, they are suitable for low-voltage operation (VDS = ?1.0 V, VGS = ?2.5 V). In addition, the electrical characteristics such as mobility, on-current, and threshold voltage are maintained even in the concave and convex bending state (bending tensile strain of ≈3.4%), respectively. Finally, free-standing, fully stretchable, and semi-transparent coplanar-type all-organic transistors can be fabricated by introducing a poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid layer as source/drain and gate electrodes, thus achieving low-voltage operation (VDS = ?1.5 V, VGS = ?2.5 V) and an even higher mobility of up to 17.8 cm2 V?1 s?1. Moreover, these devices withstand stretching up to 80% tensile strain.
关键词： free-standing all-organic transistors,stretchable and conformal electronics,high-mobility,elastomer electrolyte,low-voltage operation
更新于2025-11-14 17:28:48
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Sacrificial Layer Technique for Releasing Metallized Multilayer SU-8 Devices
摘要： The low fabrication cost of SU-8-based devices has opened the fields of point-of-care devices (POC), μTAS and Lab-on-Chip technologies, which call for cheap and disposable devices. Often this translates to free-standing, suspended devices and a reusable carrier wafer. This necessitates a sacrificial layer to release the devices from the substrates. Both inorganic (metals and oxides) and organic materials (polymers) have been used as sacrificial materials, but they fall short for fabrication and releasing multilayer SU-8 devices. We propose photoresist AZ 15nXT (MicroChemicals GmbH, Ulm, Germany) to be used as a sacrificial layer. AZ 15nXT is stable during SU-8 processing, making it suitable for fabricating free-standing multilayer devices. We show two methods for cross-linking AZ 15nXT for stable sacrificial layers and three routes for sacrificial release of the multilayer SU-8 devices. We demonstrate the capability of our release processes by fabrication of a three-layer free-standing microfluidic electrospray ionization (ESI) chip and a free-standing multilayer device with electrodes in a microchannel.
关键词： microfabrication,microfluidics,free standing,microchips,SU-8,sacrificial release,multi layered chips,AZ 15nXT
更新于2025-09-23 15:23:52
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Free-standing highly conducting PEDOT films for flexible thermoelectric generator
摘要： Recently, organic thermoelectric (TE) materials especially conducting polymers have attracted increasing attention. In this work, we successfully synthesized ultrafine poly (3,4-ethylenedioxythiophene) (PEDOT) nanowires (NWs) (~10 nm) by a simple self-assembled micellar soft-template method and then obtain highly flexible free-standing PEDOT NW films by vacuum-assisted filtration. The films are with very high electrical conductivity (~1340 S cm?1). After being treated with 6 M H?SO? and then with 1 M NaOH at room temperature, the film shows an enhanced power factor of 46.51 μW m?1 K?2 (Seebeck coefficient of 25.5 μV K?1, electrical conductivity of 715.3 S cm?1), which increases by 54% compared with that of the pristine film. To the best of our knowledge, it outperforms the TE performance of all reported one-dimensional conducting polymer-based films. In addition, the TE performance of the film almost remains unchanged even after being bent for 200 times, indicating excellent flexibility. A flexible TE prototype composed of six strips (7 mm × 30 mm) of the as-prepared PEDOT NW films connected in series shows an output power of 157.2 nW at a temperature difference of 51.6 K. The free-standing PEDOT NW films show promise to a new generation of wearable TE devices.
关键词： Flexible,Thermoelectric,Free-standing,PEDOT,Highly conductive
更新于2025-09-23 15:23:52
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Micro Grating Deposition on Non-Planar Surfaces by Polymer-Assisted Transfer Printing
摘要： By spin-coating a few hundred of nanometer thick poly(methyl methacrylate) (PMMA) film on a micron or a sub-micron scale structure, the structure can be transferred on an arbitrary substrate. More precisely, by using a thin PMMA support layer and releasing the structure from the transient substrate into water, the PMMA with the structure can be collected on a desired substrate. Here, this technique is demonstrated to be suitable for transferring metallic binary grating and few-layer Bragg gratings from flat substrates onto 3D-printed convex lenses. Moreover, the thin PMMA film is sufficiently strong to support centimeter size free-standing areas. This enables fabrication of 1.5 μm thick, free-standing structure of a Bragg-grating with PMMA. Thus, the presented technique provides a powerful tool for transfer printing of micron scale structures.
关键词： transfer printing,non-planar surfaces,free-standing structures,microstructure transfer
更新于2025-09-23 15:23:52
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Doping modulation of quasi-free-standing monolayer graphene formed on SiC(0001) through Sn1-Ge intercalation
摘要： In order to modulate the transfer doping of quasi-free-standing monolayer graphene (QFMLG) formed on SiC(0001), Ge atoms were intercalated additionally into QFMLG already formed by Sn intercalation between ZL and 6H-SiC(0001). By postannealing the Ge-deposited surface at 600 °C, the Sn1-xGex film with the 4 × √3 structure, composed of a bilayer and adatoms with dangling bonds under QFMLG, has been formed. It turns out that, in this Sn1-xGex film, Ge atoms preferentially occupy the bottom layer bound to the top Si atoms of the substrate, while Sn atoms occupy the top adatom sites. Strong correlation among the electrons localized at these adatom sites induces a semiconducting alloy film. As the postannealing temperature is increased up to 800 °C, the concentration of Ge in the intercalated film of the same 4 × √3 structure is gradually increased and the Dirac point also shifts gradually from ?0.16 eV to +0.20 eV relative to the Fermi level. Such a result confirms that the transfer doping of QFMLG on SiC(0001) has been modulated by varying the alloy composition of the Sn1-xGex interfacial film.
关键词： Scanning tunneling microscopy,Quasi-free-standing graphene,SnGe alloy intercalation,Hubbard band,Doping modulation,Photoemission spectroscopy,SiC(0001)
更新于2025-09-23 15:23:52
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Free-Standing Complementary Asymmetric Metasurface for Terahertz Sensing Applications
摘要： We designed and tested a highly sensitive metasurface device based on free-standing complementary asymmetric split-ring resonators at terahertz frequencies. It is utilized for sensing a galactose film. We characterized the device using the induced red shift of a Fano resonance observed in the THz transmission. The sensor has a high sensitivity of 91.7 GHz/RIU due to a significant interaction between the galactose overlayer and the metasurface.
关键词： terahertz,asymmetric split-ring resonators,sensing,free-standing
更新于2025-09-23 15:19:57
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Nanofibrous Kevlar Aerogel Films and Their Phase-Change Composites for Highly Efficient Infrared Stealth
摘要： Infrared (IR) stealth is essential not only in high technology and modern military but also in fundamental material science. However, effectively hiding targets and rendering them invisible to thermal infrared detectors have been great challenges in past decades. Herein, flexible, foldable, and robust Kevlar nanofiber aerogel (KNA) films with high porosity and specific surface area were fabricated first. The KNA films display excellent thermal insulation performance and can be employed to incorporate with phase-change materials (PCMs), such as polyethylene glycol, to fabricate KNA/PCM composite films. The KNA/PCM films with high thermal management capability and infrared emissivity comparable to that of various backgrounds demonstrate high performance in IR stealth in outdoor environments with solar illumination variations. To further realize hiding hot targets from IR detection, combined structures constituted of thermal insulation layers (KNA films) and ultralow IR transmittance layers (KNA/PCM) are proposed. A hot target covered with this combined structure becomes completely invisible in infrared images. Such KNA/PCM films and KNA?KNA/PCM combined structures hold great promise for broad applications in infrared thermal stealth.
关键词： thermal management,aerogel,phase-change materials,free-standing films,Kevlar nanofibers,infrared stealth
更新于2025-09-19 17:15:36
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In-Line Target Production for Laser IFE
摘要： The paper presents the results of mathematical and experimental modeling of in-line production of inertial fusion energy (IFE) targets of a reactor-scaled design. The technical approach is the free-standing target (FST) layering method in line-moving spherical shells. This includes each step of the fabrication and injection processes in the FST transmission line (FST-TL) considered as a potential solution of the problem of mass target manufacturing. Finely, we discuss the development strategy of the FST-TL creation seeking to develop commercial power production based on laser IFE.
关键词： free-standing target layering,inertial fusion energy,FST transmission line
更新于2025-09-16 10:30:52
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[IEEE 2018 IEEE 4th International Forum on Research and Technology for Society and Industry (RTSI) - Palermo, Italy (2018.9.10-2018.9.13)] 2018 IEEE 4th International Forum on Research and Technology for Society and Industry (RTSI) - Conductive Free Standing Polymer Paste Synthesized by Acid Induced Phase Separation
摘要： PEDOT:PSS is one of the most studied and used polymers. The current literature shows that this material is employed in solar cells, electrochemical cells, devices for energy storage and stretchable electronics. However films with thickness in the scale of hundreds of nanometres have the intrinsic limitation that must be deposited onto a solid and consistent substrate, thus leading to bulky devices. Moreover pristine PEDOT:PSS exhibits thus several treatments, such as drop casting or acid vapours exposure, are usually pursued to increase it. These methods however are not easily implementable in production lines. Here we show a free-standing conductive dark-PEDOT (d-PEDOT), obtained by a low cost and fast in-solution treatment by sulphuric acid. The proposed synthesis procedure is based on methods industrially implementable. The obtained paste is mouldable and allows for the fabrication of free-standing tens of μm thick foils, made as easily as scribing by an ink pen. Electrical characterization shows a conductivity of 500 Scm-1, which makes the new material a good alternative to standard and expensive metal contacts.
关键词： free-standing,electrodes,PEDOT:PSS,solar cells
更新于2025-09-04 15:30:14
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Towards Free Standing Lonsdaleite and Diamond Few Layers: The Nitrogen Effect
摘要： Strong, directional, N bonding led surface stabilization is induced to obtain free standing two dimensional layered assemblies of Lonsdaleite and diamond phase carbon by surface termination at 3 coordinated C sites. These assemblies have strong bonding and surface N lone pair induced self protection and achieves respective bulk-like electronic, mechanical and crystallographic properties at as low as 7 atomic layer thickness. Lonsdaleite phase sub-nano thickness free standing as small as 3 layered assembly shows bulk-like thermal stability up to 2900K. Size con?nement e?ect dominates up to four layered assembly and then electronic and crystallographic properties are dominated by bulk stabilization which saturates towards respective bulk-like features from 7 layer assembly. Similarly, free standing hybrid assemblies of Lonsdaleite phase carbon with BeF (C5NBeF) and BS (C5NBS) layer are also proposed along with low symmetric Cm-C3N4 layered assembly. The combination of N and O is shown to stabilize surface of nanodiamond but shows signi?cant variation in structural and electronic properties, which are principally govern by con?nement e?ect because of weak surface stabilization. Our results proposes that, in principle, two dimensional free standing layered assemblies of the sp3 hybridized phases of carbon with surface terminated by only 3 coordinated C sites, can be stabilized and engineered by substitutional doping of N, and in some cases respective bulk-like electronic and crystallographic properties at nano size can be achieved.
关键词： diamond,nitrogen effect,Lonsdaleite,surface stabilization,free standing layered assemblies,bulk-like properties
更新于2025-09-04 15:30:14