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Yuanying Liang, Mathis Ernst, Fabian Brings, Dmitry Kireev, Vanessa Maybeck, Andreas Offenhäusser, Dirk Mayer
Flexible and transparent electronic devices possess crucial advantages over conventional silicon based systems for bioelectronic applications since they are able to adapt to nonplanar surfaces, cause less chronic immunoreactivity, and facilitate easy optical inspection. Here, organic electrochemical transistors (OECTs) are embedded in a flexible matrix of polyimide to record cardiac action potentials. The wafer-scale fabricated devices exhibit transconductances (12 mS V-1 ) and drain-source on-to-off current ratios (≈105 ) comparable to state of the art nonflexible and superior to other reported flexible OECTs...
August 14, 2018: Advanced Healthcare Materials
Chenying Wang, Hongjia Zhang, Chunlei Li, Yun He, Le Zhang, Xinger Zhao, Qu Yang, Dan Xian, Qi Mao, Bin Peng, Ziyao Zhou, Wanzhao Cui, Zhongqiang Hu
In spite of recent rapid development of flexible electronics, voltage tunable spintronic structures and devices on flexible substrates have been rarely studied. Here, voltage control of magnetic anisotropy (VCMA) is demonstrated via ionic gel (IG) gating on flexible polyimide substrates with a circuit operating voltage of 1.8 V. A reversible, non-volatile VCMA switching of 114 Oe is achieved in Pt/Fe/Pt multilayer, where the spatial magnetic anisotropy distribution is determined quantitatively by electron spin resonance (ESR) technique...
August 10, 2018: ACS Applied Materials & Interfaces
Yanan Wang, Yong Wang, Peipei Zhang, Fu Liu, Sida Luo
The recently emergent laser-induced graphene (LIG) technology has endowed the fabrication of smart devices with one-step processing and scalable/designable features. Graphene paper (GP), an important architecture of 2D layered carbon, however, is never produced through LIG. Herein, a novel strategy is reported for production of freestanding GP through LIG technology. It is first determined that the unique spatial configuration of polyimide (PI) paper is critical for the preparation of GP without the appearance of intense shape distortion...
August 7, 2018: Small
Wenjing Ma, Juntao Zhao, Olayinka Oderinde, Jingquan Han, Zhongche Liu, Buhong Gao, Ranhua Xiong, Qilu Zhang, Shaohua Jiang, Chaobo Huang
Marinepollution andindustrial wastewater have caused serious environmental pollution, thereby resulting into an alarming damage to public health in the past decades, hence the high demand for, cost effective, energy-efficient oil-water separation technologies for the removal of oil contaminants from such water. Herein, we report a facile method to fabricate superhydrophobic/superoleophilic membrane by immersing a polyimide (PI)-based nanofibrous membrane into a water/ethanol/ammonia/dopamine mixture, followed by modification with 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT)...
June 25, 2018: Journal of Colloid and Interface Science
David L Gonzalez Arellano, Kristopher W Kolewe, Victor K Champagne, Irene S Kurtz, Edmund K Burnett, Julia A Zakashansky, Feyza Dundar Arisoy, Alejandro L Briseno, Jessica D Schiffman
The biocidal properties of gecko skin and cicada wings have inspired the synthesis of synthetic surfaces decorated with high aspect ratio nanostructures that inactivate microorganisms. Here, we investigate the bactericidal activity of oriented zinc phthalocyanine (ZnPc) nanopillars grown using a simple pencil-drawn graphite templating technique. By varying the evaporation time, nanopillars initiated from graphite that was scribbled using a pencil onto silicon substrates were optimized to yield a high inactivation of the Gram-negative bacteria, Escherichia coli...
August 2, 2018: Scientific Reports
Gil Bashan, Hilel Hagai Diamandi, Yosef London, Eyal Preter, Avi Zadok
Optical fibres constitute an exceptional sensing platform. However, standard fibres present an inherent sensing challenge: they confine light to an inner core. Consequently, distributed fibre sensors are restricted to the measurement of conditions that prevail within the core. This work presents distributed analysis of media outside unmodified, standard fibre. Measurements are based on stimulated scattering by guided acoustic modes, which allow us to listen where we cannot look. The protocol overcomes a major difficulty: guided acoustic waves induce forward scattering, which cannot be mapped using time-of-flight...
July 31, 2018: Nature Communications
Qing Li, Jing Li, Guangfu Liao, Zushun Xu
1,3,5-Tris(4-aminophenoxy) benzene (TAPOB) and 2,2-bis [4-(3,4-dicarboxyphenoxy) phenyl] propane dianhydride (BPADA) were used to synthesize an amino-terminated hyperbranched polyimide (AM-HBPI). Then, the 2-methacryloyloxyethyl phosphorylcholine-modified hyperbranched polyimide (HBPI-MPC) was obtained through the graft modification of MPC onto AM-HBPI by Michael addition. The infrared spectroscopy and X-ray photoelectron spectroscopy spectra showed MPC molecules were successfully grafted onto the HBPI molecules...
July 28, 2018: Journal of Materials Science. Materials in Medicine
Hua-Yao Li, Chul-Soon Lee, Do Hong Kim, Jong-Heun Lee
Ammonia (NH3 ) is an irritant gas with a unique pungent odor; sub-parts per million-level breath ammonia is a medical biomarker for kidney disorders and Helicobacter pylori bacteria-induced stomach infections. The humidity varies in both ambient environment and exhaled breath, and thus humidity dependence of gas-sensing characteristics is a great obstacle for real-time applications. Herein, flexible, humidity-independent, and room-temperature ammonia sensors are fabricated by the thermal evaporation of CuBr on a polyimide substrate and subsequent coating of a nanoscale moisture-blocking CeO2 overlayer by electron-beam evaporation...
August 8, 2018: ACS Applied Materials & Interfaces
Hyungjoo Kim, Jinseok Kim, Jaheon Kang, Yong-Won Song
One of the ultimate wearable heath-monitoring gears, smart contact lens, requires miniaturized devices compounded and interconnected with each other on the lens for a successful system functioning. Because of the different device thickness, the interconnect patterns need to be three-dimensional (3D) conforming the steps given by the diversified on-lens devices. Also, the patterns should be low-temperature processed and flexible considering the mechanical and thermal property of the lens material. We demonstrate the 3D interconnects electrosprayed on a contact lens platform with Ag-Ag nanowire (NWs) composite ink conforming the steps...
August 7, 2018: ACS Applied Materials & Interfaces
Jun Yan, Biao Zhang, Zhonggang Wang
Ultramicroporous semicycloaliphatic polyimides with major pore sizes less than 0.5 nm are synthesized through imidization reaction between different aromatic tetraamines and cycloaliphatic dianhydrides. The synergistic role of abundant CO2 -philic imide rings and the molecular sieving effect of ultrasmall pores in the polyimide network bring about high adsorption selectivity of CO2 /CH4 (37.2) and CO2 /N2 (136.7). In addition, it is interesting to observe that, under ambient condition (298 K/1 bar), n-butane exhibits the highest uptake (3...
August 8, 2018: ACS Applied Materials & Interfaces
Alvaro Garcia-Cruz, Michael Lee, Nadia Zine, Monique Sigaud, Pedro Marote, Manuel Lopez, Joan Bausells, Nicole Jaffrezic-Renault, Abdelhamid Errachid
A highly performant patterning of antibodies using poly(pyrrole) nanowires (PPy-NWs) was devised on thermoplastic surfaces based on silane derivatives. The PPy-NWs were fabricated employing nanocontact printing and controlled chemical polymerization (nCP-CCP) on poly(ethylene terephthalate), cyclic olefin copolymer, poly(ethylene 2,6-naphthalate), and polyimide. The technique used a commercial compact disk as a template (mold) to produce nanopatterned polydimethylsiloxane stamps. The nanopatterned stamp was then employed to print PPy-NWs...
October 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Xi-Ming Wang, Zhi-Yong Guo, Yue Zhang, Ming-Li Chen, Jian-Hua Wang
Fex Oy and ZrO2 nanoparticles co-doped layered porous polyimide, polyimide-Fex Oy -ZrO2 is prepared with a one-step strategy, shortly termed as PI-Fex Oy -ZrO2 . The layered and porous structure of the polymer offers a supported platform for metallic oxide anchoring, exhibiting a mesopore size of 3.93 nm and providing a surface area of 198.47 m2 g-1 . The metallic oxides were uniformly and highly dispersed in the PI-Fex Oy -ZrO2 nanocomposite with percentages of 15.81 and 20.53 wt% for Fe and Zr, respectively...
October 1, 2018: Talanta
Wook Choi, Eun-Seok Jeon, Kyoung-Yong Chun, Young-Rok Kim, Kyeong-Beom Park, Ki-Bum Kim, Chang-Soo Han
We report a novel low-noise nanopore device employing a polymer substrate. The Si substrate of a fabricated Si-substrate-based silicon nitride (Si3N4) membrane was replaced with a polymer substrate. As such, laser machining was used to make a micro-size hole through the polyimide (PI) substrate, and a thin Si3N4 membrane was then transferred onto the PI substrate. Finally, a nanopore was formed in the membrane using a transmission electron microscope for detection of biomolecules. Compared to the Si-substrate-based device, the dielectric noise was greatly reduced and the root-mean-square noise level was decreased from 146...
2018: PloS One
Xiaohan Wang, Yixuan Li, Yuhai Qian, Hong Qi, Jian Li, Junqi Sun
Polymeric materials used in spacecraft require to be protected with an atomic oxygen (AO)-resistant layer because AO can degrade these polymers when spacecraft serves in low earth orbit (LEO) environment. However, mechanical damage on AO-resistant coatings can expose the underlying polymers to AO erosion, shortening their service life. In this study, the fabrication of durable AO-resistant coatings that are capable of autonomously healing mechanical damage under LEO environment is presented. The self-healing AO-resistant coatings are comprised of 2-ureido-4[1H]-pyrimidinone (UPy)-functionalized polyhedral oligomeric silsesquioxane (POSS) (denoted as UPy-POSS) that forms hydrogen-bonded three-dimensional supramolecular polymers...
July 18, 2018: Advanced Materials
Sadaf Charkhabi, Andee M Beierle, Marshall D McDaniel, Nigel F Reuel
A passive, resonant sensor was developed that can be embedded in closed systems for wireless monitoring of hydrolytic enzyme activity. The resonators are rapidly prototyped from copper coated polyimide substrates that are masked using an indelible marker with an XY plotter and subsequently etched. The resonator's frequency response window is designed by the Archimedean coil length and pitch and is tuned for the 1-100 MHz range for better penetration through soil, water, and tissue. The resonant frequency is measured up to 5 cm stand-off distance by a coplanar, two-loop coil reader antenna attached to a vector network analyzer monitoring the S21 scattering parameter...
August 2, 2018: ACS Sensors
Chao Zhang, Zhicheng Shi, Fan Mao, Chaoqiang Yang, Xiaotong Zhu, Jie Yang, Heng Zuo, Runhua Fan
Intrinsic metamaterials with negative- k that originated from random-structured materials have drawn increasing attention. Currently, intrinsic negative- k was mainly achieved in percolative composites by tailoring the compositions and microstructures. Herein, plasmalike negative- k was successfully achieved in multiwalled carbon nanotubes (MWCNT)/polyimide (PI) nanocomposites via applying external dc bias which exhibited excellent capability in conveniently and accurately adjusting negative- k. Mechanism analysis indicated that the localized charges at the interfaces between MWCNT and PI became delocalized after gaining energy from the dc bias, resulting in elevated concentration of delocalized charges, and hence the enhanced negative- k...
July 24, 2018: ACS Applied Materials & Interfaces
Francisco J Romero, Alfonso Salinas-Castillo, Almudena Rivadeneyra, Andreas Albrecht, Andres Godoy, Diego P Morales, Noel Rodriguez
This work presents a detailed study of the photothermal ablation of Kapton® polyimide by a laser diode targeting its electrical conductivity enhancement. Laser-treated samples were structurally characterized using Scanning Electron Microscopy (SEM), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), as well as Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy. The results show that the laser-assisted ablation constitutes a simple one-step and environmental friendly method to induce graphene-derived structures on the surface of polyimide films...
July 11, 2018: Nanomaterials
Baekhoon Seong, Hyungdong Lee, Jaehyun Lee, Liwei Lin, Hyung-Seok Jang, Doyoung Byun
Organic-inorganic hybrid layer-by-layer (LBL) composite structures can not only increase the strength and ductility of materials but also well disperse nanomaterials for better-conducting pathways. Here, we discovered the self-assembly process of an organic and silver (Ag) LBL hybrid structure having excellent sustainability during the long-term bending cycle. During the assembly process, the organic and Ag hybrid structure can be self-assembled into a layered structure. Unlike other conventional LBL fabrication processes, we applied the hydrogel scaffold of a biological polymer, which can spontaneously phase separate into an LBL structure in a water/alcohol solvent system...
August 1, 2018: ACS Applied Materials & Interfaces
Moonjeong Bok, Yunwoo Lee, Daehoon Park, Sangho Shin, Zhi-Jun Zhao, Boyeon Hwang, Soon Hyoung Hwang, So Hee Jeon, Joo-Yun Jung, Sung Ha Park, Junghyo Nah, Eunju Lim, Jun-Ho Jeong
In this study, a combined system of microneedles and a triboelectric nanogenerator (TENG) has been developed for drug delivery. A triboelectric device, which converts mechanical energy into alternating current (AC), was chosen to replace the electrophoresis (EP) effect. To directly generate triboelectricity from salmon deoxyribonucleic acid (SDNA)-based microneedles, a triboelectric series of SDNA film and chargeable polymers (polyimide and Teflon) was studied. The electrical output of the two charged polymers was compared to find a material that could be highly charged with SDNA...
July 19, 2018: Nanoscale
Jutamart Chotipanich, Suraya Hanim Abu Bakar, Amornchai Arponwichanop, Tetsu Yonezawa, Soorathep Kheawhom
A simple and low-cost method to fabricate copper conductive patterns at low temperature is critical for printed electronics. Low-temperature spray-pyrolysis of copper-alkanolamine complex solution shows high potential for this application. However, the produced copper patterns exhibit a granular structure consisting of connected fine copper particles. In this work, low-temperature spray-pyrolysis of copper formate-diethanolamine complex solution under N2 flow at a temperature of 200 °C was investigated. The effects of spraying conditions on microstructure and electrical properties of the patterns were examined...
2018: PloS One
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