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Design and realization of multilayered cylindrical dielectric lens antenna using 3D printing technology
摘要： Herein, design and realization of a novel, low cost, small size, high gain, 3D printed multilayered cylindrical dielectric lens antenna (MLCDLA) is presented at 10 GHz. In the first stage, MLCDLA is designed suitable the 3D printed technology in CST 3D EM simulation environment. Then gain, return loss, and radiation pattern of the design are investigated in the X-band frequencies in the same 3D simulated environment. In the second stage, the designed lens is fabricated by the 3D printed technology in dimensions of 30 × 30 × 52.5 mm3 using acrylonitrile butadiene styrene, with εr = 2.5. In the final stage, performance characteristics of the proposed LCDLA are measured using 10 GHz rectangular waveguide as feeding unit and are compared with the simulated results and counterpart designs in literature. The prototyped MLCDLA is achieved 14 dBi measured gain at 10 GHz. It can be concluded that the proposed 3D printing method not only enables a high performance MLCDLA design but also provides its fast, low cost, and effective prototyping process which can be used for other microwave devices.
关键词： waveguide,novel prototyping methods,dielectric lenses,3D printing
更新于2025-09-19 17:15:36
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All-printed, low-cost, tunable sensing range strain sensors based on Ag nanodendrite conductive inks for wearable electronics
摘要： Flexible and wearable strain sensors with high stretchability and high sensitivity have been studied intensively. However, the achievement of low-cost, rapid mass production and high performance of wearable strain sensors remains a challenge. In this study, Ag nanodendrite (ND) inks with good printability for varieties of substrates are prepared, which can be directly screen-printed onto nitrile rubber to manufacture strain sensors. Printed strain sensors (PSSs) with diverse working strain ranges and sensitivities can be simultaneously obtained by printing versatile geometric patterns. Comparatively, straight-line PSSs with a linewidth of 2 mm exhibit high electrical conductivity (1.14 × 10^5 S m^-1), a large sensing range (105%), high sensitivity (maximum gauge factor = 294.3), an ultra-fast response time (18 ms), and long-term stability (more than three weeks). Additionally, the sensing mechanism of the PSSs is further investigated by observing their surface topographies. Eventually, a smart glove based on PSSs is used for monitoring human motion (finger bending, wrist bending, walking, etc.) and gesture actions, demonstrating the potential applications of Ag ND-based PSSs in wearable electronic devices and human–machine interaction intelligent systems.
关键词： strain sensor,tunable sensing range,wearable electronics,screen printing,Ag nanodendrite
更新于2025-09-19 17:15:36
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Comparison of spin-on-glass and WO <sub/>3</sub> as an insulating layer for printed resistive memory devices
摘要： Resistive Random Access Memory (ReRAM) is a highly promising technology for various future memory applications. In this work, spin-on-glass (SOG) and WO3 nanoparticles are used as an insulating layer for completely inkjet-printed ReRAM cells. The direct comparison shows that the di?erence in switching parameters can be used to serve di?erent device requirements for various applications. While local ?lament formation with conductive atomic force microscopy con?rms the same switching mechanism for both compounds, the current–voltage characteristics di?er from each other. SOG as excellent insulator shows an OFF resistance in the range of GΩ and is therefore highly suitable for multi-bit data storage to increase memory density. ReRAM cells with WO3 face larger leakage currents and show a low degree of multi-bit data storage. However, WO3 can be used to fabricate completely sinter-free memory devices for applications which do not allow high temperatures in the fabrication process.
关键词： spin-on-glass,?exible electronics,printed electronics,organic electronics,inkjet printing,ReRAM
更新于2025-09-19 17:15:36
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Rapid Quantitative Fluorescence Detection of Copper Ions with Disposable Microcapsule Arrays Utilizing Functional Nucleic Acid Strategy
摘要： In this work, an economical and easy-to-use microcapsule array fabricated by ice printing technique has been realized for ultrasensitive fluorescence quantification of copper ions employing functional nucleic acid strategy. With ice printing, the detection reagents are sealed by polystyrene (PS) film isolation and photopolymer, which guarantees a stable and contamination-free environment for functional nucleic acid reaction. Our microcapsule arrays have shown long-term stability (20 days) under ?20 °C storage in frozen form before use. During the Cu2+ on-site detection, 1 μL sample is simply injected into the thawy microcapsule by a microliter syringe under room temperature, and after 20 minutes the fluorescence result can be obtained by an LED transilluminator. This method can realize the detection limit to 100 nM (100 fmol/μL) with high specificity.
关键词： ice printing,functional nucleic acid,fluorescence detection,copper ions,microcapsule arrays
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - Contact-Printing of Zinc Oxide Nanowires for Chemical Sensing Applications
摘要： This paper presents a new method for printing zinc oxide (ZnO) nanowires (NWs) and their analysis for chemical sensing applications. High-crystal quality ZnO NWs are synthesized by chemical vapour transport (CVT) technique and directly transferred and aligned on a glass substrate by using contact-printing technique. With an accurate control of the contact-printing parameters such as load and speed over the entire printing process, a highly uniform, dense and well-aligned NWs layers are obtained on the desired substrate over large areas. The validity of the ZnO NWs as chemical sensing material is demonstrated by carrying out both cyclic voltammetry and electrochemical impedance spectroscopic measurements in different pH solutions. Results demonstrate a high stability of ZnO NWs to basic solutions (i.e. pH > 6), which shows their suitability for applications such as sweat or water quality monitoring sensors.
关键词： pH Sensors,Contact-printing,Chemical Sensors,Nanowire Assembly,ZnO Nanowires
更新于2025-09-19 17:15:36
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Mechanically robust nanocomposites from screen-printable polymer/graphene nanosheet pastes
摘要： Innovative methods producing graphene-based polymer nanocomposites with excellent mechanical robustness have become a focus on practical utilization, but existing solutions suffer from drawbacks such as laboratory-scale, unaffordability, and inadequate processability. To address those issues, we proposed screen printing approach utilizing formulated graphene-modified water-based printable pastes to achieve inexpensive and scalable manufacturing of graphene-reinforced polymer nanocomposites. Leveraging this simple and versatile manufacturing process, not only mass production but also individualized-pattern bulk materials can be efficiently produced using easily obtainable substrates. The surface-tailored graphene (PEI-rGO) can improve the dispersion quality and strengthen the interfacial bonding with waterborne polyurethane (WPU) matrix, yielding optimized enhancement effect and then enhancing the tensile strength and Young’s modulus about 9.46 and 19.8 times relative to that of the pure WPU, respectively. In particularly, their utility as anti-wear modifier through direct printing on textile and wear-reduction performance were investigated. Beyond such, our study establishes screen printing as a general strategy to achieve facile fabrication of polymer nanocomposites in an industrial-scale and economically viable manner, which can to a great extent bridge the gap between scientific research and real-world applications.
关键词： screen printing,waterborne polyurethane,enhancement effect,graphene,polymer matrix nanocomposites
更新于2025-09-19 17:15:36
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[IEEE 2018 International Flexible Electronics Technology Conference (IFETC) - Ottawa, ON (2018.8.7-2018.8.9)] 2018 International Flexible Electronics Technology Conference (IFETC) - 3D Printed Ion-Selective Field Effect Transistors
摘要： This report describes 3D printed ion-selective field effect transistors (IS-FET), which contains electro-chemical working electrodes for selective ion detection. For the comparison of behaviors, two different types of field effect transistors are fabricated by 3D printing and vacuum deposition. And both types of FETs are integrated with the 3D printed ion-selective electrodes. Then, the sensing performance of these two types of IS-FET has been investigated. The source-drain current for the whole 3D printed IS-FET is in the scale of 10-8 A, which can be compared with current scale of deposited IS-FET with 10-6 A.
关键词： ion-selective field effect transistors,3D printing,oxide FET
更新于2025-09-19 17:15:36
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Sol–Gel-Processed Organic–Inorganic Hybrid for Flexible Conductive Substrates Based on Gravure-Printed Silver Nanowires and Graphene
摘要： In this study, an organic–inorganic (O–I) nanohybrid obtained by incorporating an alkoxysilane-functionalized amphiphilic polymer precursor into a SiO2–TiO2 hybrid network was successfully utilized as a buffer layer to fabricate a flexible, transparent, and stable conductive substrate for solution-processed silver nanowires (AgNWs) and graphene under ambient conditions. The resulting O–I nanohybrid sol (denoted as AGPTi) provided a transmittance of the spin-coated AgNWs on an AGPTi-coated glass of 99.4% and high adhesion strength after a 3M tape test, with no visible changes in the AgNWs. In addition, AGPTi acted as a highly functional buffer layer, absorbing the applied pressure between the conductive materials, AgNWs and graphene, and rigid substrate, leading to a significant reduction in sheet resistance. Furthermore, gravure-printed AgNWs and graphene on the AGPTi-based flexible substrate had uniform line widths of 490 ± 15 and 470 ± 12 μm, with 1000-cycle bending durabilities, respectively.
关键词： gravure printing,flexible electronics,nanomaterials,conductive substrate
更新于2025-09-19 17:15:36
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Dielectric replica measurement: A new technique for obtaining the complex permittivity of irregularly shaped objects
摘要： Dielectric measurements provide valuable information about the properties of materials, and could be used to classify and identify the source of objects, in fields such as archaeology. Current methods of identification are all partly destructive, so an innovative electromagnetic method developed by the authors, based on resonant cavity perturbation (RCP), provides an attractive, non-destructive alternative. A problem with traditional RCP is that the changes in frequency and Q-factor vary with the object's shape; however we overcome this by creating a replica of the object, from a material whose dielectric properties are known. Then, by combining three separate perturbations with orthogonal field directions, due firstly to the object and then to its replica, we eliminate the shape dependency, and thus determine the object's dielectric constant and loss factor. After developing the theory of this novel DRM technique, we demonstrate the principle using a set of geometric shapes made in both polytetrafluoroethylene (PTFE) and a 3D printed material. Further measurements then enable second-order terms to be included in the model, improving its accuracy. Finally, DRM is shown to be capable of distinguishing two irregularly shaped objects of different materials. Potential applications of DRM include determining the provenance of pottery, glasses and flints, and distinguishing ivory from bone. These would be of interest to customs and environmental agencies, as well as museum curators and archaeologists.
关键词： resonant cavity,3D printing,artefact,network analyser,Dielectric measurement,archaeology,complex permittivity,non-destructive testing
更新于2025-09-19 17:15:36
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3D Printed Floating Photocatalysts for Wastewater Treatment
摘要： Organic contaminants, specifically contaminants of emerging concern (CECs), have a great environmental impact, since the removal of these pollutants is of great difficulty by conventional treatments and the presence of these pollutants in the aquatic medium, even at low concentrations, is extremely hazardous to human health. Advanced oxidation processes and, specifically, TiO2-photocatalytic process is considered an option with positive results for an efficient treatment. However, the photocatalyst must be accessible to the UV radiation, for the activation of the TiO2. For this reason, it is recommendable to use a floating photocatalyst (with lower density than water) if the UV light comes from the solar radiation, because it will be on the water surface. In addition, this characteristic of the catalyst can entail an increase of the process efficiency if the pollutant is mainly located on the surface of water. In this context, the goal of this work is the preparation of floating photocatalysts for the removal of CECs from wastewater. TiO2 is deposited in low-density-polyethylene (LDPE), support with lower density than water and high stability and resistance to degradation. LDPE-TiO2 mixtures were prepared by different methods: mixing TiO2 and LDPE in a hot-cylinder-mixer or using o-xylene or an anionic surfactant as dispersing agent, in order to increase the dispersion of TiO2 before extrusion. Filaments obtained were printed as meshes in a Fused-Deposition-Modelling 3D-printer. The printed photocatalysts improved the activity in comparison with the plate obtained in the cylinder, used as benchmark. Thus, this study opens the doors to the in-situ treatment of CECs, using floating photocatalysts and solar radiation as the sole reagent, a very economical, efficient, easily implantable and environmentally compatible process.
关键词： photocatalysis,polyethylene mesh,wastewater treatment,3D printing.,Fused Deposition Modelling
更新于2025-09-19 17:15:36