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- 摘要
- 关键词
- 实验方案
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - High Sensitivity Inkjet-Printed Terahertz Metallic Hole Array Sensor
摘要： Surface plasmon resonance sensors based on the resonant transmission characteristics of metal hole arrays are fabricated using conductive inkjet printing for operation in the terahertz region. The response of the sensing surfaces is measured using terahertz time domain spectroscopy. The addition of a layer of glycerol on the surface that is much thinner than the wavelength of the incident wave is simulated and results in a significant shift of the resonance frequency. This indicates the possibility of realising a flexible low-cost sensor for chemical and biological substances.
关键词： metamaterial,surface plasmon polariton,inkjet,sensor,Conductive ink printing
更新于2025-09-04 15:30:14
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Additive Manufacturing of Transparent Glass Structures
摘要： Advancements in manufacturing during the Industrial Revolution enabled the widespread use of glass in buildings and household objects. Nonetheless, processes for the fabrication of complex geometry and custom objects with glass remain elusive. We present G3DP2—a second iteration of the novel additive manufacturing (AM) technology for transparent glass products developed by The Mediated Matter Group at MIT. One of the oldest production materials, glass involves complex material chemistry and requires extreme working temperatures underlying the persistent challenges associated with its design and production. AM with molten glass presents a potential path toward production of highly complex geometry and custom-designed objects while retaining the optical transparency and chemical stability available through traditional manufacturing processes. G3DP2 is a new AM platform for molten glass that combines digitally integrated three-zone thermal control system with four-axis motion control system, introducing industrial-scale production capabilities with enhanced production rate and reliability while ensuring product accuracy and repeatability, all previously unattainable for glass. A series of material characterizations were conducted to evaluate the mechanical properties of the 3D-printed glass products produced by G3DP2. A set of 3-m-tall glass columns was designed, engineered, and digitally fabricated for Milan Design Week 2017, highlighting the geometric complexity, accuracy, strength, and transparency of 3D-printed glass at an architectural scale for the ?rst time and a critical step in utilizing the true structural capacity of the material. Together, the installation and the G3DP2 platform serve as a foundation for future work and suggest exciting possibilities associated with the digital fabrication of glass as well as potential applications in product and architectural design.
关键词： 3D printing,additive manufacturing,printed glass,glass structures,glass,transparent
更新于2025-09-04 15:30:14
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Self-Aligned Metal Electrodes in Fully Roll-to-Roll Processed Organic Transistors
摘要： We demonstrate the production of organic bottom gate transistors with self-aligned electrodes, using only continuous roll-to-roll (R2R) techniques. The self-alignment allows accurate <5 μm layer-to-layer registration, which is usually a challenge in high-speed R2R environments as the standard registration methods are limited to the millimeter range—or, at best, to tens of μm if online cameras and automatic web control are utilized. The improved registration enables minimizing the overlap between the source/drain electrodes and the gate electrode, which is essential for minimizing the parasitic capacitance. The complete process is a combination of several techniques, including evaporation, reverse gravure, ?exography, lift-off, UV exposure and development methods—all transferred to a continuous R2R pilot line. Altogether, approximately 80 meters of devices consisting of thousands of transistors were manufactured in a roll-to-roll fashion. Finally, a cost analysis is presented in order to ascertain the main costs and to predict whether the process would be feasible for the industrial production of organic transistors.
关键词： roll-to-roll,cost analysis,self-alignment,printing,organic transistor
更新于2025-09-04 15:30:14
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P-14.1: Highly Polarized Aligned Quantum Rods Fluorescent Film Based on Contact Ink-Jet Printing Method
摘要： In recent years, fluorescent quantum rods (QRs) receive much attention because of their properties of emitting specific wavelength polarized light with narrow full width at half maximum (FWHM). Therefore, QRs are usually aligned on devices, such as light emitting diodes, laser, and liquid crystal display (LCD), as a polarizer. In order to emit the light with a high degree of polarization (DOP), QRs need to be controlled and aligned almost along one direction on large-scaled devices. However, most of the proposed effective alignment approaches cannot be applied to a large area. Hence, we firstly propose the contact ink-jet printing (CIJP) method to align CdSe/CdS core/shell QRs. With the ink being printed, the QRs can move driven by ink flowing. Eventually, the QRs will be aligned along the printed trajectories and become a film with DOP of more than 40%. Furthermore, CIJP can realize arbitrarily large area fabrication without reducing DOP value. In the future, this method can be utilized to print on large-scaled substrates directly to fabricate polarized optoelectronic devices, and further applied to LCD backlights and optical lenses.
关键词： contact ink-jet printing,quantum rods,degree of polarization
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Silver Metallization of 77 GHz 3D Printed Horn Antennas
摘要： This paper starts with the description of a new direct chemical plating method for silver, called the JET METAL (JMT) process. This technology is based on spraying separately an aqueous solution containing silver metallic ions together with a REACH compliant, aqueous based reducing agent. This process allows to deposit chemical silver up to twenty two micron / hour at room temperature and at ambient pressure and is already used in industrial processes for metallizing plastics, composites and non-conductive materials in general and this in different formats (3 dimensions, pieces, foils, ...). In the second part, results obtained with 3D printed horn antenna, metallized with the above described process are compared with standard Cu horn antennas and 3D printed electroplated horn antennas at mm-wave frequencies.
关键词： antenna manufacturing,horn antenna,3D printing,Silver,Metallization
更新于2025-09-04 15:30:14
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3D Printing and Ophthalmology for the Community
摘要： People may have heard of three dimensional (3D) printed firearms, which carries bad publicity for 3D printing, yet amazing things have been achieved with simple desktop 3D printers within the medical field. 3D printing was almost unheard of until the last 5 years; as key additive-manufacturing patents expire, affordable desktop 3D printers mushroomed globally. The technology of 3D printing is not new. Actually, the idea can be traced back to as early as the 1890s when Blanther suggested a layered method for making a mould for topographical relief maps. However, it was not until 1987 when the first additive manufacturing machine emerged. In simpler terms, 3D printing is in fact 2D printing but over and over again, layered together. As patents expire, innovation took over the stage and people started building affordable, user-friendly 3D printers that are now widely available. Fused deposition modelling (FDM) printers are the most common consumer oriented printers and brands such as MakerBot and Ultimaker currently dominate the consumer market. These are low end 3D printers that have made the biggest impacts and allowed innovative leaps in the medical field. Recently, an interventional radiologist managed to save a patient’s spleen with 3D printing technology. The patient was diagnosed with a number of complicated tortuous splenic aneurysms and conventionally, she would have been treated with splenectomy. However, the interventional radiologist managed to spare her spleen by coiling the aneurysms instead. The success was not by luck or co-incidence; it was through countless practices on a 3D printed replica of the patient’s splenic aneurysms. 3D printing in ophthalmology is an exciting field. There are a variety of uses ranging from optics industry printing spectacles to scientist printing ocular tissues such as sclera and cornea. 3D printing has the advantage of low-cost yet high-level customization, making it cost-effective for making one of a kind devices or prostheses. Combined with 3D scanning technology, a patient could have his or her customized prosthetic eye 3D printed in a matter of days instead of weeks.
关键词： Smartphone retinal camera,Smartphone slit lamp microscope,3D printing in ophthalmology,Smartphone in teleophthalmology
更新于2025-09-04 15:30:14
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CHARACTERISATION OF COPPER NANOPARTICLE INK PRINTED FSS FOR CELLULAR SIGNALS SUPPRESSION
摘要： This paper proposes a copper nanoparticle ink printed frequency selective surface (FSS) for cellular signals suppression. The FSS pattern is deposited on a polyimide film by using an inkjet printing technique. The printed FSS elements undergo the post-processing called sintering, where the optimum exposure duration and temperature are determined in order to form a conductive path across the metal pattern. Later, the conductivity of the printed FSS structure deposited on polyimide film is observed. The signal suppression ability of the printed FSS is conducted using the Computer Simulation Technology (CST) Microwave Studio software.
关键词： cellular signals suppression,inkjet printing,copper nanoparticle ink,frequency selective surface,sintering
更新于2025-09-04 15:30:14
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Printing Birefringent Figures by Surface Tension-Directed Self-Assembly of a Cellulose Nanocrystal/Polymer Ink Components
摘要： Photonic printing on transparent substrates using emerging synthetic photonic crystals is in high demand, especially for anti-fraud applications. However, photonic printing is faced with grand challenges including lack of the full invisibility of printed patterns before stimulation or after stimuli removal and absence of the long-lasting stability. Natural anisotropic crystal structures and artificially molecularly arranged polymers show an optically anisotropic property known as birefringence. Crystalline cellulose is the most abundant birefringent bio-crystal on the earth. Here, we introduce a printing method based on using a cellulose nanocrystal/polymer ink that is governed by surface evaporation phenomenon and divided surface tension forces to direct the self-assembly of ink components at the nanoscale and print 3D birefringent micro-figures on transparent substrates. This type of printing is from now on referred to as Birefringent Printing (BP). Unlike previously reported photonic crystal printing methods, this method is accurate, has high-contrast, is virtually impossible to forge and at the same time is very simple, inexpensive and non-toxic.
关键词： polymer ink,cellulose nanocrystal,directed self-assembly,birefringence,surface tension,invisible printing
更新于2025-09-04 15:30:14
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3D stretchable and transparent conductors with controllable strain-distribution based on template-assisted transfer printing
摘要： Although stretchable transparent conductors, stemmed from the strategies of both conductive composite and structural design of non-stretchable conductors, have been extensively studied, these conductors either suffer from a low stretchability or require a complex fabrication process, which drastically limits their practical applications. Here, we propose a novel strategy combining the design of substrates and a simple template-assisted transfer printing process to fabricate 3D transparent conductors. The strategy not only eliminates the complex and costly fabrication processes, but it also endows conductors with high stretchability and long-term stability thanks to the controllable strain-distribution as well as the seamless connection between the conductor layer and the substrate. These newly-designed 3D conductors achieve a low sheet resistance of 1.0 Ω/sq with a high transmittance of above 85% and remain stable without obvious resistance change during 1000 stretching-relaxation cycles until 60% strain, which are superior to most reported conductors. A large-area stretchable heater based on the 3D conductor realizes the temperature fluctuation below 10% even under a large strain, thus showing huge application prospects in the field of wearable healthcare electronics. The simple solution-processed fabrication method and high performance such as stretchability and low resistance change over large strain range promote the practical applications of these newly-designed 3D conductors.
关键词： 3D substrates,template-assisted transfer printing,solution-processed,wearable electronics,stretchable transparent conductors
更新于2025-09-04 15:30:14
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Dual-Channel Photoelectrochemical Ratiometric Aptasensor with Up-converting Nanocrystals Using Spatial-Resolved Technique on Homemade 3D Printed Device
摘要： A near-infrared light (NIRL)-activated ratiometric photoelectrochemical (PEC) aptasensor was fabricated for detection of carcinoembryonic antigen (CEA) coupling with upconversion nanoparticles (UCNPs)-semiconductor nanocrystals-based spatial-resolved technique on a homemade 3D printing device in which a self-regulating integrated electrode was designed for dual signal readout. The as-prepared NaYF4:Yb, Er UCNPs@CdTe nanocrystals were initially assembled on two adjacent photoelectrodes, then CEA aptamer 1 (A1) and capture DNA (CA) were modified onto two working photoelectrodes (WP1 and WP2) through covalent binding, respectively, and then gold nanoparticle-labeled CEA aptamer 2 (Au NP-A2) were immobilized on the surface of functional WP2 for the formation of double-stranded DNA. Upon target CEA introduction, the various concentrations of CEA were captured on the WP1, whereas the binding of the CEA with Au NP-A2 could be released from the WP2 thanks to the highly affinity of CEA toward A2. The dual signal readout with the 'signal-off' of WP1 and 'signal-on' of WP2 were employed for the spatial-resolved PEC (SR-PEC) strategy to detect CEA as an analytical model. Combining NaYF4:Yb, Er UCNPs@CdTe nanocrystals with spatial-resolved model on 3D printing device, the PEC ratiometric aptasensor based on steric hindrance effect and exciton-plasmon interactions (EPI) exhibited a linear range from 10.0 pg mL-1 to 5.0 ng mL-1 with a limit of detection of 4.8 pg mL-1 under 980 nm illumination. The SR-PEC ratiometric strategy showed acceptable stability and reproducibility with a superior anti-interference ability. This approach can provide the guidance for the design of ratiometric, multiplexed and point-of-care biosensors.
关键词： 3D printing device,upconversion nanoparticles,Photoelectrochemical biosensor,ratiometric,spatial-resolved technique,carcinoembryonic antigen
更新于2025-09-04 15:30:14