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Interconversion Between Bipolar and Complementary Behavior in Nanoscale Resistive Switching Devices
摘要： In the study of resistive random access memory using GeTeOx film as the switching layer, the device performed excellent property of bipolar resistive switching (BRS), which could be gradually transformed to the complementary resistive switching (CRS) by varying SET process current compliance. The conductive filament conduction mechanism of BRS could be verified by electrical characteristics and reliable data fitting. Through increasing current compliance of the SET process, CRS could be achieved due to higher activity of oxygen vacancies originated from the intensified thermal effect. This paper was beneficial to understand the switching mechanisms of BRS and CRS and provide a method to realize interconversion. Moreover, it was also a potential and promising device to be applied in the neurosynaptic biomimetic field.
关键词： interconversion,complementary resistive switching (CRS),conductive filament,GeTeOx,Bipolar resistive switching (BRS)
更新于2025-09-09 09:28:46
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Simultaneous reduction and surface functionalization of graphene oxide for highly conductive and water dispersible graphene derivatives
摘要： A simple and effective preparation method for the simultaneous reduction and functionalization of graphene oxide (rGO) by 2,4-diamino benzene sulfonic acid has been developed. The derivatives exhibit excellent conductivity and high dispersibility in various solvents. The successful preparation of rGO and the presence of the sulfonated aromatic diamine on rGO surface has been confirmed by infrared and X-ray photoelectron spectroscopy, while, the analysis by micro-Raman spectroscopy indicated that the reduction/functionalization alters the lattice structure of GO by the increment the defect density when the 2,4-diamino benzene sulfonic acid is used. Moreover, the study of the dried products by X-ray diffraction spectroscopy suggested the turbostratic restacking of the exfoliated rGO into graphite-like nanostructures. The obtained derivative of simultaneous reduction and functionalization of GO was used for the preparation of highly conductive water-based gravure ink, which in turn, was successfully applied in printing on various flexible substrates, demonstrating its great potentiality in graphene-based flexible and printed electronics applications.
关键词： Conductive inks,Printed electronics,Surface functionalization,Gravure,Reduced graphene oxide
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA, USA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - Dual-Mode Silicon Photonic Crystal Nanocavity Modulator with Indium Oxide Gate
摘要： We report an ultra-efficient indium oxide gated silicon photonic crystal nanocavity electro-optical modulator, which is based on a dual-mode operation of resonance tuning and electro-absorption. With only 0.35μm long electrode, we achieved a tuning efficiency of 250pm/V and a modulation strength of 4dB/V with 35% from electro-absorption.
关键词： silicon photonics,modulator,photonic crystal cavity,transparent conductive oxide
更新于2025-09-09 09:28:46
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Electrical Conductivity Modulation of Crosslinked Composite Nanofibers Based on PEO and PEDOT:PSS
摘要： The aim of this work is to investigate the development of nano?ber mats, based on intrinsically conductive polymers (ICPs), which show simultaneously a high electrical conductivity and mandatory insoluble water properties. In particular, the nano?bers, thanks to their properties such as high surface area, porosity, and their ability to o?er a preferential pathway for electron ?ow, play a crucial role to improve the essential characteristics ensured by ICPs. The nano?ber mats are obtained by electrospinning process, starting from a polymeric solution made of polyethylene oxide (PEO) and poly(styrene sulfonate) (PEDOT:PSS). PEO is selected not only as a dopant to increase the electrical/ionic conductivity, as deeply reported in the literature, but also to ensure the proper stability of the polymeric jet, to collect a dried nano?ber mat. Moreover, in the present work, two di?erent treatments are proposed in order to induce crosslinking between PEO chains and PEDOT:PSS, made insoluble into water which is the ?nal sample. The ?rst process is based on a heating treatment, conducted at 130°C under nitrogen atmosphere for 6 h, named the annealing treatment. The second treatment is provided by UV irradiation that is e?ective to induce a ?nal crosslinking, when a photoinitiator, such as benzophenone, is added. Furthermore, we demonstrate that both crosslinking treatments can be used to verify the preservation of nanostructures and their good electrical conductivity after water treatment (i.e., water resistance). In particular, we con?rm that the crosslinking method with UV irradiation results to being more e?ective than the standard annealing treatment. Indeed, we demonstrate that the processing time, required to obtain the ?nal crosslinked nano?ber mats with a high electrical conductance, results to being smaller than the one needed during the heating treatment.
关键词： PEO,PEDOT:PSS,intrinsically conductive polymers,electrical conductivity,nano?ber mats,water resistance,electrospinning,crosslinking
更新于2025-09-09 09:28:46
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AZO (ZnO:Al) Transparent Conductive Film Prepared by Plasma Enhanced Chemical Vapour Deposition and its Performances in Comparison with ZnO Film
摘要： In this paper, AZO(ZnO:Al) polycrystalline thin films have been fabricated by PECVD (plasma enhanced chemical vapour deposition) method. Based on PECVD method, the fabrication process of AZO film is shown in detail. Furthermore, the measurements of the film electro-optical properties have been bringing forth, in comparison with ZnO film. The results suggested that based on PECVD method, AZO films with strong adhesion to the substrate, as low as 89 ?/% of square resistance and as high as 85 % of visible light transmittance have been deposited on the glass substrate and the silicon substrate, respectively.
关键词： Transparent conductive film,Plasma enhanced chemical vapour deposition,AZO (ZnO:Al)
更新于2025-09-09 09:28:46
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Intrinsically recyclable and self-healable conductive supramolecular polymers for customizable electronic sensors
摘要： Electronic waste is increasing rapidly and ruining ecosphere owing to the growing amount of unrecyclable and even toxic electronic materials. Sensing components and electronic boards, mainly composed of unrecyclable metal oxides and thermoset polymers, are two major sources of electronic waste. Hence, developing novel electronic materials that can be fully recycled and reused is one of the most investigated concerns for recyclable electronics. In this study, efforts are devoted to inventing an intrinsically recyclable conductive supramolecular polymer, which is composed of a sensing segment of ionic liquid crosslinked by dynamic quadruple hydrogen bonds. This supramolecular polymer exhibits remarkable thermal sensing ability, reprocessability, and recyclability. Based on these advantages, it can be easily molded into an electronic thermometer with controllable size and shape, which can be fully recycled; also, it retains the same thermal sensing performance. Particularly, this supramolecular polymer can be processed into thermal sensing earplugs with customized 3D shapes for ear-temperature measurement as a reliable monitoring approach of body temperature. Thus, it offers great potential for practical applications in special conditions.
关键词： conductive supramolecular polymer,recyclable electronics,self-healing,customizable electronic sensors,thermal sensing
更新于2025-09-09 09:28:46
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Computational Investigation of the Morphology, Efficiency, and Properties of Silver Nano Wires Networks in Transparent Conductive Film
摘要： Random networks of silver nano wires have been considered for use in transparent conductive films as an alternative to Indium Tin Oxide (ITO), which is unsuitable for flexible devices. However, the random distribution of nano wires makes such conductive films non-uniform. As electrical conductivity is achieved through a percolation process, understanding the scale-dependency of the macroscopic properties (like electrical conductivity) and the exact efficiency of the network (the proportion of nano wires that participate in electrical conduction) is essential for optimizing the design. In this paper, we propose a computational method for identifying the representative volume element (RVE) of nano wire networks. This defines the minimum pixel size in devices using such transparent electrodes. The RVE is used to compute the macroscopic properties of films and to quantify the electrically conducting efficiency of networks. Then, the sheet resistance and transparency of networks are calculated based on the predicted RVEs, in order to analyze the effects of nano wire networks on the electrical and optical properties of conductive films. The results presented in this paper provide insights that help optimizing random nano wire networks in transparent conductive films for achieving better efficiencies.
关键词： electrical conductivity,representative volume element,silver nano wires,optical transmittance,transparent conductive films
更新于2025-09-09 09:28:46
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Advanced Materials for Electromagnetic Shielding (Fundamentals, Properties, and Applications) || Silver Nanowires as Shielding Materials
摘要： To date, several advanced materials have been developed in order to resolve the issue of electromagnetic interference (EMI). Among those materials, intrinsic conductive polymers, metal/polymer composites, and conductive filler/polymer composites (CPCs) are the most commonly used and extensively investigated. Metals and their polymeric composites presents high EMI shielding effectiveness, and thus dominate the EMI shielding materials. Being lightweight, processable, and corrosion resistant are important technical requirements for many EMI shielding applications. Intrinsic conductive polymers can well meet these requirements due to their inherent properties. However, their low conductivity largely limited their shielding effectiveness. CPCs, which incorporate the aforementioned properties of polymers and high conductivity of the fillers, have attracted great interest in recent years.
关键词： Silver Nanowires,EMI Shielding Effectiveness,Conductive Composites,Shielding Materials,Electromagnetic Interference
更新于2025-09-04 15:30:14
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Polymer conductive fabric grid array antenna with pliable feature for wearable application
摘要： A flexible microstrip grid array antenna designed on polydimethylsiloxane (PDMS) substrate and copper conductive fabric as the patch and ground plane is presented. The proposed geometry designed at 15 GHz is made of 19 cells with 22 radiating elements. The proposed antenna achieves almost 40% wideband characteristics at ?10 dB reflection coefficient from 11.10 GHz until 16.2 GHz with measured maximum gain of 14.0 dBi in normal state. Analysis on performance of antenna at bend state with various value of bend radius has been done. The measured reflection coefficient shows low sensitivity to bending effect where the antenna operates well at designed frequency which is at 15 GHz. Due to these criteria, it is a suitable candidate for wearable applications.
关键词： 5G,microstrip grid array antenna (MGAA),conductive fabric,PDMS
更新于2025-09-04 15:30:14
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Development of Thermal Kinetic Inductance Detectors Suitable for X-ray Spectroscopy
摘要： We report on the development of thermal kinetic inductance detectors (TKIDs) suitable to perform X-ray spectroscopy measurements. The aim is to implement MKIDs sensors working in thermal quasi-equilibrium mode to detect X-ray photons as pure calorimeters. The thermal mode is a variation on the MKID classical way of operation that has generated interest in recent years. TKIDs can offer the MKIDs inherent multiplexibility in the frequency domain, a high spatial resolution comparable with CCDs, and an energy resolution theoretically limited only by thermodynamic fluctuations across the thermal weak links. Microresonators are built in Ti/TiN multilayer technology with the inductive part thermally coupled with a metal absorber on a suspended SiN membrane, to avoid escape of phonons from the film to the substrate. The mid-term goal is to optimize the single-pixel design in terms of superconducting critical temperatures, internal quality factors, kinetic inductance and spectral energy resolution. The final goal is to realize a demonstrator array for a next generation thousand pixels X-ray spectrometer. In this contribution, the status of the project after one year of developments is reported, with detailed reference to the microresonators design and simulations and to the fabrication process.
关键词： Thermal mode,Microwave kinetic inductance detectors,TKID,MKIDs,Thin film,X-ray spectroscopy,Superconducting film,Micromachining,Super-conductive microresonators,Thermal kinetic inductance detectors
更新于2025-09-04 15:30:14