scholarly journals New Insights into Flexible Transparent Conductive Silver Nanowires Films

2019 ◽  
Vol 20 (11) ◽  
pp. 2803
Author(s):  
Yuehui Wang ◽  
Xing Yang ◽  
Dexi Du ◽  
Yuzhen Zhao ◽  
Xianfeng Zhang
Keyword(s):  
Sheet Resistance ◽  
Silver Nanowires ◽  
Electronic Devices ◽  
Average Diameter ◽  
Research Direction ◽  
Design Guidelines ◽  
Optoelectronic Properties ◽  
Root Mean Square Roughness ◽  
Conductive Films ◽  
Important Research Direction

Flexible transparent conductive films (FTCFs) composed of silver nanowires (AgNWs) have become an important research direction because of their potential in flexible electronic devices. The optoelectronic properties of FTCFs composed of AgNWs of different lengths were evaluated in this study. AgNWs, with an average diameter of about 25 nm and length of 15.49–3.92 μm were obtained by a sonication-induced scission process. AgNW-FTCFs were prepared on polyethylene terephthalate substrates using a Meyer bar and then dried in the ambient environment. The sheet resistance, non-uniformity factor of the sheet resistance, the root mean square roughness, and haze of the FTCFs increased as the length of AgNWs decreased. The transmittance of the films increased slightly as the length of AgNWs increased. AgNWs with a length of 15.49 μm provided an AgNW-FTCF with excellent properties including haze of 0.95%, transmittance of 93.42%, and sheet resistance of 80.15 Ω∙sq−1, without any additional post-treatment of the film. This work investigating the dependence of the optoelectronic properties of AgNW-FTCFs on AgNW length provides design guidelines for development of AgNW-FTCFs.

scholarly journals Fibers and Conductive Films Using Silver Nanoparticles and Nanowires by Near-Field Electrospinning Process

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Cheng-Tang Pan ◽  
Tsung-Lin Yang ◽  
Yi-Chian Chen ◽  
Cherng-Yuh Su ◽  
Shin-Pon Ju ◽  
...  
Keyword(s):  
Thin Films ◽  
Silver Nanoparticles ◽  
Sheet Resistance ◽  
Silver Nanowires ◽  
Near Field ◽  
Electrospinning Process ◽  
Conductive Films ◽  
Conductive Film ◽  
The Future ◽  
Transparent Conductive Electrodes

The silver nanowires (AgNWs) and silver nanoparticles (AgNPs) were synthesized. With near-field electrospinning (NFES) process, fibers and thin films with AgNPs and AgNWs were fabricated. In the NFES process, 10 k voltage was applied and the AgNPs and AgNWs fibers can be directly orderly collected without breaking and bending. Then, the characteristics of the fibers were analyzed by four-point probe and EDS. The conductive film was analyzed. When the thickness of films with AgNWs and AgNPs was 1.6 µm, the sheet resistance of films was 0.032 Ω/sq which was superior to that of the commercial ITO. The transmissivity of films was analyzed. The transmissivity was inversely proportional to sheet resistance of the films. In the future, the fibers and films can be used as transparent conductive electrodes.

scholarly journals Synthesis and Applications of Silver Nanowires for Transparent Conductive Films

Micromachines ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 330 ◽  
Author(s):  
Yue Shi ◽  
Liang He ◽  
Qian Deng ◽  
Quanxiao Liu ◽  
Luhai Li ◽  
...  
Keyword(s):  
Silver Nanowires ◽  
Electronic Devices ◽  
Polyol Method ◽  
Concentration Addition ◽  
Synthesis Methods ◽  
Electrochromic Devices ◽  
Comprehensive Description ◽  
One Dimensional ◽  
Conductive Films ◽  
Transparent Conductive Electrodes

Flexible transparent conductive electrodes (TCEs) are widely applied in flexible electronic devices. Among these electrodes, silver (Ag) nanowires (NWs) have gained considerable interests due to their excellent electrical and optical performances. Ag NWs with a one-dimensional nanostructure have unique characteristics from those of bulk Ag. In past 10 years, researchers have proposed various synthesis methods of Ag NWs, such as ultraviolet irradiation, template method, polyol method, etc. These methods are discussed and summarized in this review, and we conclude that the advantages of the polyol method are the most obvious. This review also provides a more comprehensive description of the polyol method for the synthesis of Ag NWs, and the synthetic factors including AgNO3 concentration, addition of other metal salts and polyvinyl pyrrolidone are thoroughly elaborated. Furthermore, several problems in the fabrication of Ag NWs-based TCEs and related devices are reviewed. The prospects for applications of Ag NWs-based TCE in solar cells, electroluminescence, electrochromic devices, flexible energy storage equipment, thin-film heaters and stretchable devices are discussed and summarized in detail.

scholarly journals Rapid and Facile Synthesis of High-Performance Silver Nanowires by a Halide-Mediated, Modified Polyol Method for Transparent Conductive Films

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1139
Author(s):  
Lin Cao ◽  
Qin Huang ◽  
Jie Cui ◽  
Huaijun Lin ◽  
Wei Li ◽  
...  
Keyword(s):  
High Performance ◽  
Silver Nanowires ◽  
Average Length ◽  
Average Diameter ◽  
Silver Nanowire ◽  
Polyol Method ◽  
Synthesis Process ◽  
Transparent Conductive Films ◽  
Conductive Films ◽  
Modified Polyol Method

Silver nanowires are receiving increasing attention as a kind of prospective transparent and conductive material. Here, we successfully synthesized high-performance silver nanowires with a significantly decreased reaction time by a modified polyol method. The synthesis process involved the addition of halides, including NaCl and NaBr, to control the release rate of Ag+ ions, as Cl− and Br− ions react with Ag+ ions to form AgCl and AgBr with different solubilities. As a result, Ag+ ions could be slowly released by graded dissolution, and the formation of silver nanowires was promoted. The results showed that the concentration of the added halides played an important role in the morphology of the final product. High-quality silver nanowires with an average diameter of 70 nm and average length of 21 μm were obtained by optimizing the reaction parameters. Afterwards, a simple silver nanowire coating was applied in order to fabricate the transparent conductive films. The film that was based on the silver nanowires provided a transmittance of 91.2% at the 550 nm light wavelength and a sheet resistance of about 78.5 Ω·sq−1, which is promising for applications in flexible and transparent optoelectronic devices.

scholarly journals One-Step Synthesis of Silver Nanowires with Ultra-Long Length and Thin Diameter to Make Flexible Transparent Conductive Films

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 401 ◽  
Author(s):  
Yuxiu Li ◽  
Ximin Yuan ◽  
Hongwei Yang ◽  
Yunxiu Chao ◽  
Shuailong Guo ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Sheet Resistance ◽  
Silver Nanowires ◽  
Average Length ◽  
Synthesis Method ◽  
Average Diameter ◽  
Hydroxyethyl Cellulose ◽  
Molar Ratio ◽  
Conductive Film ◽  
One Step

High aspect ratio silver nanowires (AgNWs) with ultra-long length and thin diameter were synthesized through bromine ion (Br−)-assisted one-step synthesis method. The bromine ions were used as pivotal passivating agent. When the molar ratio of Br−/Cl− was 1:4, the average diameter of AgNWs was as low as ~40 nm, the average length was as high as ~120 μm, and the aspect ratio reached 2500. Networks of AgNWs were fabricated using as-prepared high-quality AgNWs as conducting material and hydroxyethyl cellulose (HEC) as the adhesive polymer. As a result, a low sheet resistance down to ~3.5 Ω sq−1 was achieved with a concomitant transmittance of 88.20% and a haze of 4.12%. The ultra-low sheet resistance of conductive film was attributed to the long and thin AgNWs being able to form a more effective network. The adhesion of the AgNWs to the substrate was 0/5B (ISO/ASTM). The insights given in this paper provide the key guidelines for bromine ion-assisted synthesis of long and thin AgNWs, and further designing low-resistance AgNW-based conductive film for optoelectronic devices.

scholarly journals One-step synthesis of ultra-long silver nanowires of over 100 μm and their application in flexible transparent conductive films

RSC Advances ◽  
2018 ◽  
Vol 8 (15) ◽  
pp. 8057-8063 ◽  
Author(s):  
Yuxiu Li ◽  
Shuailong Guo ◽  
Hongwei Yang ◽  
Yunxiu Chao ◽  
Shaozhuang Jiang ◽  
...  
Keyword(s):  
Sheet Resistance ◽  
Silver Nanowires ◽  
Optical Transmittance ◽  
Transparent Conductive Films ◽  
Conductive Films ◽  
High Optical Transmittance ◽  
One Step

Ultra-long silver nanowires (100–160 μm) were applied in flexible transparent conductive films showing low sheet resistance and high optical transmittance.

scholarly journals 2D and 3D Palmprint and Palm Vein Recognition Based on Neural Architecture Search

2021 ◽  
Author(s):  
Wei Jia ◽  
Wei Xia ◽  
Yang Zhao ◽  
Hai Min ◽  
Yan-Xiang Chen
Keyword(s):  
Deep Learning ◽  
Recognition Performance ◽  
Research Direction ◽  
Palmprint Recognition ◽  
Neural Architecture ◽  
Development Direction ◽  
Vein Recognition ◽  
Palm Vein ◽  
2D And 3D ◽  
Important Research Direction

AbstractPalmprint recognition and palm vein recognition are two emerging biometrics technologies. In the past two decades, many traditional methods have been proposed for palmprint recognition and palm vein recognition and have achieved impressive results. In recent years, in the field of artificial intelligence, deep learning has gradually become the mainstream recognition technology because of its excellent recognition performance. Some researchers have tried to use convolutional neural networks (CNNs) for palmprint recognition and palm vein recognition. However, the architectures of these CNNs have mostly been developed manually by human experts, which is a time-consuming and error-prone process. In order to overcome some shortcomings of manually designed CNN, neural architecture search (NAS) technology has become an important research direction of deep learning. The significance of NAS is to solve the deep learning model’s parameter adjustment problem, which is a cross-study combining optimization and machine learning. NAS technology represents the future development direction of deep learning. However, up to now, NAS technology has not been well studied for palmprint recognition and palm vein recognition. In this paper, in order to investigate the problem of NAS-based 2D and 3D palmprint recognition and palm vein recognition in-depth, we conduct a performance evaluation of twenty representative NAS methods on five 2D palmprint databases, two palm vein databases, and one 3D palmprint database. Experimental results show that some NAS methods can achieve promising recognition results. Remarkably, among different evaluated NAS methods, ProxylessNAS achieves the best recognition performance.

Towards effective link prediction: A hybrid similarity model

2020 ◽  
pp. 1-14
Author(s):  
Longjie Li ◽  
Lu Wang ◽  
Hongsheng Luo ◽  
Xiaoyun Chen
Keyword(s):  
Link Prediction ◽  
Structural Similarity ◽  
Research Direction ◽  
Structural Features ◽  
Proposed Model ◽  
Similarity Model ◽  
Weight Calculation ◽  
Stable Performance ◽  
Grey Relation ◽  
Important Research Direction

Link prediction is an important research direction in complex network analysis and has drawn increasing attention from researchers in various fields. So far, a plethora of structural similarity-based methods have been proposed to solve the link prediction problem. To achieve stable performance on different networks, this paper proposes a hybrid similarity model to conduct link prediction. In the proposed model, the Grey Relation Analysis (GRA) approach is employed to integrate four carefully selected similarity indexes, which are designed according to different structural features. In addition, to adaptively estimate the weight for each index based on the observed network structures, a new weight calculation method is presented by considering the distribution of similarity scores. Due to taking separate similarity indexes into account, the proposed method is applicable to multiple different types of network. Experimental results show that the proposed method outperforms other prediction methods in terms of accuracy and stableness on 10 benchmark networks.

scholarly journals Recent Progress of Fluxgate Magnetic Sensors: Basic Research and Application

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1500
Author(s):  
Songrui Wei ◽  
Xiaoqi Liao ◽  
Han Zhang ◽  
Jianhua Pang ◽  
Yan Zhou
Keyword(s):  
Recent Progress ◽  
Electronic Devices ◽  
Basic Research ◽  
Research Direction ◽  
Magnetic Sensor ◽  
Magnetic Sensors ◽  
Future Research ◽  
Calibration Methods ◽  
Wearable Electronic ◽  
Wearable Electronic Devices

Fluxgate magnetic sensors are especially important in detecting weak magnetic fields. The mechanism of a fluxgate magnetic sensor is based on Faraday’s law of electromagnetic induction. The structure of a fluxgate magnetic sensor mainly consists of excitation windings, core and sensing windings, similar to the structure of a transformer. To date, they have been applied to many fields such as geophysics and astro-observations, wearable electronic devices and non-destructive testing. In this review, we report the recent progress in both the basic research and applications of fluxgate magnetic sensors, especially in the past two years. Regarding the basic research, we focus on the progress in lowering the noise, better calibration methods and increasing the sensitivity. Concerning applications, we introduce recent work about fluxgate magnetometers on spacecraft, unmanned aerial vehicles, wearable electronic devices and defect detection in coiled tubing. Based on the above work, we hope that we can have a clearer prospect about the future research direction of fluxgate magnetic sensor.

All solution-processed silver nanowires composite silica nanospheres antireflection structure with synergetic optoelectronic performance

2021 ◽  
Author(s):  
Yuxin Tang ◽  
Wanying Yin ◽  
Yue Huang ◽  
Ganghua Zhang ◽  
Qingbiao Zhao ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Silver Nanowires ◽  
Great Promise ◽  
Silica Nanospheres ◽  
Solution Processed ◽  
Transparent Conductive Films ◽  
Conductive Films

Silver nanowires (AgNWs) network has shown great promise as transparent conductive films (TCFs) due to its excellent optoelectronic performance. In order to replace indium tin oxide (ITO), considerable intricate methods...

scholarly journals Effects of Concentration and Spin Speed on the Optical and Electrical Properties of Silver Nanowire Transparent Electrodes

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2219
Author(s):  
Xiaopeng Li ◽  
Jiayue Zhou ◽  
Dejun Yan ◽  
Yong Peng ◽  
Yong Wang ◽  
...  
Keyword(s):  
Sheet Resistance ◽  
Spin Coating ◽  
Figure Of Merit ◽  
Silver Nanowires ◽  
Solution Concentration ◽  
Ethanol Solution ◽  
Silver Nanowire ◽  
Optical And Electrical Properties ◽  
Transparent Electrodes ◽  
Spin Speed

In this paper, silver nanowires (AgNWs) with a diameter of 40 nm and a length of 45 μm were dispersed into an ethanol solution to prepare AgNW solutions with concentrations of 1, 2, and 3 mg/mL, respectively. The AgNW solutions were then deposited on a glass substrate using spin-coating at 1000, 2000, and 3000 rpm for 45 s, respectively, to prepare transparent electrodes. The results showed that the distribution of AgNWs on the substrate increased in density with the increase in the AgNW solution concentration and the decrease in spin speed. The effect of concentration on the distribution of AgNWs was greater than that of the spin speed. The transmittance of each electrode was between 84.19% and 88.12% at 550 nm, the average sheet resistance was between 20.09 and 358.11 Ω/sq, the highest figure of merit (FoM) was 104.42, and the lowest haze value was 1.48%. The electrode prepared at 1000 rpm with a concentration of 2 mg/mL and that prepared at 3000 rpm with a concentration of 3 mg/mL were very similar in terms of the average sheet resistance, transmittance at 550 nm, FoM, and haze value; thus, these two electrodes could be considered equivalent. The haze value of the electrode was positively correlated with the spin speed at low concentration, but that relationship became inverse as the concentration rose. For the AgNWs used in this experiment with an aspect ratio of 1125, the concentration of the AgNW solution should reach at least 2 mg/mL to ensure that the FoM of the electrode is greater than 35.

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