scholarly journals Characterization of Silver Nanowire Layers in the Terahertz Frequency Range

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7399
Author(s):  
Aleksandra Przewłoka ◽  
Serguei Smirnov ◽  
Irina Nefedova ◽  
Aleksandra Krajewska ◽  
Igor S. Nefedov ◽  
...  
Keyword(s):  
Silver Nanowires ◽  
Silver Nanowire ◽  
Thin Layers ◽  
Frequency Range ◽  
Electrical And Optical Properties ◽  
Conductive Coatings ◽  
Communication Devices ◽  
Smith Model ◽  
Metal Nanowire

Thin layers of silver nanowires are commonly studied for transparent electronics. However, reports of their terahertz (THz) properties are scarce. Here, we present the electrical and optical properties of thin silver nanowire layers with increasing densities at THz frequencies. We demonstrate that the absorbance, transmittance and reflectance of the metal nanowire layers in the frequency range of 0.2 THz to 1.3 THz is non-monotonic and depends on the nanowire dimensions and filling factor. We also present and validate a theoretical approach describing well the experimental results and allowing the fitting of the THz response of the nanowire layers by a Drude–Smith model of conductivity. Our results pave the way toward the application of silver nanowires as a prospective material for transparent and conductive coatings, and printable antennas operating in the terahertz range—significant for future wireless communication devices.

scholarly journals Terahertz Conductivity of Silver Nanowire Layers

2021 ◽  
Author(s):  
Aleksandra Przewloka ◽  
Serguei Smirnov ◽  
Irina Nefedova ◽  
Aleksandra Krajewska ◽  
Igor Nefedov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Wireless Communication ◽  
Layer Structure ◽  
Silver Nanowires ◽  
Silver Nanowire ◽  
Frequency Range ◽  
Electrical And Optical Properties ◽  
Conductive Coatings ◽  
Communication Devices ◽  
Metal Nanowire

Abstract We present the study of the influence of different thin silver nanowire layers on electrical and optical properties in the Terahertz (THz) frequency range. We demonstrate that the absorbance, transmittance and reflectance of the metal nanowire layers in the frequency range of 0.2~THz to 1.2~THz is non-monotonic and depends on the nanowire dimensions and density. We present and validate also a theoretical approach describing well the experimental results and allowing to model the THz response as function the nanowire layer structure. Our results pave the way toward the application of silver nanowires as a perspective material for transparent and conductive coatings, and printable antennas operating in the terahertz range – significant for future wireless communication devices.

High Frequency Ultrasound, a Tool for Elastic Properties Measurement of Thin Films Fabricated on Silicon

2011 ◽  
Vol 324 ◽  
pp. 277-281 ◽  
Author(s):  
Pierre Campistron ◽  
Julien Carlier ◽  
Nadine Saad ◽  
Jamin Gao ◽  
Malika Toubal ◽  
...  
Keyword(s):  
Thin Films ◽  
Elastic Properties ◽  
High Frequency ◽  
Shear Waves ◽  
Thin Layers ◽  
Acoustic Properties ◽  
Frequency Range ◽  
Frequency Method ◽  
Longitudinal Waves

The main goal of this work is to develop an ultrasonic high frequency method for characterization of thin layers. The development of high frequency acoustic transducers for longitudinal waves and shear waves on silicon has enabeled the characterization of thin films deposited on this substrate. Three types of transducers have been achieved : (i) single crystal LiNbOSubscript text3 Y+163° for shear waves generation, and (ii) Y+36° for longitudinal waves, bonded and thinned on silicon substrate to achieve ultrasonic transducers in the frequency range 300-600 MHz ; (iii) thin films ZnO transducers were realized due to sputtering technologies working in the frequency range 1 GHz- 2.5 GHz. Using an inversion method and a network analyser which provide the scattering S11 parameter of the transducer versus the frequency we deduce the elastic properties of films deposited on the wafer surface. Thanks to these transducers the acoustic properties of thin films such as SU-8 based nanocomposites (doped with TiO2 , SrTiO3 or W nanoparticles) will be presented. In order to achieve mechanical impedance matching between silicon and water we control the mass of the embedded particles which provide a way to adjust the elastic properties of the characterized material. In another application an Indium metallic layer have been characterized in the high frequency range. We also use this method to characterize dielectric permittivity of the ZnO transducers.

Transparent Film Heaters based on Silver Nanowire Random Networks

2012 ◽  
Vol 1449 ◽  
Author(s):  
Jean-Pierre Simonato ◽  
Caroline Celle ◽  
Celine Mayousse ◽  
Alexandre Carella ◽  
Henda Basti ◽  
...  
Keyword(s):  
Silver Nanowires ◽  
Silver Nanowire ◽  
Random Networks ◽  
Transparent Film ◽  
Heating Rates ◽  
Large Area ◽  
High Heating ◽  
Fabrication And Characterization ◽  
Printing Techniques

ABSTRACTWe present the fabrication and characterization of transparent thin film heaters (TTFHs) based on silver nanowires. The goal is to develop a simple process for the production of transparent heating elements by large area printing techniques. The TTFHs are based on recently developed random networks of silver nanowires. Thanks to the very low sheet resistance achievable with silver nanowires, we show that it is possible to obtain high heating rates and good steady state temperatures at low voltages, typically below 12 V.

Fabrication and characterization of low-sheet-resistance and stable stretchable electrodes employing metal and metal nanowire hybrid structure

2021 ◽  
Author(s):  
Hyunjoo Cho ◽  
Seungjun Chung ◽  
Jaewook Jeong
Keyword(s):  
Sheet Resistance ◽  
Silver Nanowires ◽  
Hybrid Structure ◽  
Metal Electrodes ◽  
Single Strain ◽  
Current Path ◽  
Initial Resistance ◽  
Resistance Stability ◽  
Metal Nanowire

Abstract Stretchable electrodes with high stretching capability and low sheet resistance were developed using a metal/silver nanowires (AgNWs)/metal hybrid structure on a poly-dimethylsiloxane (PDMS) substrate. A low sheet resistance around 100 mΩ/square was achieved using the hybrid structures of Ag/AgNWs/Ag and Cu/AgNWs/Cu electrodes. The stretching capability under single and multi-cycling strain conditions was greatly improved due the AgNWs in-between top and bottom metal electrodes. The random connection of AgNWs generates new current path over the various cracks and wavy structures of the metal electrodes, which improve the initial resistance, the stretching capability of single strain up to 16 % and the resistance stability of 100 times cycling strain for the electrodes. Using a simple resistor model, it was shown that the hybrid structure is effective to improve the stretching capability of the stretchable metal electrodes due to random connection of AgNWs in-between the metal electrodes.

scholarly journals Fabrication and Investigating the Electrical and Optical Properties of Silver Nanowire/Indium Tin Oxide Transparent Conductive Electrodes  

2021 ◽  
Vol 31 (3) ◽  
pp. 58-62
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Figure Of Merit ◽  
Silver Nanowires ◽  
Silver Nanowire ◽  
Optical And Electrical Properties ◽  
Electrical And Optical Properties ◽  
Transparent Conductive Electrode ◽  
Direct Current Sputtering ◽  
Transparent Conductive Electrodes

In this study, we analyze the optical and electrical properties of silver nanowires/indium tin oxide transparent conductive electrode (TCE). Silver nanowire was synthesized by polyol method. ITO was deposited by direct-current sputtering. The diameter and length of the synthesized silver nanowire are in the range of 40-70 nm and 5-30 μm, respectively. The silver nanowire TCEs have a rather high resistance (~ 210 Ω /). After a layer of indium tin oxide sputtered on silver nanowire TCE, the resistance dropped sharply (~ 30.1 Ω/◻) corresponding to 84.1% transmittance at 550 nm. The figure of merit of this TCE is 68.3. This result shows that the fabricated silver naowire/indium tin oxide TCEs have great potential in application as window electrodes for solar cells and LED devices.

scholarly journals Azimuthal Anchoring Strength in Photopatterned Alignment of a Nematic

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 675
Author(s):  
H. Nilanthi Padmini ◽  
Mojtaba Rajabi ◽  
Sergij V. Shiyanovskii ◽  
Oleg D. Lavrentovich
Keyword(s):  
Liquid Crystal ◽  
Point Defects ◽  
Elastic Energy ◽  
Separation Distance ◽  
Thin Layers ◽  
Uv Exposure ◽  
Surface Anchoring ◽  
Anchoring Strength ◽  
Spatially Varying

Spatially-varying director fields have become an important part of research and development in liquid crystals. Characterization of the anchoring strength associated with a spatially-varying director is difficult, since the methods developed for a uniform alignment are seldom applicable. Here we characterize the strength of azimuthal surface anchoring produced by the photoalignment technique based on plasmonic metamsaks. The measurements used photopatterned arrays of topological point defects of strength +1 and −1 in thin layers of a nematic liquid crystal. The integer-strength defects split into pairs of half-integer defects with lower elastic energy. The separation distance between the split pair is limited by the azimuthal surface anchoring, which allows one to determine the strength of the latter. The strength of the azimuthal anchoring is proportional to the UV exposure time during the photoalignment of the azobenzene layer.

scholarly journals Recycling silver nanoparticle debris from laser ablation of silver nanowire in liquid media toward minimum material waste

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
June Sik Hwang ◽  
Jong-Eun Park ◽  
Gun Woo Kim ◽  
Hyeono Nam ◽  
Sangseok Yu ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Silver Nanoparticle ◽  
Building Materials ◽  
Raw Materials ◽  
Silver Nanowires ◽  
Silver Nanowire ◽  
Liquid Media ◽  
Ag Nps ◽  
Laser Patterning ◽  
Inexpensive Procedure

AbstractAs silver nanowires (Ag NWs) are usually manufactured by chemical synthesis, a patterning process is needed to use them as functional devices. Pulsed laser ablation is a promising Ag NW patterning process because it is a simple and inexpensive procedure. However, this process has a disadvantage in that target materials are wasted owing to the subtractive nature of the process involving the removal of unnecessary materials, and large quantities of raw materials are required. In this study, we report a minimum-waste laser patterning process utilizing silver nanoparticle (Ag NP) debris obtained through laser ablation of Ag NWs in liquid media. Since the generated Ag NPs can be used for several applications, wastage of Ag NWs, which is inevitable in conventional laser patterning processes, is dramatically reduced. In addition, electrophoretic deposition of the recycled Ag NPs onto non-ablated Ag NWs allows easy fabrication of junction-enhanced Ag NWs from the deposited Ag NPs. The unique advantage of this method lies in using recycled Ag NPs as building materials, eliminating the additional cost of junction welding Ag NWs. These fabricated Ag NW substrates could be utilized as transparent heaters and stretchable TCEs, thereby validating the effectiveness of the proposed process.

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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