scholarly journals Improvement of Electro-Optical Properties of PSLC Devices by Silver Nanowire Doping

2019 ◽  
Vol 9 (1) ◽  
pp. 145 ◽  
Author(s):  
Xudong Yan ◽  
Wei Liu ◽  
Yong Zhou ◽  
Dong Yuan ◽  
Xiaowen Hu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Response Time ◽  
Frequency Modulation ◽  
Silver Nanowire ◽  
Driving Voltage ◽  
State Response ◽  
Ag Nanowires ◽  
20 Nm ◽  
Polymer Stabilized ◽  
Ag Nanowire

Polymer stabilized liquid crystal (PSLC) devices modulating the light that goes through them have broad applications. In this study, to improve the electro-optical properties of a PSLC device, Ag nanowires with diameter about 20 nm were doped into PSLC active layer with different concentrations. The influence of Ag nanowires concentration on the driving voltage, on-state response time and frequency modulation characteristics of a PSLC device were studied. The results indicate that the doping of Ag nanowires can reduce the driving voltage of PSLC cell up to 42%. The response time of the PSLC cell can decrease by about 41%. Meanwhile, frequency modulation does not show significant improvement upon Ag nanowire doping. Overall, Ag nanowire doping can improve the electro-optical properties of PSLC device effectively.

scholarly journals Electro-Optical Performance of Organic Thin-Film Using HAT(CN)6 between Anode and Organic Materials

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 648 ◽  
Author(s):  
Hong-Gyu Park ◽  
Sang-Geon Park
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Current Density ◽  
Carrier Transport ◽  
Hole Injection ◽  
Driving Voltage ◽  
Organic Thin Film ◽  
20 Nm ◽  
Injection Barrier ◽  
A Current

We report the electro-optical properties of an organic thin-film by varying the thickness of 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT(CN)6), included therein as an interlayer. Devices with HAT(CN)6, which are 7 nm thin films used as interlayers, exhibited good current density–voltage characteristics due to an improved hole injection barrier resulting from carrier ladder effects and carrier transport phenomena. The device without an interlayer showed the worst driving voltage characteristics due to the hole injection barrier. At low driving voltages, a device using 7 nm HAT(CN)6 as an interlayer exhibited a current density about 9.9 times higher than that of a device using 20 nm HAT(CN)6, and showed a current density about 9600 times higher than that of a device without an interlayer. Due to the proper carrier balance, the device using 7 nm HAT(CN)6 as an interlayer achieved a maximum current efficiency of 10.8 cd/A, which was the highest among the devices studied. This shows that the electro-optical properties of devices using HAT(CN)6 as an interlayer are dominated by the holes.

The Influence of 4,4’-bis[6-(acryloyloxy)-hexyloxy]biphenyl Contents on the Electro-Optical Properties of Polymer Stabilized Liquid Crystals

2013 ◽  
Vol 634-638 ◽  
pp. 2523-2526
Author(s):  
Hui Chang ◽  
Wen Juan Fan ◽  
Xiao Li Liu ◽  
Hong Ying Huo
Keyword(s):  
Optical Properties ◽  
Liquid Crystals ◽  
Response Time ◽  
Polymer Network ◽  
Contrast Ratio ◽  
Monomer Concentration ◽  
Helical Structure ◽  
Switching Process ◽  
Polymer Stabilized ◽  
Structure Of Liquid

The polymer stabilized liquid crystals (PSLC) films was prepared subsequently based on the mesogenic diacrylate monomer 4,4’-bis[6-(acryloyloxy)-hexyloxy]biphenyl (BAB6). The effects of BAB6 on the morphology of polymer network as well as the electro-optical properties of the PSLC films were investigated. The helical structure of liquid crystals was observed in the morphology of polymer network by SEM. Further, a single switching process was observed at lower monomer concentration in this study compared with the former publication. When BAB6 concentration reached 7 %, the response time and contrast ratio of PSLC film were 7 ms and 16.8, respectively.

scholarly journals Novel Hybrid Conductor of Irregularly Patterned Graphene Mesh and Silver Nanowire Networks

Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 578 ◽  
Author(s):  
Hiesang Sohn ◽  
Weon Shin ◽  
Dohyeong Seok ◽  
Taek Lee ◽  
Chulhwan Park ◽  
...  
Keyword(s):  
Optical Properties ◽  
Treatment Time ◽  
Optical Transmittance ◽  
Hybrid Structure ◽  
Silver Nanowire ◽  
Bottom Side ◽  
Nanowire Networks ◽  
Chemical Etchant ◽  
Ag Nanowire ◽  
Hybrid Conductor

We prepared the hybrid conductor of the Ag nanowire (NW) network and irregularly patterned graphene (GP) mesh with enhanced optical transmittance (~98.5%) and mechano-electric stability (ΔR/Ro: ~42.4% at 200,000 (200k) cycles) under 6.7% strain. Irregularly patterned GP meshes were prepared with a bottom-side etching method using chemical etchant (HNO3). The GP mesh pattern was judiciously and easily tuned by the regulation of treatment time (0–180 min) and concentration (0–20 M) of chemical etchants. As-formed hybrid conductor of Ag NW and GP mesh exhibit enhanced/controllable electrical-optical properties and mechano-electric stabilities; hybrid conductor exhibits enhanced optical transmittance (TT = 98.5%) and improved conductivity (ΔRs: 22%) compared with that of a conventional hybrid conductor at similar TT. It is also noteworthy that our hybrid conductor shows far superior mechano-electric stability (ΔR/Ro: ~42.4% at 200k cycles; TT: ~98.5%) to that of controls (Ag NW (ΔR/Ro: ~293% at 200k cycles), Ag NW-pristine GP hybrid (ΔR/Ro: ~121% at 200k cycles)) ascribed to our unique hybrid structure.

scholarly journals Microfluidic Optical Shutter Flexibly x-y Actuated via Electrowetting-on-Dielectrics with <20 ms Response Time

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Henning Fouckhardt ◽  
Johannes Strassner ◽  
Carina Heisel ◽  
Dominic Palm ◽  
Christoph Doering
Keyword(s):  
Optical Properties ◽  
Response Time ◽  
Visible Spectral Range ◽  
Contact Structures ◽  
Light Path ◽  
Cell Type ◽  
Electrically Conductive ◽  
Droplet Movement ◽  
In Series ◽  
Optical Shutter

Tunable microoptics deals with devices of which the optical properties can be changed during operation without mechanically moving solid parts. Often a droplet is actuated instead, and thus tunable microoptics is closely related to microfluidics. One such device/module/cell type is an optical shutter, which is moved in or out of the path of the light. In our case the transmitting part comprises a moving transparent and electrically conductive water droplet, embedded in a nonconductive blackened oil, that is, an opaque emulsion with attenuation of 30 dB at 570 nm wavelength over the 250 μm long light path inside the fluid (15 dB averaged over the visible spectral range). The insertion loss of the cell is 1.5 dB in the “open shutter” state. The actuation is achieved via electrowetting-on-dielectrics (EWOD) with rectangular AC voltage pulses of 2·90 V peak-to-peak at 1 kHz. To flexibly allow for horizontal, vertical, and diagonal droplet movement in the upright x-y plane, the contact structures are prepared such that four possible stationary droplet positions exist. The cell is configured as two capacitors in series (along the z axis), such that EWOD forces act symmetrically in the front and back of the 60 nl droplet with a response time of <20 ms.

Analysis of electro-optical properties of polymer-stabilized OCB and the application to TFT-LCDs

2009 ◽  
Vol 17 (8) ◽  
pp. 647 ◽  
Author(s):  
Yuko Kizu ◽  
Ray Hasegawa ◽  
Isao Amemiya ◽  
Shuichi Uchikoga ◽  
Hirofumi Wakemoto
Keyword(s):  
Optical Properties ◽  
Polymer Stabilized

Photo-induced fabrication of Ag nanowire circuitry for invisible, ultrathin, conformable pressure sensors

2017 ◽  
Vol 5 (38) ◽  
pp. 9986-9994 ◽  
Author(s):  
Chul Jong Han ◽  
Bum-Geun Park ◽  
Min Suk Oh ◽  
Seung-Boo Jung ◽  
Jong-Woong Kim
Keyword(s):  
Polyethylene Terephthalate ◽  
Pressure Sensors ◽  
Silver Nanowire ◽  
Pressure Sensitive ◽  
Nanowire Networks ◽  
Ag Nanowire

An ultrathin, transparent and stretch-compatible (up to 100% strain) pressure sensitive capacitor was achieved by developing a novel photo-induced patterning of silver nanowire networks deposited on a 1.4 μm thick polyethylene terephthalate sheet.

scholarly journals Highly stabilized flexible transparent capacitive photodetector based on silver nanowire/graphene hybrid electrodes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yooji Hwang ◽  
Young Hyun Hwang ◽  
Kwang Wook Choi ◽  
Seungwon Lee ◽  
Soojin Kim ◽  
...  
Keyword(s):  
Sheet Resistance ◽  
Dielectric Layer ◽  
Measurement Techniques ◽  
Current Measurement ◽  
Silver Nanowire ◽  
Semiconductor Materials ◽  
Graphene Electrode ◽  
Mechanical Durability ◽  
New Type ◽  
Ag Nanowire

AbstractThe need for photodetectors in various fields has gradually emerged, and several studies in this area are therefore being conducted. For photodetectors to be used in various environments, their transparency, flexibility, and durability must be ensured. However, the development of flexible photodetectors based on the current measurement techniques of conventional photodetectors has been difficult owing to the limitations of semiconductor materials. In this study, a new type of flexible and transparent capacitive photodetector was fabricated to address the shortcomings of conventional photodetectors. In addition, by introducing graphene electrodes to a new type of manufactured photodetector, devices with excellent overall chemical, thermal, and mechanical durability have been developed. Compared to photodetectors based on pristine Ag nanowire (AgNW) electrodes, AgNW/graphene hybrid electrode-based photodetectors exhibit a 20% higher photosensitivity. Also, the hybrid AgNW/graphene electrode on the dielectric layer exhibited low sheet resistance (~ 8 Ω/sq) and relatively high transmittance (~ 45%).

scholarly journals Nanostructured germanium deposited on heated substrates with enhanced photoelectric properties

2016 ◽  
Vol 7 ◽  
pp. 1492-1500 ◽  
Author(s):  
Ionel Stavarache ◽  
Valentin Adrian Maraloiu ◽  
Petronela Prepelita ◽  
Gheorghe Iordache
Keyword(s):  
Optical Properties ◽  
Response Time ◽  
Spectral Width ◽  
Fast Response ◽  
Superior Performance ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
Preparation Conditions ◽  
Photoelectric Properties ◽  
Transmission Electron

Obtaining high-quality materials, based on nanocrystals, at low temperatures is one of the current challenges for opening new paths in improving and developing functional devices in nanoscale electronics and optoelectronics. Here we report a detailed investigation of the optimization of parameters for the in situ synthesis of thin films with high Ge content (50 %) into SiO2. Crystalline Ge nanoparticles were directly formed during co-deposition of SiO2 and Ge on substrates at 300, 400 and 500 °C. Using this approach, effects related to Ge–Ge spacing are emphasized through a significant improvement of the spatial distribution of the Ge nanoparticles and by avoiding multi-step fabrication processes or Ge loss. The influence of the preparation conditions on structural, electrical and optical properties of the fabricated nanostructures was studied by X-ray diffraction, transmission electron microscopy, electrical measurements in dark or under illumination and response time investigations. Finally, we demonstrate the feasibility of the procedure by the means of an Al/n-Si/Ge:SiO2/ITO photodetector test structure. The structures, investigated at room temperature, show superior performance, high photoresponse gain, high responsivity (about 7 AW−1), fast response time (0.5 µs at 4 kHz) and great optoelectronic conversion efficiency of 900% in a wide operation bandwidth, from 450 to 1300 nm. The obtained photoresponse gain and the spectral width are attributed mainly to the high Ge content packed into a SiO2 matrix showing the direct connection between synthesis and optical properties of the tested nanostructures. Our deposition approach put in evidence the great potential of Ge nanoparticles embedded in a SiO2 matrix for hybrid integration, as they may be employed in structures and devices individually or with other materials, hence the possibility of fabricating various heterojunctions on Si, glass or flexible substrates for future development of Si-based integrated optoelectronics.

scholarly journals Ag–NYLON NANOCOMPOSITES BY DYNAMIC EMULSION POLYCONDENSATION

MRS Advances ◽  
2016 ◽  
Vol 1 (36) ◽  
pp. 2519-2524 ◽  
Author(s):  
Linqi Zhang ◽  
Sriharsha Karumuri ◽  
A. Kaan Kalkan
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Weight Fraction ◽  
Thermoplastic Polymer ◽  
Nylon 66 ◽  
Novel Technique ◽  
Nucleation Effect ◽  
Ag Nanowires ◽  
Ag Nanowire

ABSTRACTThe present work demonstrates a novel technique for dispersing nanofillers in a thermoplastic polymer, where polymerization and dispersion of the nanofillers occur simultaneously via dynamic emulsion polycondensation at ambient temperature. The composite is manufactured in the form of a uniform powder, which can then be molded into desired shape by melting or sintering. The technique is demonstrated for Ag nanowire / Nylon 66 composites. In this demonstration, Ag nanowires are synthesized by the polyol process. Polyvinylprrolidone (PVP) is used to functionalize the Ag nanowires. Nanocomposites with varying Ag content are prepared and investigated. The nanowires are found to be monodispersed and hydrogen-bonded to the Nylon 66 matrix through PVP. Glass transition temperature of the composites decreases from 61 to 48 °C with Ag weight fraction increasing from 0 to 6.47%. The depression of the glass transition temperature is owed to the plasticizer effect as well as heterogeneous nucleation effect of the nanowires for polymerization leading to shorter chain length.

The influence of single layer MoS2 flake on the propagated surface plasmons of silver nanowire

2021 ◽  
Author(s):  
Liu Lu ◽  
Tiantian Zhao ◽  
Lei Chen ◽  
Chenyang Wang ◽  
Zhiqiang Zhou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Single Layer ◽  
High Refractive Index ◽  
Transmission Efficiency ◽  
Silver Nanowire ◽  
Propagation Loss ◽  
Optical Barrier ◽  
Propagation Length ◽  
Simulation Results ◽  
Ag Nanowire

Abstract We demonstrate the enhancement of both excitation and transmission efficiency of the propagated surface plasmon (SP) of Ag nanowire (Ag NW) in hybrid Ag-MoS2 structure by contrasting the SP propagation of the same Ag NW on different substrates including silicon substrate, monolayer MoS2, or partially overlapping the Ag NW on MoS2 flake. The simulation results indicate that with the assistance of MoS2, the leaky radiation of the hybrid plasmonic modes of the H1 and H2 can be prominently suppressed by the high refractive index dielectric layer of the MoS2, which provides an optical barrier blocking the leaky radiation, resulting in the reduced propagation loss. Our work provides a feasible and effective method to enhance the SP propagation length.

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