Environmentally responsive composite films fabricated using silk nanofibrils and silver nanowires

2018 ◽  
Vol 6 (47) ◽  
pp. 12940-12947 ◽  
Author(s):  
Jialin Liu ◽  
Tengyu He ◽  
Guangqiang Fang ◽  
Ranran Wang ◽  
Elbadawy A. Kamoun ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Humidity Sensor ◽  
Silver Nanowires ◽  
Composite Films ◽  
Silver Nanowire ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
Environmentally Responsive

Two kinds of silk nanofibril/silver nanowire composite films were fabricated by using a facile vacuum-filtration method, and can act as a humidity sensor or a pressure sensor.

scholarly journals Fabrication of Silver Nanowire/Polydimethylsiloxane Dry Electrodes by a Vacuum Filtration Method for Electrophysiological Signal Monitoring

ACS Omega ◽  
2020 ◽  
Vol 5 (18) ◽  
pp. 10260-10265 ◽  
Author(s):  
Ravinder Reddy Kisannagar ◽  
Pallavi Jha ◽  
Ambuja Navalkar ◽  
Samir K. Maji ◽  
Dipti Gupta
Keyword(s):  
Silver Nanowire ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
Dry Electrodes ◽  
Signal Monitoring ◽  
Electrophysiological Signal

scholarly journals Hexagonal and Square Patterned Silver Nanowires/PEDOT:PSS Composite Grids by Screen Printing for Uniformly Transparent Heaters

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 468 ◽  
Author(s):  
Xin He ◽  
Gengzhe Shen ◽  
Ruibin Xu ◽  
Weijia Yang ◽  
Chi Zhang ◽  
...  
Keyword(s):  
Screen Printing ◽  
Silver Nanowires ◽  
Composite Films ◽  
Silver Nanowire ◽  
Mass Ratio ◽  
Large Area ◽  
High Transparency ◽  
Square Grid ◽  
Photoelectric Properties ◽  
Printing Parameters

Transparent conductive films with hexagonal and square patterns were fabricated on poly(ethylene terephthalate) (PET) substrates by screen printing technology utilizing a poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) and silver nanowire (Ag NWs) composite ink. The printing parameters—mesh number, printing layer, mass ratio of PEDOT:PSS to Ag NWs and pattern shape—have a significant influence on the photoelectric properties of the composite films. The screen mesh with a mesh number of 200 possesses a suitable mesh size of 74 µm for printing clear and integrated grids with high transparency. With an increase in the printing layer and a decrease in the mass ratio of PEDOT:PSS to Ag NWs, the transmittance and resistance of the printed grids both decreased. When the printing layer is 1, the transmittance and resistance are 85.6% and 2.23 kΩ for the hexagonal grid and 77.3% and 8.78 kΩ for the square grid, indicating that the more compact arrangement of square grids reduces the transmittance, and the greater number of connections of the square grid increases the resistance. Therefore, it is believed that improved photoelectric properties of transparent electrodes could be obtained by designing a printing pattern with optimized printing parameters. Additionally, the Ag NWs/PEDOT:PSS composite films with hexagonal and square patterns exhibit high transparency and good uniformity, suggesting promising applications in large-area and uniform heaters.

Highly flexible and conductive composite films of silk fibroin and silver nanowires for optoelectronic devices

RSC Advances ◽  
2015 ◽  
Vol 5 (63) ◽  
pp. 50878-50882 ◽  
Author(s):  
Ning Qi ◽  
Bing Zhao ◽  
Shu-Dong Wang ◽  
Salem S. Al-Deyab ◽  
Ke-Qin Zhang
Keyword(s):  
Silk Fibroin ◽  
Silver Nanowires ◽  
Composite Films ◽  
Optoelectronic Devices ◽  
Silver Nanowire ◽  
Ion Sputtering ◽  
Conductive Composite

Silver nanowire-coated silk fibroin composite films assisted by ion sputtering exhibited excellent flexibility, conductivity, which used to light LED device.

scholarly journals Electrical anisotropy and multidimensional pressure sensor of aligned Fe3O4@silver nanowire/polyaniline composite films under an extremely low magnetic field

RSC Advances ◽  
2017 ◽  
Vol 7 (8) ◽  
pp. 4260-4268 ◽  
Author(s):  
Fang Fang ◽  
Yuan-Qing Li ◽  
Gui-Wen Huang ◽  
Hong-Mei Xiao ◽  
Qing-Ping Feng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Composite Film ◽  
Pressure Sensor ◽  
Composite Films ◽  
Silver Nanowire ◽  
Electrical Anisotropy ◽  
Pani Composite ◽  
Low Magnetic Field ◽  
Ag Nanowire

The PDMS sealed aligned Ag nanowire/PANI composite film as a multi-dimensional pressure sensor.

scholarly journals Scalable Solution-Processed Fabrication Approach for High-Performance Silver Nanowire/MXene Hybrid Transparent Conductive Films

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1360
Author(s):  
Pengchang Wang ◽  
Chi Zhang ◽  
Majiaqi Wu ◽  
Jianhua Zhang ◽  
Xiao Ling ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
High Performance ◽  
Silver Nanowires ◽  
Composite Films ◽  
Ambient Air ◽  
Optical Transmittance ◽  
Silver Nanowire ◽  
Solution Processed ◽  
Transparent Conductive Films ◽  
Conductive Films

The transparent conductive films (TCFs) based on silver nanowires are expected to be a next-generation electrode for flexible electronics. However, their defects such as easy oxidation and high junction resistance limit its wide application in practical situations. Herein, a method of coating Ti3C2Tx with different sizes was proposed to prepare silver nanowire/MXene composite films. The solution-processed silver nanowire (AgNW) networks were patched and welded by capillary force effect through the double-coatings of small and large MXene nanosheets. The sheet resistance of the optimized AgNW/MXene TCFs was 15.1 Ω/sq, the optical transmittance at 550 nm was 89.3%, and the figure of merit value was 214.4. Moreover, the AgNW/MXene TCF showed higher stability at 1600 mechanical bending, annealing at 100 °C for 50 h, and exposure to ambient air for 40 days. These results indicate that the novel AgNW/MXene TCFs have a great potential for high-performance flexible optoelectronic devices.

scholarly journals A silver nanowire-based flexible pressure sensor to measure the non-nutritive sucking power of neonates

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Jean G. de Oliveira ◽  
Tausif Muhammad ◽  
Sohee Kim
Keyword(s):  
Preterm Infants ◽  
Pressure Sensor ◽  
Mechanical Stability ◽  
Resistance To Change ◽  
Silver Nanowires ◽  
Silver Nanowire ◽  
Sensing Element ◽  
Term Infants ◽  
Nutritive Sucking ◽  
Flexible Pressure Sensor

Abstract Preterm infants are prone to have higher risks of morbidity, disability and developmental delay compared to term infants. The primitive reflexes, inborn behaviors found in early life development, are shown to be a good tool to assess the integrity of the central nervous system of infants and to predict potential malfunctions. Among these reflexes, the non-nutritive sucking reflex plays an important role in indicating congenital abnormalities in brain development and feeding readiness, especially for premature infants. Conventionally, pediatricians evaluate the oral sucking power qualitatively based on their experiences, by using a gloved finger put inside the infant’s mouth. Thus, more quantitative solutions to assess the sucking power of preterm infants are necessary to support healthcare professionals in their evaluation procedures. Here, we developed a silver nanowire (AgNW)-based flexible pressure sensor to measure the non-nutritive sucking power of infants. The flexible sensor was fabricated using silver nanowires deposited on polydimethylsiloxane (PDMS) in a sandwich-like structure. The sensor based on the principle of strain gauge was attached to a ring-shaped connecting module, and then to a pacifier. The negative sucking pressure exerted by the infant deformed the sensor membrane, causing its electrical resistance to change without any contact between the infant’s mouth and the sensing element. The fabricated sensor was characterized and optimized to achieve both the suitable sensitivity and stability. Thanks to the excellent long-term electro-mechanical stability and high sensitivity, the developed sensor is expected to provide the means to quantitatively assess the non-nutritive sucking of infants, with a portable, low-cost, non-invasive and light-weight solution.

scholarly journals Silver nanowire coated knitted wool fabrics for wearable electronic applications

2019 ◽  
Vol 14 ◽  
pp. 155892501985622 ◽  
Author(s):  
Alper Gurarslan ◽  
Büşra Özdemir ◽  
İbrahim Halil Bayat ◽  
Mustafa Berke Yelten ◽  
Güneş Karabulut Kurt
Keyword(s):  
Electronic Properties ◽  
Pressure Sensor ◽  
Dielectric Material ◽  
Silver Nanowires ◽  
Silver Nanowire ◽  
Electronic Textiles ◽  
Flexible Electrode ◽  
Wool Fabrics ◽  
Wool Fibers ◽  
Wearable Electronic

This study demonstrates a first example of silver nanowire coated wool fibers for wearable electronic applications. Silver nanowires were synthesized according to the polyol method and then drop casted on knitted wool fabrics. Electronic properties of the knitted samples were investigated under cyclic bending conditions. Conductive fabrics were isolated with a dielectric material and used as capacitance to measure respiration and finger motions. In addition, the same capacitor was employed as a pressure sensor and touch-based sensor for lighting up an LED. This study demonstrates that silver nanowire coated knitted wool fabrics can be used in electronic textiles not only as a flexible electrode but also as a capacitor for different applications.

scholarly journals Effect of Silver Nanowire Plasmons on Graphene Oxide Coatings Reduction for Highly Transparent Electrodes

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Xingzhen Yan ◽  
Lu Zhou ◽  
Xuefeng Chu ◽  
Huan Wang ◽  
Fan Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Structures ◽  
Uv Light ◽  
Silver Nanowires ◽  
Composite Films ◽  
Visible Spectrum ◽  
Silver Nanowire ◽  
Environmental Stability ◽  
Composite Electrodes ◽  
Spectrum Region

We prepared transparent conducting composite electrodes composed of silver nanowires (Ag NWs) and reduced graphene oxide (r-GO). We present a simple approach to welding the cross-positions of the Ag NWs by applying pressure at a relatively low temperature (100°C). We examined the Ag NWs/r-GO composite films in terms of their transmission, conductivity, and stability. The plasmonic features of the Ag NWs were used to assist the ultraviolet (UV) light-induced reduction of the GO coating. The r-GO coatings used to form Ag NWs/r-GO composite structures increased the conductivity of the film by providing more efficient electron conductive pathways. The G/D intensity ratios of the GO and r-GO produced by the UV light-induced method without and with Ag NWs were 0.95, 1.01, and 1.04, respectively. The lowest sheet resistance of the composite films was 7 ohm/sq with approximately 82% transparency in the visible spectrum region. No degradation of the films was observed after 2 months. This excellent environmental stability might facilitate applications of Ag NWs/r-GO composite films in optoelectronic devices.

scholarly journals Flexible Metal/Polymer Composite Films Embedded with Silver Nanowires as a Stretchable and Conductive Strain Sensor for Human Motion Monitoring

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 372 ◽  
Author(s):  
Jinjin Luan ◽  
Qing Wang ◽  
Xu Zheng ◽  
Yao Li ◽  
Ning Wang
Keyword(s):  
Polymer Composite ◽  
Silver Nanowires ◽  
Composite Films ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Human Motion ◽  
Applied Strain ◽  
Potential Candidate ◽  
Flexible Metal ◽  
Metal Polymer

To avoid conductive failure due to the cracks of the metal thin film under external loads for the wearable strain sensor, a stretchable metal/polymer composite film embedded with silver nanowires (AgNWs) was examined as a potential candidate. The combination of Ag film and AgNWs enabled the fabrication of a conductive film that was applied as a high sensitivity strain sensor, with gauge factors of 7.1 under the applied strain of 0–10% and 21.1 under the applied strain of 10–30%. Furthermore, the strain sensor was demonstrated to be highly reversible and remained stable after 1000 bending cycles. These results indicated that the AgNWs could act as elastic conductive bridges across cracks in the metal film to maintain high conductivity under tensile and bending loads. As such, the strain sensor engineered herein was successfully applied in the real-time detection and monitoring of large motions of joints and subtle motions of the mouth.

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