Spray-assisted alignment of Layer-by-Layer assembled silver nanowires: a general approach for the preparation of highly anisotropic nano-composite films

Hu, Hongliang; Pauly, Matthias; Félix, Olivier; Decher, Gero

doi:10.1039/c6nr08045f

Cited by 77 publications

(90 citation statements)

References 57 publications

(43 reference statements)

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“…As more and more nanowires are deposited, the “free places” for new nanowires to interact with the PDMS substrate is limited, and the deposition rate reduces accordingly. As a result, the surface coverage reaches a plateau for longer coating times and this result is consistent with the other reports …”

Section: Resultssupporting

confidence: 93%

“…Some strategies such as rubbing, external field–assisted assembly, coassembly, bubble blowing, dip coating, printing, chemical bonding, strain‐release assembly, wrinkle‐assisted assembly, shear coating, and interface‐mediated assembly can lead to a single oriented layer. And some strategies including Langmuir–Blodgett technique, evaporation‐induced assembly, electrospinning, fluidic flow, spray coating, and brush coating can be repeated to form multilayered oriented structures. However, there are still some inherent limitations that severely restrict their applications as some of the above techniques require complicated process or specialized equipment such as additional transfer process, surface patterning, spraying nozzles, and special substrates, which limit the cost‐effective assembly of high‐density nanowires in a controlled manner.…”

Section: Introductionmentioning

confidence: 99%

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Aligned Silver Nanowires Enabled Highly Stretchable and Transparent Electrodes with Unusual Conductive Property

Wang

et al. 2019

Adv Funct Materials

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Transparent conductors for the next generation of soft electronic devices need to be highly stretchable, conductive, and transparent, while an inevitable challenge lies in enhancing them simultaneously. Cost-effective silver nanowires (AgNWs) are widely used but the conventional random network yields a high junction resistance as well as degraded conductivity in the stretched state. Here, a novel, facile, and versatile agitation-assisted assembly approach is reported to control the orientation direction and density of AgNWs and to layer-by-layer deposit the AgNWs monolayer or multilayers onto the prestrained soft substrate. This electrode demonstrates an unprecedented low sheet resistance of 2.8 Ω sq −1 as well as high transparency of 85% and high stretchability of 40%. It is interesting to note that contrary to most other reports, such a device shows higher conductivity in the stretched state compared to the released state. ] for comparison. The designed oriented AgNWs films exhibit relatively lower sheet resistance, higher or comparable transparency and stretchability simultaneously. b) Photograph of the illuminated LED biased at 3 V with our AgNWs-based electrode at the released state (left); photograph of the illuminated LED biased at 3 V using our AgNWs-based electrode when it was stretched for 40% (right). c) Photograph of the illuminated LED biased at 3 V using our AgNWs-based electrode when it was bended for about 180°.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Aligned Silver Nanowires Enabled Highly Stretchable and Transparent Electrodes with Unusual Conductive Property

Wang

et al. 2019

Adv Funct Materials

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“…It has been reported that AgNWs can be orderly deposited on solid substrate by using the grazing incidence spraying method (scheme shown as Figure S3 in Supporting Information) . Using these ordered AgNWs (Figure S4 a) as templates, it is possible to prepare aligned APS line patterns, which could also be used for assembly of small molecules and nanoparticles, generating corresponding aligned line patterns (optical image of the assembled AuNPs was shown as Figure S4 b).…”

Section: Figurementioning

confidence: 99%

“…[37] These AuNPs patterns provide at unable plasmonic structure, which has potential applications in the fields of SERS sensing and nanophotonics.It has been reportedt hat AgNWsc an be orderly deposited on solid substrate by using the grazing incidence spraying method (scheme shown as Figure S3 in Supporting Information). [39][40][41] Using these ordered AgNWs (Figure S4 a) as templates, it is possible to prepare alignedA PS line patterns, which could also be used for assembly of small molecules and nanoparticles, generating corresponding aligned line patterns (opticali mage of the assembled AuNPs was shown as Figure S4 b). In addition, more complex molecular patterns could also be preparedb yc ontrolling the assembly of AgNWs.The assembled nanoparticle patterns could be used for SERS detection.…”

mentioning

confidence: 99%

Silver Nanowire‐Templated Molecular Nanopatterning and Nanoparticle Assembly for Surface‐Enhanced Raman Scattering

Wang

Zhang

et al. 2019

Chemistry A European J

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Developing simple and cost‐efficient methods for fabricating molecular patterns is of great importance in the field of nanoscience and nanotechnology. Here, a simple and convenient method was developed for fabricating nanopatterns composed of positively charged silane molecules by using silver nanowires as templates. The as‐obtained silane pattern copies the shape of the silver nanowires and is only 0.7 nm thick, which can later be used for templated assembly of small molecules and nanoparticles of opposite charges. As a proof of concept, the resultant assembly could be further used for surface‐enhanced Raman scattering.

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“…However, processes requiring vacuum evaporation and RIE may be insufficiently cost‐effective and high‐throughput to manufacture Al WGPs. Bottom‐up approaches to fabricate WGPs have been attempted, such as colloidal assembly, metal‐containing block copolymers, and nanowire alignment . However, the limitations of the material selection and structural versatility caused unsatisfactory WGP performance.…”

Section: Introductionmentioning

confidence: 99%

Solution‐Processed Aluminum Nanogratings for Wire Grid Polarizers

Kang

Yun

Jang

et al. 2018

Advanced Optical Materials

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polarized light, the WGP behaves like a metallic mirror, which reflects the incident light because of its high effective extinction coefficient; for transverse magnetic (TM)-mode polarized light, the WGP acts as a dielectric layer, effectively transmitting the incident light. [4] Al is the most commonly used material for WGPs because its refractive indices having low real and high imaginary parts are adequate in providing high TM transmission and TE reflection ( Figure S1, Supporting Information). [4][5][6] Accordingly, the highest performance for both the TM transmittance and extinction ratio (ratio of TM-to TE-mode transmittances) is expected when using Al compared with other metals ( Figure S1g, Supporting Information). Moreover, Al is one of the most abundant metals on earth, low-cost, light-weight, and environmentally stable. Theoretically, an extinction ratio and TM transmittance exceeding 10 000 and 85%, respectively, are expected from sub-100 nm pitch Al WGP. [5,7] To fabricate high-aspect-ratio Al nanostructures, various fabrication processes have been proposed. Especially, nanoimprint lithography, which can produce polymer nanopatterns almost infinitely through repetitive replication from a single master mold, has been widely used. High-aspect-ratio Al nanostructure was formed on the sidewall of a nanoimprinted polymer template by angled metal evaporation and reactive ion etching (RIE). [8][9][10][11] Nanoimprinted polymer resist was also used as an etch mask to create Al nanostructures using RIE. [7,12] However, processes requiring vacuum evaporation and RIE may be insufficiently cost-effective and highthroughput to manufacture Al WGPs. Bottom-up approaches to fabricate WGPs have been attempted, such as colloidal assembly, [13,14] metal-containing block copolymers, [15] and nanowire alignment. [16][17][18] However, the limitations of the material selection and structural versatility caused unsatisfactory WGP performance. Although the formation of metal structures through both electro-and electroless plating has been proposed, a specifically modified template is required for the site-selective growth of metals. [19][20][21][22] For example, hydrophobic or insulating nanostructure was prepared while exposing the hydrophilic or conducting substrate on the bottom portions of the structures, which requires dry etching or photolithography. [19][20][21][22] Moreover, unlike noble metals, the formation of Al nanostructures using solution processes is rare because of the high reactivity of Al with both oxygen and water. Previous studies The wire grid polarizer (WGP) consisting of parallel metal nanogratings is an attractive alternative to conventional polarizers because it offers thin layer thickness, easy integration capability, and outstanding chemical and thermal stability. In this report, a facile solution process is proposed for fabricating Al WGPs. High-aspect-ratio Al nanostructures are formed in a 1D nanoimprinted template by electroless plating. Because of the geometrically irreversible deposition and ...

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Spray-assisted alignment of Layer-by-Layer assembled silver nanowires: a general approach for the preparation of highly anisotropic nano-composite films

Cited by 77 publications

References 57 publications

Aligned Silver Nanowires Enabled Highly Stretchable and Transparent Electrodes with Unusual Conductive Property

Aligned Silver Nanowires Enabled Highly Stretchable and Transparent Electrodes with Unusual Conductive Property

Silver Nanowire‐Templated Molecular Nanopatterning and Nanoparticle Assembly for Surface‐Enhanced Raman Scattering

Solution‐Processed Aluminum Nanogratings for Wire Grid Polarizers

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