Facile fabrication of transparent and conductive nanowire networks by wet chemical etching with an electrospun nanofiber mask template

Azuma, Keisuke; Sakajiri, Koichi; Matsumoto, Hidetoshi; Kang, Sungmin; Watanabe, Junji; Tokita, Masatoshi

doi:10.1016/j.matlet.2013.10.054

Cited by 55 publications

(37 citation statements)

References 19 publications

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“…), and a suspension of Ag nanoparticles (NPK, Korea, average diameter: 40 ± 5 nm, solvent: ethylene glycol, concentration = 50 wt.%) was electrospun continuously onto the rotating substrate to form ultra-long AgNFs (inner nozzle size: 0.33 mm, outer nozzle size: 0.64 mm). [26][27][28][29]31,32 As shown in Supplementary Movie S1, this roll-based electrospinning system enabled the relatively rapid production of a transparent conductive film composed of a AgNF network with a large area (width of film: 30 cm, production speed: 1.5 m min − 1 in the film length). Compared with other printing methods (such as inkjet printing, electrohydrodynamic jet printing, imprinting, indirect electrospinninng and laserassisted printing) used to form transparent electrodes, 11,[26][27][28][29][33][34][35] this direct electrospinning of AgNFs is advantageous for the rapid production of large-area conductive films using a roll.…”

Section: Resultsmentioning

confidence: 99%

“…Details about the fabrication method of the electrospun metal NF network onto the flexible substrate can be found elsewhere. 26,[28][29][30][31] As a transparent electrode, the low-density AgNF networks formed by electrospinning for 5 s exhibited a significantly low sheet resistance of 1.3 ± 0.2 Ω per sq with a transmittance of 90%.…”

Section: Fabrication Of Ultra-long Agnf Random Network Electrodesmentioning

confidence: 99%

“…Therefore, conductive networks of 1D nanomaterials with ultra-high aspect ratios could be a solution to overcome the current limitations of NWs for stretchable, transparent heaters. [26][27][28][29][30][31][32] In this respect, percolating networks of ultra-long, 1D metal nanotroughs can be fabricated by depositing a metal onto a sacrificial polymeric substrate, electrospinning the polymer, and then selectively removing the polymer to produce a free-standing, nanofiber web as the template. 6,[26][27][28] Although the geometry of ultra-long nanotroughs can provide low R s levels (o17 Ω per sq for transmittance 490%), it requires multiple processing steps that can increase the overall fabrication cost, and it is difficult to produce large-area nanotrough films.…”

Section: Introductionmentioning

confidence: 99%

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Rapid production of large-area, transparent and stretchable electrodes using metal nanofibers as wirelessly operated wearable heaters

et al. 2017

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A rapidly growing interest in wearable electronics has led to the development of stretchable and transparent heating films that can replace the conventional brittle and opaque heaters. Herein, we describe the rapid production of large-area, stretchable and transparent electrodes using electrospun ultra-long metal nanofibers (mNFs) and demonstrate their potential use as wirelessly operated wearable heaters. These mNF networks provide excellent optoelectronic properties (sheet resistance of~1.3 Ω per sq with an optical transmittance of~90%) and mechanical reliability (90% stretchability). The optoelectronic properties can be controlled by adjusting the area fraction of the mNF networks, which also enables the modulation of the power consumption of the heater. For example, the low sheet resistance of the heater presents an outstanding power efficiency of 0.65 W cm − 2 (with the temperature reaching 250°C at a low DC voltage of 4.5 V), which is~10 times better than the properties of conventional indium tin oxide-based heaters. Furthermore, we demonstrate the wireless fine control of the temperature of the heating film using Bluetooth smart devices, which suggests substantial promise for the application of this heating film in next-generation wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Fabrication Of Ultra-long Agnf Random Network Electrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rapid production of large-area, transparent and stretchable electrodes using metal nanofibers as wirelessly operated wearable heaters

et al. 2017

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“…Instead of the metal grid, which has a complicated fabrication process and relatively poor stretchability, several methods of creating stretchable transparent electrodes based on metal nanofibers have been developed [58][59][60][61][62][63][64]. Among them, electrospinning is a method that is optimized to make continuous one-dimensional nanomaterials with polymers, oxides, and carbon [65,66].…”

Section: Metal Nanofibersmentioning

confidence: 99%

Nanomaterial-based stretchable and transparent electrodes

Kim

Hyun

Jang

et al. 2016

Journal of Information Display

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The recent advent of unprecedented wearable applications engendered the need for stretchable electronics, which can be realized by making the individual components stretchable. The transparent conducting electrode is one of the most important components of optoelectronic devices. Therefore, developing transparent electrodes in a stretchable form is essential for the implementation of stretchable electronics. In this paper, the recent efforts in the development of stretchable and transparent electrodes, particularly those using nanomaterials such as metal nanowires, metal nanofibers, and carbon nanotubes are introduced. ARTICLE HISTORY

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“…[3,6,7] Furthermore, large-area lithography and metal coating techniques are increasingly emerging as promising alternatives. [3,6,7] Furthermore, large-area lithography and metal coating techniques are increasingly emerging as promising alternatives.…”

mentioning

confidence: 99%

Terahertz Time‐Domain Spectroscopy and Near‐Field Microscopy of Transparent Silver Nanowire Networks

Hoof

Parente

Baldi

et al. 2019

Advanced Optical Materials

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spin-coating to spray-coating, electrospinning, and dip coating. [3,6,7] Furthermore, large-area lithography and metal coating techniques are increasingly emerging as promising alternatives. [8][9][10] However, it is not uncommon for these deposition techniques to result in a conductance that varies spatially due to local modulations in the network thickness or connectivity. These spatial modulations of the electrical conductance are impossible to detect with standard characterization techniques such as the four-point probe method, in which the electrical impedance is measured using a pair of separated electrodes carrying a current and sensing the voltage differences. Furthermore, although microprobes have been developed to map the conductance with high spatial resolution, [11] the four-point probe technique requires electrical contact with the surface, leading to the risk of modifying the sample. These limitations highlight the need for a contact-free and high resolution technique to map electrical conductance over large areas. Broadband and phase sensitive spectroscopic techniques, such as terahertz time-domain spectroscopy (THz-TDS), have emerged as powerful alternatives for probing the complex conductivity of samples. [12][13][14][15] THz-TDS uses very short (single cycle) electromagnetic pulses as low frequency electromagnetic probes to measure the electronic properties. This probing is done by measuring the attenuation and the phase of the THz pulse as it propagates through the medium and interacts (mainly) with free charge carriers. A major advantage of THz-TDS over four-point probe techniques is that it is a contact free technique, which also enables an easy implementation of conductivity scans. The diffraction limit of electromagnetic waves (on the order of the wavelength) defines the maximum spatial resolution that can be attained for the determination of the conductivity using far-field THz techniques. The broadband character of THz-TDS and the standard focusing optics, with relatively low numerical aperture, leads to spatial resolutions on the order of 1 mm or larger.In this manuscript, we synthesize highly monodisperse AgNWs with a diameter of ≈50 nm and a length of ≈10 μm by adapting a polyol method. [16] Subsequently, transparent electrodes are prepared by spray coating the AgNWs solution on top of 25 × 25 mm 2 quartz substrates. The nanowire monodispersity allows us to draw quantitative conclusions from the measurements performed on the conductive networks. We spatially vary the thickness of the AgNWs network across the quartz substrate, and therefore its optical transmission and THz conductance, by adjusting the spray coating conditions. Transparent conductive layers are key components of optoelectronic devices. Here, a polyol method is used to synthesize large quantities of monodisperse silver nanowires (AgNWs) and these are used to fabricate transparent conducting networks over large areas. The optical extinction and terahertz (THz) conductance of these networks are simultaneously investigated,...

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Facile fabrication of transparent and conductive nanowire networks by wet chemical etching with an electrospun nanofiber mask template

Cited by 55 publications

References 19 publications

Rapid production of large-area, transparent and stretchable electrodes using metal nanofibers as wirelessly operated wearable heaters

Rapid production of large-area, transparent and stretchable electrodes using metal nanofibers as wirelessly operated wearable heaters

Nanomaterial-based stretchable and transparent electrodes

Terahertz Time‐Domain Spectroscopy and Near‐Field Microscopy of Transparent Silver Nanowire Networks

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