Synthesis of Silver Nanowires with Reduced Diameters Using Benzoin-Derived Radicals to Make Transparent Conductors with High Transparency and Low Haze

Niu, Zhiqiang; Cui, Fan; Kuttner, Elisabeth; Xie, Chenlu; Chen, Hong; Sun, Yuchun; Dehestani, Ahmad; Schierle‐Arndt, Kerstin; Yang, Peidong

doi:10.1021/acs.nanolett.8b02479

Cited by 96 publications

(100 citation statements)

References 33 publications

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“…About 82 % specular transmittance and 27 Ω sq −1 sheet resistance were achieved with the Ag NTs, making them potential substitutes for the conventional indium tin oxide (ITO) in flexible electronics and solar cell applications. It is worth noting that excellent transmittance could be also achieved by reducing the diameter of the solid Ag NWs . Thus, our work provides an alternative approach to achieve this goal.…”

Section: Resultsmentioning

confidence: 88%

“…In addition, the optical extinction cross section of noble metal nanocrystals is highly related to their volumes . In light of this, hollowing out these nanocrystals may lead to significantly enhanced optical transmittance, favorable for flexible electronics and solar cell applications . During the past few years, a variety of strategies have been developed to synthesize such unique nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Liu

Fan

et al. 2018

Chemistry A European J

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Although hollow silver nanocrystals possess unique plasmonic properties, there is a lack of robust strategies to synthesize such nanocrystals with high efficiency and controllability. To solve this problem, a new surface‐protected etching strategy to convert solid Ag nanocrystals, which are widely available from conventional syntheses, into their hollow counterparts, producing a family of hollow Ag nanocrystals is reported. Hollow Ag nanospheres and nanotubes were prepared conveniently in this way. The key was the surface modification of Ag nanocrystals by a minor amount of Pt prior to a controllable etching process, which accounts for enhanced stability of the Ag surface and subsequent etching of Ag from the inner part of the nanocrystals while retaining the overall crystal morphology. These hollow Ag nanocrystals showed distinctive optical properties, as demonstrated by the enhanced optical transmittance of flexible electrodes fabricated with Ag nanotubes, compared to nanowires. These hollow Ag nanocrystals hold promise in different plasmonic and electronic applications.

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Liu

Fan

et al. 2018

Chemistry A European J

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“…However, the Ag NPs were inevitably produced simultaneously and could only be removed through an extra selective precipitation process. Based on the employment of benzoin‐derived radicals, the Yang group decreased the average diameters of Ag NWs to 13 nm and increased the aspect ratios up to 3000 (Figure b) . Through a modified facile protocol at atmospheric pressure, the Xia group successfully synthesized Ag NWs with turnable diameters from 20 nm to 40 nm in high‐morphology purity .…”

Section: G Ag Nws and The Derived Nanostructuresmentioning

confidence: 99%

Section: G Ag Nws and The Derived Nanostructuresmentioning

confidence: 99%

Nanowire Genome: A Magic Toolbox for 1D Nanostructures

Yang

Liang

et al. 2019

Advanced Materials

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1D nanomaterials with high aspect ratio, i.e., nanowires and nanotubes, have inspired considerable research interest thanks to the fact that exotic physical and chemical properties emerge as their diameters approach or fall into certain length scales, such as the wavelength of light, the mean free path of phonons, the exciton Bohr radius, the critical size of magnetic domains, and the exciton diffusion length. On the basis of their components, aspect ratio, and properties, there may be imperceptible connections among hundreds of nanowires prepared by different strategies. Inspired by the heredity system in life, a new concept termed the “nanowire genome” is introduced here to clarify the relationships between hundreds of nanowires reported previously. As such, this approach will not only improve the tools incorporating the prior nanowires but also help to precisely synthesize new nanowires and even assist in the prediction on the properties of nanowires. Although the road from start‐ups to maturity is long and fraught with challenges, the genetical syntheses of more than 200 kinds of nanostructures stemming from three mother nanowires (Te, Ag, and Cu) are summarized here to demonstrate the nanowire genome as a versatile toolbox. A summary and outlook on future challenges in this field are also presented.

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“…[19] In the polyol synthesis, silver nitrate (AgNO 3 ) is dissolved in ethylene glycol (EG) in the presence of a halide salt and a surfactant (typically polyvinylpyrrolidone, PVP). [18,[21][22][23][24] Besides being simple and high-yield, the polyol synthesis is also fast, with reaction times usually comprised between 30 min and 2 h. [18] Here, we synthesize AgNWs of ≈50 nm in diameter and ≈10 μm in length by adapting a previously reported method. [17,20] The length and diameter of the AgNWs can be easily tuned by controlling experimental parameters such as the reaction temperature and the ratio between the silver salt and the surfactant.…”

Section: Synthesis Of Silver Nanowires and Fabrication Of Nanowire Nementioning

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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Synthesis of Silver Nanowires with Reduced Diameters Using Benzoin-Derived Radicals to Make Transparent Conductors with High Transparency and Low Haze

Cited by 96 publications

References 33 publications

Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Nanowire Genome: A Magic Toolbox for 1D Nanostructures

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

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