Influence of the average molar mass of poly(<i>N</i>-vinylpyrrolidone) on the dimensions and conductivity of silver nanowires

Sonntag, Luisa; Eichler, Franziska; Weiß, Nelli; Bormann, Ludwig; Ghosh, Dhriti Sundar; Sonntag, Jannick M; Jordan, Rainer; Gaponik, Nikolai; Leo, Karl; Eychmüller, Alexander

doi:10.1039/c9cp00680j

Cited by 13 publications

(10 citation statements)

References 43 publications

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“…The PVP layer on AgNWs reported by other works is thicker (>1 nm). 33 Our results may be due to a lower ratio of PVP/AgNO 3 used compared to other classic polyol processes, as well as the amount of PVP being decreased during the purication step. 34 It has previously been shown that the sheet resistance of unannealed AgNW networks is lower when the PVP shell, an electrical insulator, is thinner.…”

mentioning

confidence: 68%

“…Typically in other works the resistance of the AgNW network before post-processing treatments (such as thermal annealing, chemical treatments, laser sintering and mechanical pressing) is much higher. 17,31 The evolution of the resistance versus temperature during a thermal ramp of 5 C min À1 in air was tracked in a sample having an initial sheet resistance of 8 U sq À1 (i.e. before any thermal treatment) (Fig.…”

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confidence: 99%

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Rapid synthesis of ultra-long silver nanowires for high performance transparent electrodes

et al. 2020

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confidence: 68%

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confidence: 99%

Rapid synthesis of ultra-long silver nanowires for high performance transparent electrodes

et al. 2020

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“…Typically, high ARs are achieved by dramatically increasing NW length which leads to a decrease in interfacial scattering events. [ 10,13,14 ] However, diameter also often changes in these studies, so it is unclear whether length or diameter is the true driving force behind the observed performance enhancements. Recent studies have shown that charge transport is dominated by the organic phase within the Te–PEDOT:PSS hybrid NW, and the improvement in TE performance is attributed to the interaction of the polymer with the inorganic NW surface.…”

Section: Figurementioning

confidence: 99%

Understanding Diameter and Length Effects in a Solution‐Processable Tellurium‐Poly(3,4‐Ethylenedioxythiophene) Polystyrene Sulfonate Hybrid Thermoelectric Nanowire Mesh

Gordon

Haas

Zaia

et al. 2021

Adv Elect Materials

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Organic–inorganic hybrids offer great promise as solution‐processable thermoelectric materials. However, they have struggled to surpass the performance of their rigid inorganic counterparts due, in part, to a lack of synthetic control and limited understanding of how inorganic nanostructure dimensions impact overall charge transport. While it has been hypothesized that length, diameter, and aspect ratio (AR) all impact electronic transport in hybrid nanowires, the field lacks clarity on the relative role of each. In this study, the experimental parameter of ligand molecular weight (MW) is investigated as a synthetic knob for modulating nanowire dimensions, as well as the deconvolution of nanowire length versus diameter impacts on electron transport. By increasing ligand MW, larger nanowire AR dispersions occur and an optimal power factor of ≈130 μWm−1 K−2 is achieved for a modest AR of 73. Power factors of this magnitude are thought to only be achievable in ultrahigh AR systems; representing a 183% increase in performance over literature reports with similar AR. Additionally, nanowire diameter is demonstrated to be a far more sensitive parameter for enhancing performance than modulating length. This study provides improved fundamental insight into rational synthetic design avenues for future enhancements in the performance of hybrid materials.

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“…Sonntag et al showed the necessity to use a minimum PVP chain length to synthesize AgNWs. They concluded that at their reaction condition the minimum MW of 55 kDa is required to synthesize AgNWs with a small diameter distribution [97]. Coskun et al showed that the PVP : AgNO 3 molar ratios (3 : 1, 4.5 : 1, 6 : 1, 7.5 : 1, 9 : 1, and 11 : 1) affect strongly the final morphology of the silver nanostructures.…”

Section: Effect Of Pvp Concentration and Molecular Weight As Amentioning

confidence: 99%

Polyol Silver Nanowire Synthesis and the Outlook for a Green Process

Hemmati

Harris

Barkey

2020

Journal of Nanomaterials

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Silver nanowires (AgNWs) have a broad range of applications including nanoelectronics, energy conversion, health care, solar cells, touch screens, sensors and biosensors, wearable electronics, and drug delivery systems. As their characteristics depend strongly on their size and morphology, it is essential to find the optimal and most cost-effective synthesis method with precise control over the size and morphology of the wires. Various methods for AgNW synthesis have been reported along with process optimization and novel techniques to increase the yield and aspect ratios of synthesized AgNWs. The most promising processes for synthesis of AgNWs are wet chemical techniques, in which the polyol process is low cost and simple and provides high yield compared to other chemical methods. Reaction mechanism is one of the most important factors in strategies to control the process. Our purpose here is to provide an overview on the main findings regarding synthesis, preparation, and characterization of AgNWs. Recent efforts in the polyol synthesis of AgNWs are summarized with respect to product morphology and size, reaction conditions, and characterization techniques. The effect of essential factors such as reagent concentration and preparation, temperature, and reaction atmosphere that control the size, morphology, and yield of synthesized AgNWs is reviewed. Moreover, a review on the novel modified polyol process and reactor design such as continuous millifluidic and flow reactors to increase the yield of synthesized AgNWs on large scales is provided. The most recent proposed growth mechanisms and kinetics behind the polyol process are addressed. Finally, comparatively few available studies in green and sustainable development of 1D silver nanostructures through the application of natural products with inherent growth termination, stabilization, and capping characteristics are reviewed to provide an avenue to natural synthesis pathways to AgNWs. Future directions in both chemical and green synthesis approaches of AgNWs are addressed.

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Influence of the average molar mass of poly(N-vinylpyrrolidone) on the dimensions and conductivity of silver nanowires

Abstract: Improving the performance of Ag nanowire electrodes by adjusting the reaction conditions and the molar mass of PVP.

Cited by 13 publications

References 43 publications

Rapid synthesis of ultra-long silver nanowires for high performance transparent electrodes

Rapid synthesis of ultra-long silver nanowires for high performance transparent electrodes

Understanding Diameter and Length Effects in a Solution‐Processable Tellurium‐Poly(3,4‐Ethylenedioxythiophene) Polystyrene Sulfonate Hybrid Thermoelectric Nanowire Mesh

Polyol Silver Nanowire Synthesis and the Outlook for a Green Process

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