The synthesis of silver nanowires with tunable diameters using halide ions for flexible transparent conductive films,CrystEngComm

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The synthesis of silver nanowires with tunable diameters using halide ions for flexible transparent conductive films
CrystEngComm ( IF 2.6 ) Pub Date : 2020-11-10 , DOI: 10.1039/d0ce01435d
Xingzhong Zhu _{1,

2,

3,

4} , Aoqi Guo _{1,

2,

3,

4} , Juan Xu _{1,

2,

3,

4} , Caixia Kan _{1,

2,

3,

4}

Affiliation

Ag nanowires (Ag NWs) have attracted great interest as the most promising candidate for the innovation-driven development of flexible transparent conductive films. The use of the halide ions Cl⁻ and Br⁻ is an effective method to reduce the diameter of Ag NWs. However, many research efforts have paid more attention to the role of Br⁻, neglecting the cooperative relationship between Cl⁻ and Br⁻ ions. Herein, we prepared Ag NWs with a high aspect ratio through tailoring the amounts and ratios of Cl⁻ and Br⁻ ions, together with the use of a syringe pump. The reaction process was monitored, and Cl⁻ and Br⁻ were employed to control the nucleation and elongation of the Ag NWs and to subsequently adjust the concentration of Ag⁺ to slow the reduction kinetics. Additionally, the uniformity and purity of the Ag NWs were dependent on the ratio between Cl⁻ and Br⁻, with the optimum point being 2 : 1. Ag NWs with tunable diameters from 35 to 19 nm and aspect ratios of up to 1500 were synthesized via adjusting the total concentration of halide ions while keeping their ratio constant. Flexible transparent conductive films based on the purified ultralong Ag NWs exhibit a low sheet resistance of 20 Ω sq⁻¹ and transmittance of 95% at 550 nm after being treated with NaBH₄ and spin-coated with polymethyl methacrylate. Furthermore, the obtained composite films could reach a temperature of 51 °C in 30 s at 3 V and return to room temperature at the same rate. Overall, the combination of Cl⁻ and Br⁻ could be used to effectively fabricate Ag NWs with tunable diameter, which have great potential for use in flexible transparent conductive films in the field of film heaters.

中文翻译：

使用卤离子用于柔性透明导电膜合成直径可调的银纳米线

银纳米线（Ag NWs）作为柔性驱动透明导电膜的创新驱动开发的最有希望的候选者，引起了人们极大的兴趣。使用卤化物离子氯^-和Br ^-是降低银纳米线的直径的有效方法。然而，许多研究工作更加重视，以BR的作用^-，忽视氯之间的合作关系^-和Br ^-离子。在此，我们制备的Ag纳米线具有高纵横比通过剪裁量和Cl的比率^-和Br ^-离子，通过使用注射泵在一起。将反应过程中监测和Cl ^-和Br ^-被用来控制的Ag纳米线的成核和伸长率，并且随后调整Ag的浓度⁺减慢还原动力学。另外，银纳米线的均匀性和纯度都依赖于氯之间的比率^-和Br ^-，与最佳点是2：1。的Ag纳米线与从35可调直径最多为19nm和宽高比1500合成通过调整卤离子的总浓度，同时保持其比例恒定。基于纯化的超长银纳米线的柔性透明导电膜在用NaBH ₄处理后表现出20Ωsq ^-1的低薄层电阻和550 nm下的95％的透射率然后用聚甲基丙烯酸甲酯旋涂。此外，所获得的复合膜可以在30 s内在3 V的温度下达到51°C的温度，并以相同的速率返回室温。总体而言，Cl组成的组合^-和Br ^-可被用于有效地编造的Ag纳米线具有可调的直径，其具有用于在薄膜加热器的场在柔性透明导电膜使用的巨大潜力。

更新日期：2020-11-21

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