Fu Qi-Qi, Li Yu-Da, Li Hui-Hui, Xu Liang, Wang Zhi-Hua, Yu Shu-Hong
Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China.
Langmuir. 2019 Mar 26;35(12):4364-4369. doi: 10.1021/acs.langmuir.9b00042. Epub 2019 Mar 13.
Copper nanowires (Cu NWs) are among ideal candidates for fabricating various advanced nanodevices, especially flexible electronics and transparent conductive electrodes. However, although many efforts have been made, the commercialization of Cu NWs is still difficult. Herein, we report an in situ seed-mediated two-step strategy to synthesize well-defined Cu NWs in high yield. In the first step, that is, seed formation process, most Cu ions (85%) in situ transform to nondecahedral Cu nanodots (NDs). These Cu NDs can promote the formation of decahedral multiply twinned particles (DMTPs) and the subsequent growth of Cu NWs by selectively inhibiting the spontaneous ripening of nanoparticle (NP) byproducts in the second step. The amount and quality of Cu NDs play an important role in high-yield production of Cu NWs, and the yield was successfully increased to 2.4 times higher than that of the conventional methods. Furthermore, an effective shaking-rotating purification technique was developed to fully separate Cu NWs from the final product solution. After scaling up the reaction, 50 g of high-quality Cu NWs can be produced with a uniform size and high aspect ratio at a very low material cost of $ 0.99/g. These promising results not only provide a high-yield and low-cost synthetic route but also can promote the widespread commercialization of Cu NWs in advanced nanodevices.
铜纳米线（Cu NWs）是制造各种先进纳米器件的理想候选材料之一，尤其是在柔性电子学和透明导电电极方面。然而，尽管已经做出了许多努力，Cu NWs的商业化仍然困难重重。在此，我们报道了一种原位种子介导的两步法策略，以高产率合成定义明确的Cu NWs。在第一步，即种子形成过程中，大多数铜离子（85%）原位转化为非十面体铜纳米点（NDs）。这些Cu NDs可以通过在第二步中选择性抑制纳米颗粒（NP）副产物的自发熟化来促进十面体多重孪晶颗粒（DMTPs）的形成以及随后Cu NWs的生长。Cu NDs的数量和质量在Cu NWs的高产率生产中起着重要作用，并且产率成功提高到比传统方法高2.4倍。此外，还开发了一种有效的振荡旋转纯化技术，以将Cu NWs与最终产物溶液完全分离。在扩大反应规模后，可以以0.99美元/克的极低材料成本生产50克尺寸均匀、长径比高的高质量Cu NWs。这些有前景的结果不仅提供了一种高产率、低成本的合成路线，而且还可以促进Cu NWs在先进纳米器件中的广泛商业化。
