Zha Xiangyun, Gong Depeng, Chen Wanyu, Wu Lili, Zhang Chaocan
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Nanomaterials (Basel). 2025 Apr 22;15(9):638. doi: 10.3390/nano15090638.
Copper nanowires (Cu NWs) are considered a promising alternative to indium tin oxide (ITO) and silver nanowires (Ag NWs) due to their excellent electrical conductivity, mechanical properties, abundant reserves, and low cost. They have been widely applied in various optoelectronic devices. In this study, Cu NWs were synthesized using copper chloride (CuCl) as the precursor, monoethanolamine (MEA) as the complexing agent, and hydrated hydrazine (NH) as the reducing agent under strongly alkaline conditions at 60 °C. Notably, this is the first time that MEA has been employed as a complexing agent in this synthesis method for Cu NWs. Through a series of experiments, the optimal conditions for the CuCl-MEA-NH system in Cu NWs synthesis were determined. This study revealed that the presence of amines plays a crucial role in nanowire formation, as the co-ordination of MEA with copper in this system provides selectivity for the nanowire growth direction. MEA prevents the excessive conversion of Cu(I) complexes into CuO octahedral precipitates and exhibits an adsorption effect during Cu NWs formation. The different adsorption tendencies of MEA at the nanowire ends and lateral surfaces, depending on its concentration, influence the growth of the Cu NWs, as directly reflected by changes in their diameter and length. At an MEA concentration of 210 mM, the synthesized Cu NWs have an average diameter of approximately 101 nm and a length of about 28 μm. To fabricate transparent conductive films, the Cu NW network was transferred onto a polyethylene terephthalate (PET) substrate by applying a pressure of 20 MPa using a tablet press to ensure strong adhesion between the Cu NW-coated mixed cellulose ester (MCE) filter membrane and the PET substrate. Subsequently, the MCE membrane was dissolved by acetone and isopropanol immersion. The resulting Cu NW transparent conductive film exhibited a sheet resistance of 52 Ω sq with an optical transmittance of 86.7%.
铜纳米线（Cu NWs）因其优异的导电性、机械性能、储量丰富和成本低廉，被认为是氧化铟锡（ITO）和银纳米线（Ag NWs）的一种很有前景的替代品。它们已被广泛应用于各种光电器件中。在本研究中，以氯化铜（CuCl）为前驱体，单乙醇胺（MEA）为络合剂，水合肼（NH）为还原剂，在60℃的强碱性条件下合成了Cu NWs。值得注意的是，这是首次在这种Cu NWs合成方法中使用MEA作为络合剂。通过一系列实验，确定了Cu NWs合成中CuCl-MEA-NH体系的最佳条件。该研究表明，胺的存在在纳米线形成中起着关键作用，因为MEA与该体系中的铜配位为纳米线的生长方向提供了选择性。MEA可防止Cu（I）络合物过度转化为CuO八面体沉淀，并在Cu NWs形成过程中表现出吸附作用。MEA在纳米线末端和侧面的不同吸附倾向取决于其浓度，会影响Cu NWs的生长，这直接反映在其直径和长度的变化上。在MEA浓度为210 mM时，合成的Cu NWs平均直径约为101 nm，长度约为28μm。为了制备透明导电膜，使用压片机在20 MPa的压力下将Cu NW网络转移到聚对苯二甲酸乙二酯（PET）基板上，以确保涂覆有Cu NW的混合纤维素酯（MCE）滤膜与PET基板之间有强附着力。随后，通过丙酮和异丙醇浸泡溶解MCE膜。所得的Cu NW透明导电膜的方块电阻为52Ω/sq，光学透过率为86.7%。
