铜纳米线(Cu NWs)具有长径比高、导电性优良且成本低等优点,广泛应用于柔性电子器件电极、透明导电薄膜、传感器及锂离子电池负极材料。由于产物形貌与尺寸可控,且工艺操作简单、成本较低,水热法广泛应用于Cu NWs的制备。然而,水热法中常用的封端剂烷基胺的水溶性极低,限制了Cu NWs长径比的提高。通过引入表面活性剂椰油酰胺丙基甜菜碱来提高铜-胺络合物的溶解度,合成了平均直径为(38.67±6.01)nm、长度约为50μm,长径比为1292的Cu NWs。为改善Cu NWs的抗氧化性,采用抗坏血酸作为还原剂,在Cu NWs表面包覆Ag壳层,得到核壳结构的银包铜纳米线(Cu@Ag NWs)。热重分析、X射线衍射和电导率等分析结果表明,Ag壳层进一步提高了Cu NWs的电导率和抗氧化性。
Copper nanowires (Cu NWs) exhibit superior properties including high aspect ratio,excellent electrical conductivity,and low cost,thus finding widespread applications in electrodes of flexible electronic devices,transparent conductive films,sensors,and anode materials for lithium-ion batteries.The hydrothermal method is extensively employed for the synthesis of Cu NWs due to its advantages of controllable product morphology and size,simple operation,and low cost.However,alkylamine,the commonly used capping agent in the hydrothermal process,suffers from extremely low water solubility,which restricts the further improvement of the aspect ratio of Cu NWs.In this work,a surfactant,cocamidopropyl betaine (CAPB),was introduced to enhance the solubility of copper-amine complexes,enabling the synthesis of Cu NWs with an average diameter of (38.67±6.01)nm,a length of approximately 50μm,and an aspect ratio of 1292.To improve the oxidation resistance of Cu NWs,ascorbic acid was utilized as a reducing agent to deposit a silver (Ag) shell on the surface of Cu NWs,yielding core-shell structured silver-coated copper nanowires (Cu@Ag NWs).Thermogravimetric analysis (TGA),X-ray diffraction (XRD),and electrical conductivity measurements were performed to characterize the samples.The results showed that the Ag shell not only enhanced the electrical conductivity but also significantly improved the oxidation resistance of Cu NWs.
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基金资助
国家新闻出版署智能与绿色柔版印刷重点实验室招标课题(ZBKT202406)
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