Increasingly, copper nanopowders are commonly used in conductive inks due to their cost-efficiency compared to silver or gold and excellent electrical conductivity. One of the challenges associated with copper inks is oxidation and to address, we have developed a hybrid copper-based ink by removing the oxide layer of copper powders and coat the powders with a silver shell to protect from oxidation. Despite the advances, the inks are prone to fatigue failures when the ink films are repeatedly bent or stretched. In order to overcome this challenge, we proposed to integrate cellulose nanocrystals (CNC) with the copper-based ink on a polymer substrate and use a sintering process based on intense pulsed light in an argon atmosphere. Sintering in argon gas environment improved in electrical conductivity that may be the result of the partial carbonization of the CNC rather than combustion. It has also been experimentally determined that CNC improved adhesion strength of the copper ink film. Moreover, the addition of CNC also reduced the damage caused by bending and stretching. The ink film containing 10% CNC increased the electrical resistance by only 3.82 times after 600 bending cycles versus the resistance increased by 34.4 times without CNC. Under the 30% strain of stretching, the change in resistance of the ink film containing 10% CNC was 1.75 times lower than without CNC. It was observed through microscopy techniques that the presence of CNC reduced the formation of cracks by enhancing mechanical strength.

铜纳米粉越来越多地用于导电油墨中，这是因为与银或金相比，铜纳米粉具有成本效益，并且具有出色的导电性。与铜油墨有关的挑战之一是氧化，并且为了解决这一问题，我们已经开发了一种混合铜基油墨，它可以去除铜粉的氧化物层，并在粉体上涂上一层银壳以防止氧化。尽管取得了进步，但当油墨膜反复弯曲或拉伸时，油墨仍容易出现疲劳故障。为了克服这一挑战，我们建议将纤维素纳米晶体（CNC）与铜基油墨整合到聚合物基材上，并在氩气气氛中使用基于强脉冲光的烧结工艺。在氩气环境中进行烧结可提高电导率，这可能是由于CNC部分碳化而不是燃烧造成的。还通过实验确定CNC改善了铜墨膜的粘合强度。此外，CNC的添加还减少了弯曲和拉伸引起的损坏。含有10％CNC的油墨膜在600个弯曲循环后的电阻仅增加了3.82倍，而没有CNC的电阻增加了34.4倍。在30％的拉伸应变下，含有10％CNC的墨膜的电阻变化比没有CNC的墨膜低1.75倍。通过显微镜技术观察到，CNC的存在通过增强机械强度减少了裂纹的形成。还通过实验确定CNC改善了铜墨膜的粘合强度。此外，CNC的添加还减少了弯曲和拉伸引起的损坏。含有10％CNC的油墨膜在600个弯曲循环后的电阻仅增加了3.82倍，而没有CNC的电阻增加了34.4倍。在30％的拉伸应变下，含有10％CNC的墨膜的电阻变化比没有CNC的墨膜低1.75倍。通过显微镜技术观察到，CNC的存在通过增强机械强度减少了裂纹的形成。还通过实验确定CNC改善了铜墨膜的粘合强度。此外，CNC的添加还减少了弯曲和拉伸引起的损坏。含有10％CNC的油墨膜在600个弯曲循环后的电阻仅增加了3.82倍，而没有CNC的电阻增加了34.4倍。在30％的拉伸应变下，含有10％CNC的墨膜的电阻变化比没有CNC的墨膜低1.75倍。通过显微镜技术观察到，CNC的存在通过增强机械强度减少了裂纹的形成。含有10％CNC的油墨膜在600个弯曲循环后的电阻仅增加了3.82倍，而没有CNC的电阻增加了34.4倍。在30％的拉伸应变下，含有10％CNC的墨膜的电阻变化比没有CNC的墨膜低1.75倍。通过显微镜技术观察到，CNC的存在通过增强机械强度减少了裂纹的形成。含有10％CNC的油墨膜在600个弯曲循环后的电阻仅增加了3.82倍，而没有CNC的电阻增加了34.4倍。在30％的拉伸应变下，含有10％CNC的墨膜的电阻变化比没有CNC的墨膜低1.75倍。通过显微镜技术观察到，CNC的存在通过增强机械强度减少了裂纹的形成。