Large-Area Direct Laser-Shock Imprinting of a 3D Biomimic Hierarchical Metal Surface for Triboelectric Nanogenerators
Large-Area Direct Laser-Shock Imprinting of a 3D Biomimic Hierarchical Metal Surface for Triboelectric Nanogenerators
复制标题
DOI：
10.1002/adma.201705840
复制
发表时间：
2018-03-15
影响因子：
29.4
通讯作者：
Cheng, Gary J.
中科院分区：
文献类型：
--
作者：
Jin, Shengyu;Wang, Yixiu;Cheng, Gary J.
摩擦电纳米发电机（TENG）的持续努力重点是增强发电能力，但有关TENG经济且具有成本效益的生产的障碍仍然存在。聚合物表面的微/纳米结构工程主要用于提高接触摩擦起电，沉积金属电极用于收集的能量。然而，这种最先进的方法受到生产具有高质量金属的适形覆盖的3D分层表面结构的模糊潜力的限制。激光冲击压印（LSI）是一种潜在的可扩展的方法，用于直接表面图案化的各种金属的三维纳米结构的设计，受益于超高应变率形成过程。在这里，TENG设备展示了LSI处理的仿生分层结构的金属电极，用于有效地收集环境中的水滴能量。从天然模板（例如树叶）模仿分层微结构并将其转移到这些水-TENG装置中对于从装置表面排斥水滴是有效的，因为来自这些生物微结构的表面疏水性使TENG输出最大化。在各种叶子的微观结构中，干竹叶的分层微观结构在最大化功率输出方面是优选的，这归因于其独特的结构，与其他类型的叶子相比，既包含密集的纳米结构又包含微米尺度特征。此外，摩擦电输出显着改善密切模仿的疏水性的叶子在LSI处理的金属表面后，功能化它与低表面能自组装单层。该方法为新的可制造TENG技术打开了大门，用于经济可行和生态友好的功能设备生产，具有直接图案化的3D仿生金属表面，用于能源，电子和传感器应用。
Ongoing efforts in triboelectric nanogenerators (TENGs) focus on enhancing power generation, but obstacles concerning the economical and cost-effective production of TENGs continue to prevail. Micro-/nanostructure engineering of polymer surfaces has been dominantly utilized for boosting the contact triboelectrification, with deposited metal electrodes for collecting the scavenged energy. Nevertheless, this state-of-the-art approach is limited by the vague potential for producing 3D hierarchical surface structures with conformable coverage of high-quality metal. Laser-shock imprinting (LSI) is emerging as a potentially scalable approach for directly surface patterning of a wide range of metals with 3D nanoscale structures by design, benefiting from the ultrahigh-strain-rate forming process. Here, a TENG device is demonstrated with LSI-processed biomimetic hierarchically structured metal electrodes for efficient harvesting of water-drop energy in the environment. Mimicking and transferring hierarchical microstructures from natural templates, such as leaves, into these water-TENG devices is effective regarding repelling water drops from the device surface, since surface hydrophobicity from these biomicrostructures maximizes the TENG output. Among various leaves' microstructures, hierarchical microstructures from dried bamboo leaves are preferable regarding maximizing power output, which is attributed to their unique structures, containing both dense nanostructures and microscale features, compared with other types of leaves. Also, the triboelectric output is significantly improved by closely mimicking the hydrophobic nature of the leaves in the LSI-processed metal surface after functionalizing it with low-surface-energy self-assembled-monolayers. The approach opens doors to new manufacturable TENG technologies for economically feasible and ecologically friendly production of functional devices with directly patterned 3D biomimic metallic surfaces in energy, electronics, and sensor applications.