Colloidal Nanosurfactants for 3D Conformal Printing of 2D van der Waals Materials
Colloidal Nanosurfactants for 3D Conformal Printing of 2D van der Waals Materials
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DOI：
10.1002/adma.202003081
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发表时间：
2020-08
影响因子：
29.4
通讯作者：
Minxiang Zeng;Wenzheng Kuang;Irfan Khan;Dali Huang;Yipu Du;Mortaza Saeidi-Javash;Lecheng Zhang;Zhengdong Cheng;A. Hoffman;Yanliang Zhang
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文献类型：
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作者：
Minxiang Zeng;Wenzheng Kuang;Irfan Khan;Dali Huang;Yipu Du;Mortaza Saeidi-Javash;Lecheng Zhang;Zhengdong Cheng;A. Hoffman;Yanliang Zhang
使用纳米材料的打印技术已成为快速原型制作和潜在大规模制造功能设备的通用工具。表面活性剂在许多印刷过程中起着重要作用，因为它们能够降低油墨溶剂和纳米颗粒之间的界面张力，从而改善油墨胶体稳定性。在这里，一种基于胶体石墨烯量子点（GQD）的纳米表面活性剂被报道用于稳定水性油墨中的各种类型的2D材料。特别地，具有上级胶体稳定性的石墨烯墨水通过GQD纳米表面活性剂经由π-π堆叠相互作用而被证明，导致使用单个印刷通过在各种基底上印刷多个高分辨率图案。研究发现，与传统分子表面活性剂相比，纳米表面活性剂可以显着提高印刷石墨烯薄膜的机械稳定性，100次贴胶带、100次刮擦和1000次弯曲循环即可证明这一点。此外，印刷的复合膜使用具有400 nm波长的UV光表现出改善的光电导，这是由跨纳米表面活性剂带隙的激发引起的。利用3D保形气溶胶喷射印刷技术，一系列异质结构的UV传感器直接印刷在2D平面和3D球形基底上，展示了基于纳米表面活性剂油墨制造几何通用器件的潜力。
Printing techniques using nanomaterials have emerged as a versatile tool for fast prototyping and potentially large‐scale manufacturing of functional devices. Surfactants play a significant role in many printing processes due to their ability to reduce interfacial tension between ink solvents and nanoparticles and thus improve ink colloidal stability. Here, a colloidal graphene quantum dot (GQD)‐based nanosurfactant is reported to stabilize various types of 2D materials in aqueous inks. In particular, a graphene ink with superior colloidal stability is demonstrated by GQD nanosurfactants via the π–π stacking interaction, leading to the printing of multiple high‐resolution patterns on various substrates using a single printing pass. It is found that nanosurfactants can significantly improve the mechanical stability of the printed graphene films compared with those of conventional molecular surfactant, as evidenced by 100 taping, 100 scratching, and 1000 bending cycles. Additionally, the printed composite film exhibits improved photoconductance using UV light with 400 nm wavelength, arising from excitation across the nanosurfactant bandgap. Taking advantage of the 3D conformal aerosol jet printing technique, a series of UV sensors of heterogeneous structures are directly printed on 2D flat and 3D spherical substrates, demonstrating the potential of manufacturing geometrically versatile devices based on nanosurfactant inks.