Che Lixuan, Hu Xiaoguang, Xu Hechen, Liu Yuanbo, Lv Cunjing, Kang Zhan, Wu Mengxi, Wen Rongfu, Wu Huaping, Cui Jiayi, Li Kun, Qi Guangliang, Luo Yangjun, Ma Xuehu, Sun Feiyi, Li Ming, Liu Junshan
State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment, Department of Engineering Mechanics, School of Mechanics and Aerospace Engineering, Dalian University of Technology, Dalian, 116024, China.
State Key Laboratory of High-performance Precision Manufacturing, Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, 116024, China.
Small. 2024 Apr;20(15):e2308312. doi: 10.1002/smll.202308312. Epub 2023 Nov 22.
Flexible and stretchable electronics have attractive applications inaccessible to conventional rigid electronics. However, the mainstream transfer printing techniques have challenges for electronic films in terms of thickness and size and limitations for target substrates in terms of curvature, depth, and interfacial adhesion. Here a facile, damage-free, and contamination-free soap film transfer printing technique is reported that enables the wrinkle-free transfer of ultrathin electronic films, precise alignment in a transparent manner, and conformal and adhesion-independent printing onto various substrates, including those too topographically and adhesively challenging by existing methods. In principle, not only the pattern, resolution, and thickness of transferred films, but also the curvature, depth, and adhesion of target substrates are unlimited, while the size of transferred films can be as high as meter-scale. To demonstrate the capabilities of soap film transfer printing, pre-fabricated ultrathin electronics with multiple patterns, single micron resolution, sub-micron thickness, and centimeter size are conformably integrated onto the ultrathin web, ultra-soft cotton, DVD-R disk with the minimum radius of curvature of 131 nm, interior cavity of Klein bottle and dandelion with ultralow adhesion. The printed ultrathin sensors show superior conformabilities and robust adhesion, leading to engineering opportunities including electrocardiogram (ECG) signal acquisition and temperature measurement in aqueous environments.
柔性和可拉伸电子器件具有传统刚性电子器件无法实现的诱人应用。然而，主流的转移印刷技术在电子薄膜的厚度和尺寸方面存在挑战，在目标基板的曲率、深度和界面附着力方面也存在局限性。本文报道了一种简便、无损伤且无污染的肥皂膜转移印刷技术，该技术能够实现超薄电子薄膜的无褶皱转移、以透明方式精确对准，并在各种基板上进行保形且与附着力无关的印刷，包括那些现有方法在地形和附着力方面极具挑战性的基板。原则上，不仅转移薄膜的图案、分辨率和厚度，而且目标基板的曲率、深度和附着力都没有限制，而转移薄膜的尺寸可高达米级。为了展示肥皂膜转移印刷的能力，将具有多种图案、单微米分辨率、亚微米厚度和厘米尺寸的预制超薄电子产品保形集成到超薄纤维网、超柔软的棉花、最小曲率半径为131纳米的DVD - R盘、克莱因瓶的内腔以及附着力超低的蒲公英上。印刷的超薄传感器表现出卓越的保形性和牢固的附着力，带来了包括在水环境中采集心电图（ECG）信号和进行温度测量等工程应用机会。
