通过一步无转移液态金属毛细管成型制备厘米级完全悬浮的金属及金属氧化物薄膜
Centimeter-scale fully suspended metal and metal oxide thin films by one-step transfer-free liquid metal capillary forming
AI总结：
本研究通过一步无转移液态金属毛细管成型技术，制备出厘米级、横向尺寸与厚度比达10^7量级的完全悬浮金属及金属氧化物薄膜，并实现了金属极小曲面薄壁结构快速原型制备与超高灵敏度声波检测。
AI中文摘要：
完全悬浮薄膜可解耦衬底效应，相比衬底支撑的薄膜提供额外调控自由度，是下一代薄膜器件的独特平台。本文报道通过液态金属毛细管成型实现厘米级超薄完全悬浮金属及金属氧化物薄膜结构的一步无转移无衬底制备。研究表明，类似肥皂膜形成过程，瞬时生成的几纳米厚天然表面氧化物可将多种液态金属层压为微米厚金属薄膜；令人惊讶的是，类表面活性剂的金属氧化物双层可在去湿诱导的液态金属排液过程中留存，形成横向尺寸与厚度比达10^7量级的悬浮二维薄膜。我们进一步利用这些悬浮薄膜平台展示了金属极小曲面薄壁结构的快速原型制备及超高灵敏度声波检测。
英文摘要：
Fully suspended thin films can decouple substrate effects and provide additional tuning degrees of freedom compared with their substrate-supported counterparts, making them unique platforms for next-generation thin film devices. Here we report one-step, transfer-free and substrate-free fabrication of centimeter-scale ultrathin fully suspended metal and metal oxide film structures via liquid metal capillary forming. We show that, analogous to soap film formation, the instantaneously developed few-nanometer-thick native surface oxide can laminate various liquid metals into micrometer-thick metallic films. Surprisingly, the surfactant-like metal oxide bilayer can survive dewetting-induced liquid metal drainage, forming suspended two-dimensional films featuring an enormous lateral size-to-thickness ratio on the order of 10^7. We further demonstrate rapid prototyping of metallic minimal-surface thin-walled structures and ultra-sensitive acoustic wave detection with these suspended thin film platforms.
