Liu Pingwei, Liu Albert Tianxiang, Kozawa Daichi, Dong Juyao, Yang Jing Fan, Koman Volodymyr B, Saccone Max, Wang Song, Son Youngwoo, Wong Min Hao, Strano Michael S
State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nat Mater. 2018 Nov;17(11):1005-1012. doi: 10.1038/s41563-018-0197-z. Epub 2018 Oct 23.
Graphene and other two-dimensional materials possess desirable mechanical, electrical and chemical properties for incorporation into or onto colloidal particles, potentially granting them unique electronic functions. However, this application has not yet been realized, because conventional top-down lithography scales poorly for producing colloidal solutions. Here, we develop an 'autoperforation' technique that provides a means of spontaneous assembly for surfaces composed of two-dimensional molecular scaffolds. Chemical vapour deposited two-dimensional sheets can autoperforate into circular envelopes when sandwiching a microprinted polymer composite disk of nanoparticle ink, allowing liftoff into solution and simultaneous assembly. The resulting colloidal microparticles have two independently addressable, external Janus faces that we show can function as an intraparticle array of vertically aligned, two-terminal electronic devices. Such particles demonstrate remarkable chemical and mechanical stability and form the basis of particulate electronic devices capable of collecting and storing information about their surroundings, extending nanoelectronics into previously inaccessible environments.
石墨烯和其他二维材料具有理想的机械、电学和化学性质，可用于掺入胶体颗粒或附着在其表面，这可能赋予它们独特的电子功能。然而，这种应用尚未实现，因为传统的自上而下光刻技术在制备胶体溶液时缩放效果不佳。在这里，我们开发了一种“自动穿孔”技术，该技术为由二维分子支架组成的表面提供了一种自发组装方式。当夹在纳米颗粒墨水的微印刷聚合物复合盘中间时，化学气相沉积的二维薄片可以自动穿孔成圆形封套，从而能够脱离并同时组装到溶液中。由此产生的胶体微粒具有两个可独立寻址的外部雅努斯面，我们展示了它们可以作为垂直排列的两终端电子器件的颗粒内阵列发挥作用。此类颗粒表现出显著的化学和机械稳定性，并构成了能够收集和存储周围环境信息的颗粒电子器件的基础，将纳米电子学扩展到了以前无法进入的环境。
