Alam Md Shah, Zhan Qiwen, Zhao Chenglong
Nano Lett. 2020 Jul 8;20(7):5057-5064. doi: 10.1021/acs.nanolett.0c01261. Epub 2020 Jun 11.
We demonstrate an opto-thermomechanical (OTM) nanoprinting method that allows us not only to additively print nanostructures with sub-100 nm accuracy but also to correct printing errors for nanorepairing under ambient conditions. Different from other existing nanoprinting methods, this method works when a nanoparticle on the surface of a soft substrate is illuminated by a continuous-wave (cw) laser beam in a gaseous environment. The laser heats the nanoparticle and induces a rapid thermal expansion of the soft substrate. This thermal expansion can either release a nanoparticle from the soft surface for nanorepairing or transfer it additively to another surface in the presence of optical forces for nanoprinting with sub-100 nm accuracy. Details of the printing mechanism and parameters that affect the printing accuracy are investigated. This additive OTM nanoprinting technique paves the way for rapid and affordable additive manufacturing or 3D printing at the nanoscale under ambient conditions.
我们展示了一种光热机械（OTM）纳米打印方法，该方法不仅使我们能够以低于100纳米的精度进行纳米结构的增材打印，还能在环境条件下校正打印错误以进行纳米修复。与其他现有的纳米打印方法不同，当软基板表面的纳米颗粒在气态环境中被连续波（cw）激光束照射时，此方法即可发挥作用。激光加热纳米颗粒并引起软基板的快速热膨胀。这种热膨胀既可以使纳米颗粒从软表面释放以进行纳米修复，也可以在存在光力的情况下将其增材转移到另一个表面，从而实现精度低于100纳米的纳米打印。我们研究了打印机制的细节以及影响打印精度的参数。这种增材OTM纳米打印技术为在环境条件下进行纳米级的快速且经济实惠的增材制造或3D打印铺平了道路。
