Electroosmotic\nFlow-Driven DNA–CNT Nanomotor\nvia Tunable Surface-Charged Nanopore Array

Nanomotors are usually designed to work in liquid media\nand carry\ncargo; they exhibit excellent potential for biosensing and disease\ntreatment applications due to their small size. Graphene and carbon\nnanotubes (CNTs) are crucial components of rotary nanomotors because\nof excellent mechanical properties and adaptability to the human body.\nHerein, we introduce a DNA–CNT-based nanomotor that achieves\nits rotational control through an array of nanopores with tunable\nsurface charges. The findings demonstrate that by adjusting the surface\ncharge density of the nanopores and the direction of electric field,\na DNA strand can be sequentially captured by the nanopores, thereby\nrotating the connected CNT. The transition from a four-nanopore array\nto a six-nanopore array reveals that reducing the step angle to 60°\nsignificantly enhances the rotational stability of the nanomotor and\nreduces random fluctuations caused by Brownian motion. This method\nimproves the control stability of the nanomotor, providing robust\nsupport for future applications in nanoscale manipulation.