title: Friction-induced nanofabrication method to produce protrusive nanostructures on quartz.
abstract: In this paper, a new friction-induced nanofabrication method is presented to fabricate protrusive nanostructures on quartz surfaces through scratching a diamond tip under given normal loads. The nanostructures, such as nanodots, nanolines, surface mesas and nanowords, can be produced on the target surface by programming the tip traces according to the demanded patterns. The height of these nanostructures increases with the increase of the number of scratching cycles or the normal load. Transmission electron microscope observations indicated that the lattice distortion and dislocations induced by the mechanical interaction may have played a dominating role in the formation of the protrusive nanostructures on quartz surfaces. Further analysis reveals that during scratching, a contact pressure ranged from 0.4Py to Py (Py is the critical yield pressure of quartz) is apt to produce protuberant nanostructures on quartz under the given experimental conditions. Finally, it is of great interest to find that the protrusive nanostructures can be selectively dissolved in 20% KOH solution. Since the nanowords can be easily 'written' by friction-induced fabrication and 'erased' through selective etching on a quartz surface, this friction-induced method opens up new opportunities for future nanofabrication.
authors.affiliation: Tribology Research Institute, National Traction Power Laboratory, Southwest Jiaotong University, Chengdu, Sichuan Province 610031, People's Republic of China. linmao@swjtu.edu.cn.
authors.forename: Chenfei
authors.initials: C
authors.lastname: Song
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Li
authors.forename: Bingjun
authors.initials: B
authors.lastname: Yu
authors.forename: Hanshan
authors.initials: H
authors.lastname: Dong
authors.forename: Linmao
authors.initials: L
authors.lastname: Qian
authors.forename: Zhongrong
authors.initials: Z
authors.lastname: Zhou