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Friction-induced nanofabrication method to produce protrusive nanostructures on quartz.

Song C, Li X, Yu B, Dong H, Qian L, Zhou Z - Nanoscale Res Lett (2011)

Bottom Line: The height of these nanostructures increases with the increase of the number of scratching cycles or the normal load.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Tribology Research Institute, National Traction Power Laboratory, Southwest Jiaotong University, Chengdu, Sichuan Province 610031, People's Republic of China. linmao@swjtu.edu.cn.

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.

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Related in: MedlinePlus

Selective etching of the nanolines in KOH solution. AFM images (top) and cross-sectional profiles of nanolines on quartz after etching in 20% KOH solution for various periods.
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Figure 8: Selective etching of the nanolines in KOH solution. AFM images (top) and cross-sectional profiles of nanolines on quartz after etching in 20% KOH solution for various periods.

Mentions: In order to investigate the chemical activity of the friction-induced nanostructures on quartz surface, a quartz wafer with nanolines of 3.5 nm in height was dipped in 20 wt% KOH solution at 20 ± 3°C. The AFM images in Figure 8 show the topography and cross-sectional profiles of nanolines on quartz after etching in the 20% KOH solution for various periods. Figure 9 reveals the height of the friction-induced nanolines on quartz plotted as a function of the etching time in the 20% KOH solution. With the increase in the etching time, the height of nanolines decreased quickly in the first 5 min. Finally, the nanolines were dissolved after etching in the KOH solution for 45 min. The result implies that the friction-induced nanostructures have higher chemical activity than quartz substrate in KOH solution. It can be speculated that the selective etching of the nanolines is related to the stress-induced such defects as dislocations in the microstructures. According to the distribution of the contact stress, the hillock region has been undergone higher stress and has higher density of distortion than other dislocated area [24]. The chemical reaction of the hillocks may be enhanced by these dislocations, and the hillock regions are more readily dissolved in the KOH solution than other area [31]. As a result, the hillocks can be selectively erased in KOH solution after etching for an appropriate period. This character of friction-induced nanostructures may provide a potential rewriting technology in nanoscale: friction-induced fabrication is regarded as 'writing' while selective etching is 'erasing'.


Friction-induced nanofabrication method to produce protrusive nanostructures on quartz.

Song C, Li X, Yu B, Dong H, Qian L, Zhou Z - Nanoscale Res Lett (2011)

Selective etching of the nanolines in KOH solution. AFM images (top) and cross-sectional profiles of nanolines on quartz after etching in 20% KOH solution for various periods.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211397&req=5

Figure 8: Selective etching of the nanolines in KOH solution. AFM images (top) and cross-sectional profiles of nanolines on quartz after etching in 20% KOH solution for various periods.
Mentions: In order to investigate the chemical activity of the friction-induced nanostructures on quartz surface, a quartz wafer with nanolines of 3.5 nm in height was dipped in 20 wt% KOH solution at 20 ± 3°C. The AFM images in Figure 8 show the topography and cross-sectional profiles of nanolines on quartz after etching in the 20% KOH solution for various periods. Figure 9 reveals the height of the friction-induced nanolines on quartz plotted as a function of the etching time in the 20% KOH solution. With the increase in the etching time, the height of nanolines decreased quickly in the first 5 min. Finally, the nanolines were dissolved after etching in the KOH solution for 45 min. The result implies that the friction-induced nanostructures have higher chemical activity than quartz substrate in KOH solution. It can be speculated that the selective etching of the nanolines is related to the stress-induced such defects as dislocations in the microstructures. According to the distribution of the contact stress, the hillock region has been undergone higher stress and has higher density of distortion than other dislocated area [24]. The chemical reaction of the hillocks may be enhanced by these dislocations, and the hillock regions are more readily dissolved in the KOH solution than other area [31]. As a result, the hillocks can be selectively erased in KOH solution after etching for an appropriate period. This character of friction-induced nanostructures may provide a potential rewriting technology in nanoscale: friction-induced fabrication is regarded as 'writing' while selective etching is 'erasing'.

Bottom Line: The height of these nanostructures increases with the increase of the number of scratching cycles or the normal load.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Tribology Research Institute, National Traction Power Laboratory, Southwest Jiaotong University, Chengdu, Sichuan Province 610031, People's Republic of China. linmao@swjtu.edu.cn.

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.

No MeSH data available.


Related in: MedlinePlus