Hydrophobic to superhydrophobic and hydrophilic transitions of Ar plasma-nanostructured PTFE surfaces

被引：12

作者：

Pachchigar, Vivek ^{[1
,2
]}

Gaur, Umesh K. ^{[1
]}

Amrutha, T., V ^{[3
]}

Sooraj, K. P. ^{[1
]}

Hans, Sukriti ^{[2
]}

Srivastava, Sanjeev K. ^{[4
]}

Ranjan, Mukesh ^{[1
,2
]}

机构：

[1] Inst Plasma Res, Plasma Surface Engn Div, Gandhinagar, Gujarat, India

[2] Homi Bhabha Natl Inst, Mumbai, Maharashtra, India

[3] Kadi Sarva Vishvavidyalaya, Dept Phys, Gandhinagar, Gujarat, India

[4] Indian Inst Technol Kharagpur, Dept Phys, Kharagpur, W Bengal, India

来源：

PLASMA PROCESSES AND POLYMERS | 2022年 / 19卷 / 09期

关键词：

Ar plasma; plasma etching; PTFE; RF discharge; superhydrophobic surfaces; CROSS-LINKING; POLYTETRAFLUOROETHYLENE PTFE; POLYMERS; ADHESION; ARGON; FILMS; AIR; PROTRUSIONS; PERFORMANCE; SPECTRA;

D O I：

10.1002/ppap.202200037

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Production of superhydrophobic polytetrafluoroethylene (PTFE) by Ar plasma etching is challenging as it leads to defluorination, resulting in a hydrophilic surface. The effect of radiofrequency power, treatment time, impurity, and surface temperature on Ar plasma-treated PTFE was investigated for producing a large-area superhydrophobic PTFE surface. To avoid impurity and substrate temperature effects, a single electrode-based arrangement with a sacrificial PTFE disc behind the specimen was used for plasma discharge. After 5 min treatment at 100 W, the surface became superhydrophobic (water contact angle = 156 degrees) due to the formation of isotropic nanostructures. However, 30 min of plasma treatment caused severe chemical changes resulting in a hydrophilic surface (water contact angle = 14 degrees). A yellowish layer was formed on the surface due to crosslinking, redeposition of fluorocarbon species, and iron impurities from the plasma system confirmed by X-ray photoelectron spectroscopy analysis.

引用

页数：14