Pulsed Laser Induced Triple Layer Copper Oxide Structure for Durable Polyfunctionality of Superhydrophobic Coatings

Abstract

anions such as chloride ions. [1,2,[4][5][6][7] This can compromise using bare copper and its alloys in technology because corrosion of copper impacts its performance in industrial and technological applications.Several ways for enhancing the corrosion protection were discussed in the literature, including the formation of thick oxide films [3,8,9] and the formation of a superhydrophobic layer atop of bulk copper. [10][11][12][13][14][15][16][17][18][19] As for oxide films on copper and copper alloys, typically the ionic state of copper can be either monovalent or divalent, associated with the formation of cuprous oxide Cu 2 O or cupric oxide CuO, respectively. In many cases, such as high temperature or anodic oxidation, the dual oxide phase formation takes place, with CuO occupying the outer and Cu 2 O the inner layers. [8,9,20,21] Such complex oxide layer has been found to be useful in improving the corrosion resistance of copper in NaCl solutions, [1,2,8,22] while the formation of a compact thick film of CuO on Cu surface prevents anodic corrosion. [23] The superhydrophobic films on metal surfaces essentially inhibit the electrochemical corrosion processes due to several protection mechanisms, such as electrolyte repellency, suppression of adsorption of aggressive ions onto the surface, barrier effect of the modified textured surface layer, and specific charging of a hydrophobic surface in electrolytes. [24,25] At the same time, for the majority of designed superhydrophobic coatings, a poor abrasive resistance restricts the practical application of these coatings. However, it was shown recently [26] that a strategy, combining the laser chemical modification of metal's surface layer and laser texturing, followed by chemisorption of low energy compounds, can be effectively used to control the mechanical and chemical properties of a superhydrophobic layer on aluminum substrate.In this study, we will demonstrate that the coatings with enhanced protective properties based on multibarrier principle can be designed on copper using the above strategy. We will show that nanosecond laser treatment in an oxygen atmosphere under appropriate laser texturing regimes followed by chemisorption of fluorooxysilane allows obtaining a thick layer of cupric oxide CuO with crystalline micro-and nanotexture and superhydrophobic properties. Triple layer copper oxide structure designed in that way allows solving the problem of durable polyfunctionality of superhydrophobic coatings. We will present Copper and its alloys are among the most used metals for the industry. However, using bare copper and its alloys in technology is compromised because corrosion and poor abrasion resistance of copper impacts its performance in industrial and technological applications. In this paper, a strategy based on combining the laser chemical modification of metal's surface in a controlled atmosphere and laser texturing, followed by chemisorption of low energy compounds is effectively used for fabrication of a superhydrophobic coating with enhanced prot...

Retracted Article: Facile preparation of bithiazole-based material for inkjet printed light-emitting electrochemical cell

“…Meanwhile, the current density began to decrease, possibly due to the electrochemical oxidation or electro corrosion that occurred on component 1c through accumulated electroinduced holes, and then it kept up a durative datum. 58 Apparently it exhibited outstanding long-term operation stability beyond 40 h (Fig. 5b).…”

Increasing Antibacterial Efficiency of Cu Surfaces by targeted Surface Functionalization via Ultrashort Pulsed Direct Laser Interference Patterning

“…Here, soaking of the deposited liquid into the porous surface structure forces the bacteria against the hierarchically scaled surface features resulting in structural cell membrane damage, [38][39][40] similar to the killing mechanism of bacteria piercing surface topographies on Cicada or Dragonfly wings. [32,33] Unfortunately, antibacterial efficiency decreases strongly as soon as the surfaces stabilize at hydrophobic wetting, [38,41] which is most likely linked to the dense superficial layer of CuO initiated during short pulsed laser processing [42] showing reduced antimicrobial capacities due to reduced Cu ion release. [14] Therefore, it is important to include all functional aspects of their antiseptic effectiveness when specifically optimizing antimicrobial copper surfaces in order to maintain the positive effects over a longer period of time.…”

Thermally Induced Gradient of Properties on a Superhydrophobic Magnesium Alloy Surface

“…Laser technology allows easily achieving the extreme water repellence for the diversity of materials. Besides, it was also shown that a combination of laser chemical modification and laser texturing followed by chemisorption of low surface energy compounds allows getting the superhydrophobic coatings with exceptional mechanical and chemical properties on top of different substrates [17][18][19][20]. Thus, providing breakthrough results in Metals 2021, 11, 41 2 of 14 materials science [21][22][23][24][25][26][27][28], laser processing of materials has proven to be a quite simple and attractive method for surface modification.…”