Self-Cleaning Poly(dimethylsiloxane) Film with Functional Micro/Nano Hierarchical Structures

Zhang, Xiaosheng; Zhu, Fu-Yun; Han, Mengdi; Sun, Xuming; Peng, Xuhua; Zhang, Haixia

doi:10.1021/la4023745

Cited by 50 publications

(29 citation statements)

References 39 publications

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“…Furthermore, because the PET film, PVDF film, electrode, and PDMS film are hydrophobic, the self‐powered sensor is able to continue working properly after experiencing a moist environment. The stability of the self‐powered sensor after exposure to extreme moisture conditions was tested (Figure S6, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Highly Reliable Real‐time Self‐powered Vibration Sensor Based on a Piezoelectric Nanogenerator

et al. 2018

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With the diverse development in electronic devices, high cost, low reliability, and the need for battery power have been severe obstacles to restrict the wide application of sensors. In this work, we present a highly reliable, real‐time, self‐powered vibration sensor based on an enhanced piezoelectric nanogenerator (NG), which is heat resistant, waterproof, relatively low cost, and with a long lifetime. The enhanced piezoelectric NG is constructed into a double‐arched structure: the upper arched layer is the poly(vinylidene fluoride) (PVDF) film with designed optimum size, which can utilize the excellent piezoelectric potential of the d31 mode; the lower arched layer is the polydimethylsiloxane (PDMS) film covered by uniform trapezoidal microstructures and thereby increases the charge density of the piezoelectric NG. The piezoelectric NG output voltage with the double‐arched structure increased by 35.1 % upon applying a mechanical force of 5 N. Relating to improved steady voltage output performance, the enhanced piezoelectric NG was used as the sensitive element of a sensor with sensitivity of 2.21 V g−1 and linearity error of 5.91 % under a vibration amplitude of 6 mm. Moreover, the sensor not only exhibited stable repeatability and stability over long times, but it also steadily produced output performances after soaking in water temperatures up to 70 °C. Therefore, the highly reliable self‐powered vibration sensor presents prominent prospect for future application.

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Section: Resultsmentioning

confidence: 99%

Highly Reliable Real‐time Self‐powered Vibration Sensor Based on a Piezoelectric Nanogenerator

et al. 2018

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“…Superhydrophobic surfaces with a water contact angle (CA) higher than 150° and a sliding angle (SA) lower than 10°, which exist in nature (e.g., lotus leaves and butterfly wings), have a wide application in self‐cleaning, water‐proofing, anti‐icing, and anticorrosion . The water repellency of such surfaces often depends on low‐surface‐energy components and proper roughness created by micro and nanoscale structures .…”

Section: Introductionmentioning

confidence: 99%

“…In the past decades, great efforts have been made to construct various elaborate roughness by bionic methods for the fabrication of superhydrophobic surfaces . However, these surface structures are usually fragile and are easily damaged by mechanical loads (e.g., abrasion and water washing) and consequently lose their superhydrophobic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Highly Stretchable Superhydrophobic Composite Coating Based on Self‐Adaptive Deformation of Hierarchical Structures

Tang

et al. 2017

Small

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With the rapid development of stretchable electronics, functional textiles, and flexible sensors, water-proof protection materials are required to be built on various highly flexible substrates. However, maintaining the antiwetting of superhydrophobic surface under stretching is still a big challenge since the hierarchical structures at hybridized micro-nanoscales are easily damaged following large deformation of the substrates. This study reports a highly stretchable and mechanically stable superhydrophobic surface prepared by a facile spray coating of carbon black/polybutadiene elastomeric composite on a rubber substrate followed by thermal curing. The resulting composite coating can maintain its superhydrophobic property (water contact angle ≈170° and sliding angle <4°) at an extremely large stretching strain of up to 1000% and can withstand 1000 stretching-releasing cycles without losing its superhydrophobic property. Furthermore, the experimental observation and modeling analysis reveal that the stable superhydrophobic properties of the composite coating are attributed to the unique self-adaptive deformation ability of 3D hierarchical roughness of the composite coating, which delays the Cassie-Wenzel transition of surface wetting. In addition, it is first observed that the damaged coating can automatically recover its superhydrophobicity via a simple stretching treatment without incorporating additional hydrophobic materials.

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“…All of these drawbacks limit the practical application of this method in specific occasions that require high transparency and other materials. Alternatively, replica molding (REM) is an efficient and simple method for the duplication of the information (that is, shape, morphology, and structure) present in the surface of a mold 23,24 . The wrinkle-fabrication process can be further simplified and the cost can be reduced by using a fabricated wrinkle mold to duplicate a wrinkle pattern via REM.…”

Section: Introductionmentioning

confidence: 99%

Controlled fabrication of nanoscale wrinkle structure by fluorocarbon plasma for highly transparent triboelectric nanogenerator

Cheng

Miao

et al. 2017

Microsyst Nanoeng

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In this paper, we report a novel nanoscale wrinkle-structure fabrication process using fluorocarbon plasma on poly (dimethylsiloxane) (PDMS) and Solaris membranes. Wrinkles with wavelengths of hundreds of nanometers were obtained on these two materials, showing that the fabrication process was universally applicable. By varying the plasma-treating time, the wavelength of the wrinkle structure could be controlled. Highly transparent membranes with wrinkle patterns were obtained when the plasmatreating time was o 125 s. The transmittances of these membranes were 490% in the visible region, making it difficult to distinguish them from a flat membrane. The deposited fluorocarbon polymer also dramatically reduced the surface energy, which allowed us to replicate the wrinkle pattern with high precision onto other membranes without any surfactant coating. The combined advantages of high electron affinity and high transparency enabled the fabricated membrane to improve the performance of a triboelectric nanogenerator. This nanoscale, single-step, and universal wrinkle-pattern fabrication process, with the functionality of high transparency and ultra-low surface energy, shows an attractive potential for future applications in microand nanodevices, especially in transparent energy harvesters. INTRODUCTIONPatterned surface structures on the nano-or micrometer scale have a significant role in the properties of a material, including physical, mechanical, electrical, and optical 1 . The fabrication process for these patterns has been traditionally realized by photolithography, printing processes, embossing, or writing techniques, of which the relatively high cost and low throughput limit their application for producing complex topologies over large areas. Thereby, selfassembled patterns for large-area patterning, which generally employ physical-chemical or mechanical instabilities within a constrained system to form highly ordered structures, have attracted great attention for many years 2-7 . Among these methods, mechanically inducing a wrinkle structure on a bilayer system is especially suited to creating highly ordered microstructures across a large surface and features convenient fabrication and a tunable wavelength by adjusting the thickness of the stiff layer and the prestrain [8][9][10][11][12] . As a result, wrinkle structures have been used in various applications, such as smart adhesion, liquid/cell shaping, particle assembly, optical surfaces, flexible electronic devices, and energy harvesters [13][14][15][16][17][18][19][20] . To date, most studies involving wrinkling to create ordered structures rely on plasma or ultraviolet-ozonolysis (UVO) oxidation and metal deposition to create the stiff skin. Although these approaches are quite practical, the material properties of the substrate during oxidation can significantly alter the typical morphologies and even block the formation of the wrinkle structure (that is, the process does not have universality to different materials), whereas the deposition of the metal la...

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Self-Cleaning Poly(dimethylsiloxane) Film with Functional Micro/Nano Hierarchical Structures

Cited by 50 publications

References 39 publications

Highly Reliable Real‐time Self‐powered Vibration Sensor Based on a Piezoelectric Nanogenerator

Highly Reliable Real‐time Self‐powered Vibration Sensor Based on a Piezoelectric Nanogenerator

Highly Stretchable Superhydrophobic Composite Coating Based on Self‐Adaptive Deformation of Hierarchical Structures

Controlled fabrication of nanoscale wrinkle structure by fluorocarbon plasma for highly transparent triboelectric nanogenerator

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