Template‐Free Sol‐Gel Preparation of Superhydrophobic ORMOSIL Films for Double‐Wavelength Broadband Antireflective Coatings

Zhang, Xin‐Xiang; Cai, Shuang; You, Dan; Yan, Lianghong; Lv, Haibing; Yuan, Xiaodong; Jiang, Bo

doi:10.1002/adfm.201203059

Cited by 121 publications

(89 citation statements)

References 15 publications

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“…[ 23 ] Jiang's group adopted this method to obtain a double-layer AR coating with high transmittance at 1064 and 532 nm simultaneously. [ 24 ] But this approach had a major drawback that to guarantee the stability of the base-/acid-catalyzed mixed silica sol, the ammonia in base-catalyzed silica sol must be distilled off, which was disadvantageous to the uniformity of colloid. Besides, the well-known template method was usually used to tune the refractive index of silica coating by adjusting the addition amount of templates into silica sol.…”

Section: Introductionmentioning

confidence: 99%

In Situ Surface Assembly Derived Ultralow Refractive Index MgF₂–SiO₂ Hybrid Film for Tri‐Layer Broadband Antireflective Coating

Cui

Ding

Wang

et al. 2016

Advanced Optical Materials

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multilayers with gradient refractive index decreasing from the substrate index to that of air. [8][9][10] So the key challenge in the fabrication of broadband AR coatings lies in fi nding fi lm materials with tunable refractive index especially a low-index coating for top layer. In high power laser system, the frequency conversion process in which the fundamental beam of 1053 nm is converted to the second harmonic beam of 527 nm fi rstly, and fi nally converted to the third harmonic beam of 351 nm by two frequency conversion crystals makes many optical components subject to transmission of three wavelengths laser beams simultaneously. To reduce the energy loss, it is highly desirable to develop AR coatings exhibiting high transmittance simultaneously at 351, 527, and 1053 nm. [ 11 ] This broadband AR coating working in several specifi c wavelengths faces greater challenges compared to the common broadband AR coating because the peak position must be tailored in specifi c wavelengths by precisely controlling the refractive index and fi lm thickness of each layer. Any slight deviation of refractive index or fi lm thickness will lead to the shift of peak position and thus fail in reaching the required optical performance. For all above diffi culties, many approaches cannot already meet the requirement such as reactive ion etching process [ 12,13 ] and the heteroepitaxial growth of nanorods because of the complex process, incapable precise control of refractive index and fi lm thickness, high cost of these techniques, and non-availability in a large area substrate. [ 14 ] Fortunately, sol-gel process provides a preferable choice due to the great advantage on precise control of refractive index by tailoring the sol microstructure and chemical composition, excellent adhesion to glass surface, low process temperature, and good homogeneity. [15][16][17][18] The sol-gel derived silica and magnesium fl uoride coatings, characterized by low refractive index of 1.45 and 1.38 respectively, low dispersion in UV region, and good stability, have become the best choice of fi lm materials in high power laser systems. [19][20][21][22] There have been many reports devoted to tune the refractive index of silica coating based on the acid-catalyzed and base-catalyzed procedure. For instance, Thomas prepared

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Section: Introductionmentioning

confidence: 99%

In Situ Surface Assembly Derived Ultralow Refractive Index MgF₂–SiO₂ Hybrid Film for Tri‐Layer Broadband Antireflective Coating

Cui

Ding

Wang

et al. 2016

Advanced Optical Materials

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“…Nowadays, antireflection is necessary in daily life. Thus, based on these perceptions, an extensive number of micro-nanostructured surfaces have been fabricated [115][116][117][118][119]. Combining transparency and flexibility, Tsui et al [65] fabricated a PDMS nanocone film for photovoltaic solar cell applications.…”

Section: Applications Of Transparent and Flexible Superamphiphobic Sumentioning

confidence: 99%

Chemical and Physical Pathways for Fabricating Flexible Superamphiphobic Surfaces with High Transparency

et al. 2018

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Since the discovery of the self-cleaning properties of the lotus effect, the wetting of surfaces were intensively investigated due to their potential application in many industrial sectors. The transparency of flexible liquid repellent coatings are a major industrial problem and their economic consequences are widely known. Hence, a comprehensive understanding of the developments of flexible and transparent superamphiphobic surfaces is required in a number of technological and industrial situations. In this review, we aim to discuss the progress in the design, synthesis, fabrication techniques, and applications of flexible and transparent superamphiphobic surfaces. We start with an introduction, exploring the contact angles and wetting states for superhydrophilic, superhydrophobic, and superoleophobic surfaces, and continue with a review of the wetting transition of such surfaces. Then, we highlight the fabrication techniques involved for the preparation of flexible and transparent superamphiphobic surfaces. This review also discusses the key issues in the fabrication process and surfaces, and their features in improving durability characteristics and self-repellent performance. Then we suggest various recommendations for the improvement of mechanical durability along with potential future directions towards more systematic methods that will also be acceptable for industry. Finally, we conclude with some challenges and potential applications.

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“…Compared to the complex fabrication processes of aforementioned bionic broadband AR thin lms or graded-refractive-index lms, however, this method is simpler. As to double-layer interference lms, [18][19][20] the refractive index of the top-layer needs to be sufficient low, thus lm material is always limited to the one with low refractive index, such as SiO 2 . In contrast, triple-layer interference lms with quarter-halfquarter wavelength in optical thickness (i.e.…”

Section: -5mentioning

confidence: 99%

Preparation of mechanically stable triple-layer interference broadband antireflective coatings with self-cleaning property by sol–gel technique

Yang

Xia

et al. 2017

RSC Adv.

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Antireflective coatings usually suffer from poor functional durability during outdoor service. The incorporation of additional properties, such as broadband antireflection, self-cleaning and mechanical stability, is of great importance. In the current work, we synthesized broadband AR coatings via the design concept of triple-layer interference coating. SiO 2 -TiO 2 , TiO 2 and nanoporous TiO 2 -SiO 2 composite thin films were employed as bottom, middle and top layers. Substrates (BK-7 glass) coated with the triple-layer films attained consistent high transmittances at 500-700 nm and the average transmittance at that region was 99.4%. The triple-layer films exhibited an outstanding superhydrophilic property with water contact angle of 2 in 0.5 s, and the superhydrophilicity could last for 30 days in the absence of UV illumination. These triple-layer coatings also showed a good ability to decompose organic substances under UV irradiation. The synergistic effect between superhydrophilicity and photocatalysis provides the films with self-cleaning effect. Meanwhile, the abrasion resistance test of the triple-layer films indicated favorable robustness and good adhesion of the films to substrates. This multifunctional film can have potential applications in various areas, like solar cell panels, green houses and architectural glasses.

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Template‐Free Sol‐Gel Preparation of Superhydrophobic ORMOSIL Films for Double‐Wavelength Broadband Antireflective Coatings

Abstract: Figure 3 . Transmittance spectra of a single-layer quarterwave AR coating and an experimental and modeled double-wavelength AR coating.

Cited by 121 publications

References 15 publications

In Situ Surface Assembly Derived Ultralow Refractive Index MgF₂–SiO₂ Hybrid Film for Tri‐Layer Broadband Antireflective Coating

In Situ Surface Assembly Derived Ultralow Refractive Index MgF₂–SiO₂ Hybrid Film for Tri‐Layer Broadband Antireflective Coating

Chemical and Physical Pathways for Fabricating Flexible Superamphiphobic Surfaces with High Transparency

Preparation of mechanically stable triple-layer interference broadband antireflective coatings with self-cleaning property by sol–gel technique

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Template‐Free Sol‐Gel Preparation of Superhydrophobic ORMOSIL Films for Double‐Wavelength Broadband Antireflective Coatings

Abstract: Figure 3 . Transmittance spectra of a single-layer quarterwave AR coating and an experimental and modeled double-wavelength AR coating.

Cited by 121 publications

References 15 publications

In Situ Surface Assembly Derived Ultralow Refractive Index MgF2–SiO2 Hybrid Film for Tri‐Layer Broadband Antireflective Coating

In Situ Surface Assembly Derived Ultralow Refractive Index MgF2–SiO2 Hybrid Film for Tri‐Layer Broadband Antireflective Coating

Chemical and Physical Pathways for Fabricating Flexible Superamphiphobic Surfaces with High Transparency

Preparation of mechanically stable triple-layer interference broadband antireflective coatings with self-cleaning property by sol–gel technique

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In Situ Surface Assembly Derived Ultralow Refractive Index MgF₂–SiO₂ Hybrid Film for Tri‐Layer Broadband Antireflective Coating

In Situ Surface Assembly Derived Ultralow Refractive Index MgF₂–SiO₂ Hybrid Film for Tri‐Layer Broadband Antireflective Coating