Damage regularity and multifractal analysis of sol-gel reflection coating of KDP crystal under low UV irradiation flux.

IF 2 3区 工程技术 Q2 ANATOMY & MORPHOLOGY
Tenghui You, Yanmeng Dai, Jian Yu, Hai-Xian Ye, Wan-Jun Dai, Lei-Feng Cao
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Abstract

This study employed multifractal analysis to investigate the changes in surface morphology of SiO2 anti-reflective coatings prepared on KDP substrates using the sol-gel method, under various conditions of ultraviolet (UV) irradiance. The coatings were successfully fabricated, and the chemical structure of the SiO2 sol was comprehensively characterized using Solid-State Nuclear Magnetic Resonance (SSNMR) technology. Under low UV irradiance (4 J/cm2), repeated experiments revealed a crack-induced mechanism of surface fatigue damage. Utilizing Scanning Electron Microscopy (SEM), the study discovered the induction effect of initial crack defects in UV-damaged coatings and established a damage model. Furthermore, Atomic Force Microscopy (AFM) was used to acquire images of the coatings' surface morphology at different damage levels, which were analyzed using the multifractal spectrum f(α). This analysis confirmed the multifractal nature of the coatings both before and after damage. This study identified significant effects of UV irradiation on the width of the multifractal spectrum and Δf, indicating that the SiO2 anti-reflective coatings exhibit multifractal characteristics under various damage states. The coatings displayed a pattern of decreasing and then increasing singularity spectrum width, height distribution unevenness, and surface roughness with increasing damage. This study demonstrates that multifractal analysis is an effective tool for describing the complexity of the surface morphology of sol-gel-derived anti-reflective coatings for the first time and for validating their multifractal properties across different stages of UV damage. HIGHLIGHTS: Damage dynamic process of KDP crystal sol-gel coating was described by SEM&AFM; The crack propagation mechanism of sol-gel coating under UV radiation is proposed; The damage evolution of sol-gel coating was described by multifractal analysis.

低紫外辐照通量下 KDP 晶体溶胶凝胶反射涂层的损伤规则性和多分形分析
本研究采用多分形分析法研究了在不同紫外线(UV)辐照条件下,利用溶胶-凝胶法在 KDP 基材上制备的 SiO2 防反射涂层的表面形貌变化。成功制备了涂层,并利用固态核磁共振(SSNMR)技术对 SiO2 溶胶的化学结构进行了全面表征。在低紫外辐照度(4 J/cm2)条件下,重复实验揭示了裂纹诱导的表面疲劳损伤机制。研究利用扫描电子显微镜(SEM)发现了紫外线损伤涂层中初始裂纹缺陷的诱导效应,并建立了损伤模型。此外,研究还利用原子力显微镜(AFM)获取了不同损伤程度下涂层表面形态的图像,并利用多分形光谱 f(α) 对其进行了分析。该分析证实了涂层在受损前后的多分形性质。研究发现紫外线照射对多分形光谱宽度和 Δf 有明显影响,这表明二氧化硅减反射涂层在各种损伤状态下都表现出多分形特性。涂层的奇异谱宽度、高度分布不均匀度和表面粗糙度随着损伤程度的增加呈现先减小后增大的模式。这项研究首次证明了多分形分析是描述溶胶-凝胶衍生减反射涂层表面形态复杂性的有效工具,也是验证其在不同紫外线损伤阶段的多分形特性的有效工具。亮点:利用SEM&AFM描述了KDP晶体溶胶凝胶涂层的损伤动态过程;提出了紫外辐射下溶胶凝胶涂层的裂纹扩展机理;利用多分形分析描述了溶胶凝胶涂层的损伤演变过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Microscopy Research and Technique
Microscopy Research and Technique 医学-解剖学与形态学
CiteScore
5.30
自引率
20.00%
发文量
233
审稿时长
4.7 months
期刊介绍: Microscopy Research and Technique (MRT) publishes articles on all aspects of advanced microscopy original architecture and methodologies with applications in the biological, clinical, chemical, and materials sciences. Original basic and applied research as well as technical papers dealing with the various subsets of microscopy are encouraged. MRT is the right form for those developing new microscopy methods or using the microscope to answer key questions in basic and applied research.
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