| HU Wei,YIN Yongming,HAO Xia,MENG Hong.Preparation of Antireflective Glass-ceramic Based on Biomimetic Moth Eye Structure[J],53(18):183-191 |
| Preparation of Antireflective Glass-ceramic Based on Biomimetic Moth Eye Structure |
| Received:September 21, 2023 Revised:February 23, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.18.016 |
| KeyWord:glass-ceramic wet etching moth eye structure grain size transmittance crystallization process |
| Author | Institution |
| HU Wei |
School of Advanced Materials, Peking University Shenzhen Graduate School, Guangdong Shenzhen , China |
| YIN Yongming |
Shenzhen MSU-BIT University, Guangdong Shenzhen , China |
| HAO Xia |
Hainan Holdings Special Glass Technology Co., Ltd., Hainan Chengmai , China |
| MENG Hong |
School of Advanced Materials, Peking University Shenzhen Graduate School, Guangdong Shenzhen , China |
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| Abstract: |
| The high transparency and low reflection performance of the moth eye structure is of great significance for industries such as photovoltaic and display screens. The work aims to develop a simple and rapid method for preparing moth eye glass based on glass-ceramic (GC). Antireflective GC was prepared by wet etching, and the effect of crystallization time on transmittance, reflectance, and morphology were analyzed. Basic glass was prepared by melting method, and a series of GCs with different grain sizes (12.2-27.4 nm) were prepared by adjusting the crystallization time. As the crystallization process time increased, the crystal size in GC also increased. When the crystallization time was 180 min, the average crystal size reached 27.4 nm. Continuing to increase the time might lead to excessive crystallization and cause glass opacity. The prepared basic glass and GCs with different grain sizes were placed in a prepared etching solution of 5wt.% HF, 2wt.% SiO2, 1.5wt.% BaSO4, 2wt.% carboxymethyl cellulose sodium, and 89.5wt.% H2O. The etching was carried out on both sides at 40 kHz ultrasonic frequency for 60 min at 25 ℃. The transmittance and reflectance of the sample before and after etching were measured by spectrophotometer, and the surface and cross-sectional morphology of the sample before and after etching were characterized by scanning electron microscope. After nucleating the basic glass at 500 ℃ for 230 min and crystallizing at 665 ℃ for 135 min, the grain size of the GC prepared was about 25.1 nm. After further wet etching, the etching depth was about 150 nm, and the highest transmittance of the moth eye glass was 98.02%. The lowest reflectance was 1.82%. The sum of the transmittance, reflectance, and absorption of glass was 100%, and the absorption of glass was considered constant. As the transmittance increased, the reflectance decreased. The results showed that after wet etching, the GC formed a moth eye structure on the glass surface, greatly improving the glass transmittance and reducing its reflectance. After wet etching, the antireflective effect of GC was significant. Analysis of the test results of X-ray diffraction (XRD), grazing incidence X-ray diffraction (GIXRD), and scanning electron microscopy (SEM) showed that there were crystal phases and residual glass phases in GC. After acid etching treatment, a moth eye structure with uniformly distributed petalite and lithium disilicate crystals could be formed on the surface. The transmittance of GC with a crystal size distribution of 12.2-27.4 nm after wet etching ranged from 95.99% to 98.02%. As the crystallization time increased, the crystal size of the microcrystalline phase in the GC gradually increased, the crystal phase content gradually increased, and the glass phase content gradually decreased. Under the same etching conditions, the longer the crystallization time of the GC substrate, the deeper it was etched, resulting in an increase in the thickness of the final moth eye structure film layer. The antireflective surface modification of transparent materials has always attracted much attention, and the research on the structure of surface facial mask based on different methods has been ongoing. There is a theoretical threshold for the transmittance of each material, so in the absence of significant differences in the performance of various methods in enhancing transparency, future research directions will focus on large-scale, low-cost, and easy processing. |
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