高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    

SrAl2O4@SiO2核壳复合物的制备及其发光耐水解性能

付佳霖1，朱玉凤1，杨开元1，郭永梅2，卢燕3，姚同杰1   

  1. 1. 哈尔滨工业大学 化工与化学学院

    2. 闽江学院福建省新型功能性纺织纤维及材料重点实验室 3. 福州春晖制衣有限公司

  • 收稿日期:2025-07-31 修回日期:2025-09-08 网络首发:2025-09-10 发布日期:2025-09-10
  • 通讯作者: 姚同杰 E-mail:yaotj@hit.edu.cn
  • 基金资助:
    国家自然科学基金面上项目（批准号：22575069）和福州市科技重大项目（批准号：2023-ZD-006）资助

Preparation of SrAl2O4@SiO2 Core@shell Composites and Its Luminescence and Anti-hydrolysis Property

FU Jialin1，ZHU Yufeng1，YANG Kaiyuan1，GUO Yongmei2，LU Yan3，YAO Tongjie1   

  1. 1. School of Chemistry and Chemical Engineering, Harbin Institute of Technology

    2. Fujian Key Laboratory of Novel Functional Textile Fibers and Materials, Clothing and Design Faculty, Minjiang University 3. Fuzhou Chunhui Clothing-Making Co., Ltd.,

  • Received:2025-07-31 Revised:2025-09-08 Online First:2025-09-10 Published:2025-09-10
  • Supported by:
    Supported by the National Natural Science Foundation of China (NO. 22575069) and Major Science and Technology Program of Fuzhou (NO. 2023-ZD-006)

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摘要： 为解决碱土铝酸锶(SrAl2O4)易水解而导致晶体结构破坏的难题，本研究创新性地以乙二醇作为非水反应介质，采用液相沉积法对碱土铝酸锶长余辉发光粉进行SiO2层包覆。该反应在无水环境中进行，从源头上避免了包覆过程中SrAl2O4水解副反应的发生。通过系统的工艺优化研究确定了最佳包覆条件：反应溶液pH=11.0、反应温度为80.0 ℃、反应时间为2.0 h及Na2SiO3质量分数为碱土铝酸锶的6.0%。在此条件下，在碱土铝酸锶表面成功构筑了厚度为60 nm的致密SiO2包覆层。透射电子显微镜和X射线衍射等研究结果表明，SiO2包覆层结构完整均匀，且未改变碱土铝酸锶晶型结构。通过荧光光谱仪及耐水解性能测试表明，经包覆处理的碱土铝酸锶材料在发光强度仅降低9.0%的前提下，耐水性显著提升，经6.0 h水洗后仍保持良好的发光强度。热重分析结果表明，核壳复合物在800 ℃高温处理后质量保留率达93.7%。本文研究结果为长余辉发光粉改性，特别是无水环境中壳层的包覆提供了新方法，并为其在消防领域应用创造了条件。

关键词: 表面包覆方法, 发光材料, 核壳结构, 耐水性, 耐温性

Abstract: Hydrolysis in alkaline condition and inferior temperature resistance property were two disadvantages of SrAl2O4:Eu2+,Dy3+(SrAl2O4) long persistence phosphors.To address these two issues, this study has employed ethylene glycol as a non-aqueous reaction medium to cover a SiO2 layer on the SrAl2O4 surface. This strategy effectively isolated the SrAl2O4 matrix from water molecules, and hence avoiding the side hydrolysis reactions during the coating process. After careful study, the optimized coating process was determined as: solution pH value was 11.0, reaction temperature was 80.0 ℃, reaction time was 2.0 h, Na2SiO3 dosage was 6.0%(mass fractoin) of SrAl2O4 powders. Under the optimized condition, a dense SiO2 layer with the thickness of 60 nm was seamlessly coated on SrAl2O4 surface, leading to a SrAl2O4@SiO2 core@shell composite. According to X-ray diffraction pattern, the crystal phase of the SrAl2O4 was not changed during the coating process. Compared to the pristine SrAl2O4, the luminescence intensity of composites was only reduced 11.2%, while the anti-hydrolysis property was largely improved. In practical application, the bright green color could be easily observed by naked eyes after washing 6.0 h in the presence of detergent. The thermogravimetric analysis indicated the remained weight of SrAl2O4@SiO2 composites was 93.7%(mass fraction) after calcinated at 800 °C. This study provided a novel way to improve the anti-hydrolysis property and high-temperature resistance property of SrAl2O4 without remarkably sacrificing their luminescence property, and this was beneficial for their real application in fire protection.

Key words: Surface modification; Luminescent material, Core@shell structure, Anti-hydrolysis property, Thermal stability

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