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摘要
动态荧光切换材料广泛应用于信息加密领域。为了实现纳米粒子的多重荧光特性,首先制备了共价连接四苯乙烯的SiO2纳米粒子(TPE-SiO2),通过表面改性和接枝,将光致变色分子螺吡喃修饰在TPE-SiO2表面,得到具有双重荧光特性的SiO2纳米粒子(TPE-SiO2-SP)。结果表明:TPE-SiO2的激发波长在320nm,发射波长在480nm左右,荧光强度随着其粒径的减小而明显增强;对TPE-SiO2-SP进行紫外光照射后,TPE-SiO2-SP表面的螺吡喃从无荧光的螺吡喃结构(SP)形式转换为有荧光的部花菁结构(MC)形式,发出明亮的红色荧光;在反应体系中加入H+离子后,螺吡喃分子转化为无荧光的质子化部花菁结构(MCH+)形式,TPE-SiO2-SP又显现出淡蓝色荧光。这种具有荧光切换能力的纳米粒子有望应用于信息加密平台的构建。
Abstract
Dynamic fluorescent switching materials are widely used in information encryption field.In order to realize the multiple fluorescence properties of nanoparticles,firstly,SiO2 nanoparticles covalently linked with tetraphenylethene (TPE-SiO2) were prepared.Subsequently,photochromic spiropyran molecules were decorated on the surface of TPE-SiO2 by surface modification and grafting technique to obtain SiO2 nanoparticles with double fluorescence characteristics (TPE-SiO2-SP).The results showed that the excitation wavelength of TPE-SiO2 was 320nm,its emission wavelength was around 480 nm,and the fluorescence intensity increased with the decrease of the particle size.After ultraviolet irradiation,the spiropyran on the surface of TPE-SiO2-SP changed from non-fluorescent SP form to fluorescent MC form,emitting bright red fluorescence.When H+ ions were added to the reaction system,the spiropyran molecules transformed into non-fluorescent protonated MCH+ form,and TPE-SiO2-SP exhibited light blue fluorescence again.These nanoparticles with fluorescence switching ability are expected to be used in the construction of information encryption platforms.
关键词
二氧化硅
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纳米粒子
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四苯乙烯
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螺吡喃
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荧光切换
Key words
SiO2
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nanoparticles
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tetraphenylethene
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spiropyran
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fluorescence switching
具有双重荧光切换能力的SiO2纳米粒子的制备及性能研究[J].
化工新型材料, 2024, 52(6): 117-121 DOI:10.19817/j.cnki.issn1006-3536.2024.06.009
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基金资助
国家自然科学基金面上项目(21671081)
