磺酸基与羧基修饰纳米二氧化硅:两种阴离子型纳米指纹显现材料的制备与应用  

Synthesis of the Carboxylic and Sulfonic SiO_(2) and Its Application to Latent Fingermark Development

作　　者：陈煜太 黄威[3] 姜红[2] 李珊 王元凤 CHEN Yutai;HUANG Wei;JIANG Hong;LI Shan;WANG Yuanfeng(Key Laboratory of Evidence Science,China University of Political Science and Law,Beijing 100080,China;People's Public Security University of China,Beijing 100038,China;Institute of Forensic Science,Ministry of Public Security,Beijing 100038,China)

机构地区：[1]中国政法大学证据科学教育部重点实验室,北京100080 [2]中国人民公安大学侦查学院,北京100038 [3]公安部物证鉴定中心,北京100038

出　　处：《材料导报》2022年第5期1-7,共7页Materials Reports

基　　金：国家重点研发计划项目(2018YFC0807304);国家自然科学基金项目(61108075);中国政法大学校级科学研究规划项目(20116040)。

摘　　要：通过反相微乳液法制备包埋[Ru(bpy)_(3)]^(2+)的纳米SiO_(2),赋予指纹显现试剂高效光致发光性能和绿色环保优势;尝试使用氨基前驱体和氨解反应两步法,制得羧基表面修饰的纳米SiO_(2);通过巯基前驱体和氧化反应两步法,制得磺酸基表面修饰的纳米SiO_(2),并综合比较了羧基修饰和磺酸基修饰两种表面修饰路径的效果。实验结果表明,染料和包埋产物的紫外可见区吸收峰值分别在452.43 nm和476.06 nm,羧基修饰和磺酸基修饰纳米SiO_(2)的平均粒径约为40 nm,DLS粒径分别为122.4 nm和110.1 nm,Zeta电位分布峰值分别为-33.16 mV和-34.99 mV,两种体系对于悬浮液酸碱度的敏感程度存在差异,正交试验考察两种材料显现潜在指纹的最佳条件分别为稀释比例1∶3、pH值2.9、浸显时间5 min,稀释比例1∶5、pH值3.5、浸显时间5 min。此复合材料具有良好的显现效率和安全性。Silica nanoparticles embedded with[Ru(bpy)_(3)]^(2+) were synthesized by inverse microemulsion method,which endowed the fingerprint developing reagent with excellent photoluminescence and high safety.Carboxyl modified silica nanoparticles were prepared by a two-step method using amino precursor and ammonolysis reaction.Sulfonic acid modified silica nanoparticles were prepared by a two-step method using sulfhydryl precursor and oxidation reaction.The two types of negatively charged silica nanoparticles were compared comprehensively.It indicated that the absorption peaks of[Ru(bpy)_(3)]^(2+) and dye-doped nanoparticles in UV-Vis region were 452.43 nm and 476.06 nm,respectively.The average particle sizes of carboxyl and sulfonic acid modified silica nanoparticles were approximately 40 nm,and the DLS particle sizes were 122.4 nm and 110.1 nm,respectively.The peak values of Zeta potential distribution were-33.16 mV and-34.99 mV,respectively.When dispersed into the solution,carboxyl and sulfonic acid modified silica nanoparticles presented different sensitivities to the pH value of suspension.The optimized conditions for latent fingerprint development by the two negatively charged nanoparticles were achieved through orthogonal design experiment,which included dilution ratio 1∶3,pH value 2.9 and developing time 5 min for carboxylic SiO_(2),and dilution ratio 1∶5,pH value 3.5 and developing time 5 min for sulfonic SiO_(2).The newly synthesized nanocomposites are highly efficient and safe when utilized for latent fingerprint developing.

关 键 词：指纹 纳米二氧化硅 荧光 小颗粒悬浮液 

分 类 号：O657.3[理学—分析化学]