巯基乙酸修饰的硫化镉量子点/聚醋酸乙烯酯凝胶指纹膜的辐射构建及其显现性能  

Radiation construction and display performance of a thioglycollic acid-modified cadmium sulfide quantum dots/polyvinyl acetate gel fingerprint film

作　　者：张金 张洋林 刘坤 周士忠 李月生 陈黄琴[4] ZHANG Jin;ZHANG Yanglin;LIU Kun;ZHOU Shizhong;LI Yuesheng;CHEN Huangqin(School of Nuclear Technology and Chemical Biology,Hubei University of Science and Technology,Xianning 437100,China;School of Pharmacy,Hubei University of Science and Technology,Xianning 437100,China;Hubei Key Laboratory of Radiation Chemistry and Functional Materials,Hubei University of Science and Technology,Xianning 437100,China;School of Stomatology and Optometry,Hubei University of Science and Technology,Xianning 437100,China)

机构地区：[1]湖北科技学院核技术与化学生物学院,咸宁437100 [2]湖北科技学院药学院,咸宁437100 [3]湖北科技学院辐射化学与功能材料湖北省重点实验室,咸宁437100 [4]湖北科技学院口腔与眼视光医学院,咸宁437100

出　　处：《辐射研究与辐射工艺学报》2024年第4期12-21,共10页Journal of Radiation Research and Radiation Processing

基　　金：湖北省科技厅科技重点研发计划(2022BCE026);湖北省高等学校优秀中青年科技创新团队项目(T2020022);咸宁市科技研究与开发(高新类研发重点专项)项目(2021GXYF021);湖北科技学院科学发展基金(2020TD01、2022FH09)资助。

摘　　要：指纹是警方鉴定识别罪犯身份的重要痕迹物证。硫化镉量子点(CdS QDs)是一种荧光标记的纳米材料,可以用于提高指纹的清晰度和分辨率。本文通过原位辐射还原法将巯基乙酸(TGA)成功修饰到CdS QDs上,将合成的TGA-CdS QDs与聚醋酸乙烯酯(PVAc)结合形成TGA-CdS QDs/PVAc凝胶指纹膜应用于指纹显现。利用傅里叶变换红外(FTIR)光谱、荧光光谱、X射线衍射仪(XRD)、扫描电镜(SEM)等表征手段对TGACdS QDs的结构与性能进行表征与测试。探讨了温度、TGA-CdS QDs的浓度、pH以及PVAc凝胶指纹膜的质量分数对指纹显现效果的影响。结果表明,6 mg/mL TGA-CdS QDs溶液与20%PVAc凝胶指纹膜在室温(25℃)、pH为9.0的条件下组合,荧光显现的指纹纹路最清晰完整,分辨率最高。TGA-CdS QDs在碱性溶液中形成的羧酸根与黏附在PVAc凝胶膜上指纹残留物中氨基酸、蛋白质、油脂、尿素等成分紧密结合,在紫外线照射下,指纹纹路会以荧光的形式清晰显现出来。该指纹显现方法可以有效地应用于刑事侦查中。Fingerprints are an important trace material evidence for police to identify criminal.Cadmium sulfide quantum dots(CdS QDs)are fluorescent-labeled nanomaterials that can be used to improve the clarity and resolution of fingerprints.In this study,thioglycollic acid(TGA)was successfully modified to CdS QDs using the insitu radiation reduction method,and synthetic TGA-CdS QDs were combined with polyvinyl acetate(PVAc)to form a TGA-CdS QDs/PVAc gel fingerprint film for fingerprint development.The structure and properties of the TGACdS QDs were characterized and tested using Fourier transform infrared(FTIR)spectroscopy,fluorescence spectrum,X-ray diffraction(XRD),and scanning electron microscopy(SEM).The effects of temperature,concentration of TGA-CdS QDs,pH,and mass fraction of the PVAc gel fingerprint film on fingerprint development were investigated.The results showed that a combination of 6 mg/mL TGA-CdS QDs solution with 20%PVAc gel fingerprint film at room temperature(25℃)and pH of 9.0 resulted in the clearest,most complete,and highresolution fingerprint patterns of fluorescence display.The carboxylic acid group formed by TGA-CdS QDs in an alkaline solution completely combined with the amino acids,proteins,fats,urea,and other components of the fingerprint residue attached to the PVAc gel film.Under ultraviolet irradiation,the fingerprint lines were clearly displayed in the form of fluorescence.The fingerprint display method can be effectively used in criminal investigation.

关 键 词：辐射 量子点 PVAc凝胶 指纹膜 显现性能 

分 类 号：TL13[核科学技术—核能科学]