A rapid and operator-safe powder approach for latent fingerprint detection using hydrophilic Fe3O4@SiO2-CdTe nanoparticles

A rapid and operator-safe powder approach for latent fingerprint detection using hydrophilic Fe3O4@SiO2-CdTe nanoparticles
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一种使用亲水性 Fe3O4@SiO2-CdTe 纳米颗粒进行潜指纹检测的快速且操作员安全的粉末方法

DOI:
10.1007/s11426-019-9460-0
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发表时间:
2019-04
期刊:
Science China Chemistry
影响因子:
--
通讯作者:
Huang Xiaoyu
Huang Xiaoyu
中科院分区:
其他
文献类型:
--
作者:
Wang Zhaolei;Jiang Xue;Liu Wenbin;Lu Guolin;Huang Xiaoyu

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将谷胱甘糖(GSH)修饰的CdTe量子点(QDs)与Fe3O4@SiO2NPs共价结合,制备了一种表面含有丰富羧基的新型双功能磁荧光纳米粒子(NPs)。通过(3-氨基丙基)三乙氧基硅烷将二氧化硅包覆的Fe3O4NPs与氨基官能化得到Fe3O4@SiO2-NH2NPs,然后与gsh修饰的CdTe量子点化学偶联形成双功能磁荧光NPs, Fe3O4@SiO2-NH-CO-CdTe-QDs NPs。利用红外光谱(FTIR)、x射线衍射(xrd)、透射电子显微镜(TEM)、吸收光谱和荧光光谱以及振动样品磁强计对Fe3O4@SiO2-NH-CO-CdTe-QDs NPs的性质和形貌进行了研究。TEM图像显示Fe3O4@SiO2-NH-CO-CdTe-QDs NPs具有球形核壳结构,尺寸均匀,约为50 nm。发现双功能NPs具有良好的磁性和强荧光特性,有利于其在潜在指纹检测中的应用。此外,NPs表面的羧基对空气中的水分和指纹残留物有良好的吸收作用,既可以避免灰尘飞扬,保护操作人员的健康,又可以提高检测效率。
A new kind of bifunctional magnetic-fluorescent nanoparticles (NPs) with abundant carboxyls on the surface has been prepared by covalently combining glutathiose (GSH)-modified CdTe quantum dots (QDs) with Fe3O4@SiO2NPs. The silica-coated Fe3O4NPs were functionalized with amino groups by (3-aminopropyl)triethoxysilane to provide Fe3O4@SiO2-NH2NPs, which was then chemically conjugated with GSH-modified CdTe QDs to form bifunctional magnetic-fluorescent NPs, Fe3O4@SiO2-NH-CO-CdTe-QDs NPs. The properties and morphologies of Fe3O4@SiO2-NH-CO-CdTe-QDs NPs were investigated by FTIR, Xray diffraction, transmission electron microscopy (TEM), absorption and fluorescence spectroscopy and vibrating sample magnetometry. TEM images display that Fe3O4@SiO2-NH-CO-CdTe-QDs NPs possess spherical core-shell structure with a uniform size about 50 nm. The bifunctional NPs were found to exhibit good magnetic and strong fluorescent properties favorable for their application in the detection of latent fingerprints. Furthermore, the carboxyls on the surface of NPs have good absorptions with water in air and the residues of fingerprints so as to not only avoid dust flying to protect the health of operators, but also improve the efficiency of detection.
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