A rapid and operator-safe powder approach for latent fingerprint detection using hydrophilic Fe3O4@SiO2-CdTe nanoparticles
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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@SiO2 NPs. The silica-coated Fe3O4 NPs were functionalized with amino groups by (3-aminopropyl)triethoxysilane to provide Fe3O4@SiO2-NH2 NPs, 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.
Keywordsfingerprint magnetic nanoparticle fluorescence quantum dot
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This work was supported by National Key Research and Development Program of China (213 project), National Basic Research Program of China (2015CB931900), National Science Foundation for Distinguished Young Scholars (51825304), the National Natural Science Foundation of China (21632009, 21674124, 21704110), Strategic Priority Research Program of Chinese Academy of Sciences (XDB20000000), Shanghai Scientific and Technological Innovation Project (16DZ1205600, 16JC1402500, 17DZ1205401, 17DZ1205402, 18JC1410600, 18JC1415500, 18ZR1448600) and Opening Project of Shanghai Key Laboratory of Crime Scene Evidence (2017XCWZK24, 2015XCWZK15).