Powder dusting method is the most practically useful approach for latent fingerprint development in the crime scene. Herein, a general powder dusting method has been explored for latent fingerprint development based on aggregation-induced emission luminogens (AIEgens). A series of tetraphenylethene (TPE) derivatives with multiple diphenylamine (DPA), namely, TPE-DPA, TPE-2DPA and TPE-4DPA, were selected as candidates to dope with magnetic powders and applied for latent fingerprint development. After screening, the magnetic powder 3 doped with TPE-4DPA proves to be the best, in terms of fluorescent intensity, resolution and adhesiveness. Afterwards, the magnetic powder 3 was applied for visualization of latent fingerprint on various smooth and porous substrates, including glass, stainless steel, leaf, ceram, plastic bag, lime wall, wood and paper money. Specific details, such as island, core, termination and bifurcation, can be clearly observed for the fluorescent fingerprint images.
latent fingerprint development powder dusting aggregation-induced emission
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This work was supported by the Opening Project Fund of Shanghai Key Laboratory of Criminal Scene Evidence (2011-23417049), the Academician Foundation of the Ministry of Public Security of China (2011-23214203, 23215243, 23317015), Program for Young Innovative Research Team in China University of Political Science and Law (18CXTD09, 16CXTD05), the National Natural Science Foundation of China (21788102), the Research Grants Council of Hong Kong (16308116, C2014−15G, A-HKUST605/16, C6009-17G), the Nissan Chemical Industries Ltd., the AIEgen Biotech Co. Ltd., the Innovation and Technology Commission (ITC-CNERC14SC01), and the Science and Technology Plan of Shenzhen (JCY20160229205601482).
1.Key Laboratory of Evidence Science (China University of Political Science and Law)Ministry of EducationBeijingChina
2.Collaborative Innovation Center of Judicial CivilizationBeijingChina
3.Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Division of Life Science, State Key Laboratory of Molecular Neuroscience, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineeringthe Hong Kong University of Science and TechnologyClear Water Bay, KowloonChina
4.NSFC Center for Luminescence from Molecular Aggregates, SCUT-HKUST Joint Research Institute, State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina