A general powder dusting method for latent fingerprint development based on AIEgens |
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| Authors: | Zijie Qiu Bin Hao Xinggui Gu Zhaoyu Wang Ni Xie Jacky W Y Lam Hongxia Hao Ben Zhong Tang |
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| Institution: | 1.Key Laboratory of Evidence Science (China University of Political Science and Law),Ministry of Education,Beijing,China;2.Collaborative Innovation Center of Judicial Civilization,Beijing,China;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 Engineering,the Hong Kong University of Science and Technology,Clear Water Bay, Kowloon,China;4.NSFC Center for Luminescence from Molecular Aggregates, SCUT-HKUST Joint Research Institute, State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou,China |
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| Abstract: | 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. |
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