CdS量子点的合成和指纹检测研究

本工作提出以谷胱甘肽(GSH)为修饰试剂合成了高量子产率的硫化镉量子点,并应用其对非渗透性客体玻璃上的潜在指纹进行显现。结果发现,显现出的指纹清晰可辨,且与背景之间的反差好。该方法具有简便、快速、灵敏、安全、经济等特点。     

乙醇为承载液时DFO指纹显现液的性能及应用

以乙醇替代CFC-113或HFE-7100作为承载液,考察了1,8-二氮芴-9-酮（1,8-Diaza-fluorene-9-one,DFO）对常用纸张和墨迹上指纹的显现性能。结果表明：乙醇为承载液时,DFO对常用纸张上指纹的显现效果无明显差异;除油性圆珠笔墨迹外,常用的中性签字笔墨迹、碳素墨迹、蓝黑墨迹、纯蓝墨迹、激光打（复）印件墨迹和报纸墨迹均不影响指纹显现。     

紫外照相技术在指纹检验中的应用

在犯罪事发现场,可以在玻璃、塑料、油漆家具,瓷器、地砖等物体上,找出罪犯、受害者、嫌疑犯或证人的指纹。这些指纹用普通照相方法难以摄取清楚的影像,而用特种紫外线照相技术却可获得清晰的影像,对刑事侦察极为有用。本文对此进行了简要介绍。     

Facile Synthesis of Highly Water‐Soluble Lanthanide‐Doped t‐LaVO4 NPs for Antifake Ink and Latent Fingermark Detection

In the information age, it is important to protect the security and integrity of the information. As a result, the fluorescent ink as an antifake technology and the fingermark as an information carrier have aroused great interest. In this work, highly water‐soluble lanthanide (Ln³⁺)‐doped tetragonal phase (t‐) LaVO₄ nanoparticles (NPs) are successfully obtained via a simple, fast, and green microwave‐assisted hydrothermal method. The average size of t‐LaVO₄ NPs is about 43 nm. The aqueous solutions of Ln³⁺‐doped t‐LaVO₄ exhibit excellent fluorescence properties under ultraviolet light (UV) excitation (t‐LaVO₄:10%Eu is bright red and t‐LaVO₄:0.5%Dy is close to white). Some superb antifake fluorescent patterns are printed using Ln³⁺‐doped t‐LaVO₄ aqueous solution as ink, which indicates the as‐prepared Ln³⁺‐doped t‐LaVO₄ NPs as fluorescent ink can meet the various antifake requirements. Notably, the designed convenient antifake fluorescent codes with improved security could be directly scanned and decoded by a smart phone. What's more, the as‐prepared NPs can be used for the development of latent fingermark on various substrates and the second‐level detail information can be clearly obtained from the magnification of a fingermark. These results indicate that the as‐prepared Ln³⁺‐doped t‐LaVO₄ fluorescent NPs have great potential in security application.     

Non‐toxic luminescent carbon dot/poly(dimethylacrylamide) nanocomposite reagent for latent fingermark detection synthesized via surface initiated reversible addition fragmentation chain transfer polymerization

Here, non‐toxic luminescent carbon nanoparticles, namely carbon dots (C‐dots), were facilely synthesized via a one‐pot hydrothermal route. Raman, Fourier transform infrared, fluorescence, carbon NMR and X‐ray photoelectron spectroscopies revealed that the C‐dots possessed a graphitic‐like core with an oxidized surface. The oxidized surface of the C‐dots allowed for functionalization of the C‐dots with a 2‐methyl‐2‐[(dodecylsulfanylthiocarbonyl)sulfanyl]propanoic acid chain transfer agent. Poly(N,N‐dimethylacrylamide) (p(DMA)) was then grafted from the C‐dot surface via surface initiated reversible addition fragmentation chain transfer (RAFT) polymerization. The resulting luminescent C‐dot/polymer nanocomposite, C‐dot/p(DMA), was analyzed using UV?visible and fluorescence spectrometry verifying that the functionalized surface was responsible for the C‐dots' luminescence. This C‐dot/p(DMA) nanocomposite was water soluble and was used as a solution for the luminescent detection of latent fingermarks deposited on non‐porous aluminium foil substrates. © 2014 Society of Chemical Industry     

利用碘-苯黄酮和四氧化钌喷涂剂显现潜在指纹信息的研究

本文利用2种喷涂试剂,碘-苯黄酮和四氧化钌(RTX)与传统刷粉技术显现潜在指纹信息,做了比对评价。不是所有客体表面的指纹和陈旧痕迹,都同时适用于喷涂和刷粉技术,如玻璃和木制家具上的指纹显现,刷粉技术仍然是首选。而喷涂技术用于壁纸、乙烯基材料和地砖上的指纹显现效果较好。注意:刷粉或氰基丙烯酸酯(用罗丹明6G染色)熏显技术与RTX喷涂技术不能同时使用,因为这2类药物不相容。但在使用刷粉技术之前或之后,再用碘-苯黄酮喷涂,指纹显现效果较好,而碘-苯黄酮与氰基丙烯酸酯不能同时使用。在碘-苯黄酮配方中,使用HFC4310mee和HFE7100两种溶解剂与原配方中的CFC113溶解剂相比,没有发现差异。但CFC113含有氟利昂,严重污染环境,所以推荐使用HFC4310mee作为理想的替换试剂。由于RTX喷涂剂比较昂贵,目前正在寻找与RTX相媲美且廉价的化学试剂,同时使用寿命在2个月以上。对于不同的客体表面,依据指纹的陈旧性,推荐使用以下技术:刷粉适用于玻璃和木制家具上的所有陈旧指纹,指纹的陈旧性在3天或更长一点时间;碘-苯黄酮喷涂适用于壁纸、乙烯基材料、地砖和粗糙的原木上;RTX喷涂适用于壁纸和油漆上的新鲜指纹,而指纹陈旧性在1天以内。