共查询到16条相似文献,搜索用时 187 毫秒
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目的研究水浸客体表面潜指纹的显现方法;方法利用CdSe巯基乙酸溶液显现被水浸泡过的黄色封箱胶带、黑色塑料袋、玻璃等常见非渗透性客体上的潜手印,讨论影响水浸非渗透性客体上潜手印显现效果的各种因素,并与传统方法进行比较,初步探讨了CdSe巯基乙酸溶液显现水浸非渗透性客体表面潜手印的方法;结果使用巯基乙酸包覆CdSe纳米复合材料显现潜在手印,使每分子纳米复合材料外表包覆足够数量的羧基,则可以提高它同手印残留物的结合能力,从而得到更高清晰度、更高分辨率的手印显像;结论巯基乙酸包覆CdSe纳米复合材料可以很好的显现水浸塑料、胶带等表面潜指纹。 相似文献
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如何提取及剥离胶带粘面的指印 总被引:3,自引:3,他引:0
胶带粘面上的手印显现,一直是比较难处理的,经过多次实验并在实际案例中使用,笔者发现悬浮液法与染色法对胶带粘面上的手印显现效果很好.如1999年6月末,天津某县发生一起入室抢劫杀人案,犯罪分子用黄色封箱胶带缠在被害人脸部,现场勘查中提取两段胶带(一段长约10cm,另一段长约20cm),用悬浮 相似文献
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本文利用纳米CdSe溶液显现了白色塑料、塑钢上面的油脂手印,比较了该试剂和传统试剂的增显效果,初步探讨了纳米CdSe溶液增强“502”胶显现手印的应用前景. 相似文献
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PAMAM G7.0的制备及在非渗透性表面手印显现中的应用 总被引:1,自引:1,他引:0
目的探索一种非渗透性表面手印显现的新方法。方法根据现有方法合成第七代聚酰胺-胺(PAMAM G7.0)树形分子材料,并使用荧光光谱法对产物进行荧光测试;将合成材料对多种客体表面、不同遗留时间的手印进行显现,并将显现结果与粉末法和传统的荧光染料法进行比对。结果实验表明该荧光材料在365nm光激发下可以发出较强的可见荧光;与粉末法和传统的荧光染料法相比,PAMAM G7.0可以同手印残留物进行高选择性结合,手印纹线与背景之间的反差大。结论PAMAMG7.0可以有效地显出非渗透性客体表面的手印。 相似文献
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掺杂Cd的水溶性荧光ZnSe/MPA量子点显现胶带手印方法 总被引:1,自引:0,他引:1
目的探索水溶性荧光量子点溶液——掺杂镉的硒化锌(ZnxCd(1-x)Se)对胶带手印的显现方法。方法以巯基丙酸(MPA)为修饰剂合成了掺杂Cd的水溶性荧光ZnSe/MPA量子点,利用它显现水浸胶带及粘连胶带上的油汗指印,并在365nm下拍照成像。结果良好的显现出水浸胶带上的指印以及粘连胶带上的指印。与常规方法相比,优势更为明显。结论水溶性荧光量子点ZnxCd(1-x)Se溶液显出的指印纹线细腻流畅,在法庭科学领域具有很好的应用前景。 相似文献
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胺端基型CdS/PAMAM潜在显现指印的应用 总被引:1,自引:0,他引:1
目的探索一种新型纳米荧光材料的制备方法及其在潜在指印显现方面的应用前景。方法以聚酰胺-胺(PAMAM)树形分子为模板,原位合成CdS纳米簇。并使用荧光光谱法对产物进行表征:应用这种新型荧光材料对多种客体表面、不同陈旧程度的潜在指印进行显现.并将显现结果与传统荧光染料进行比对。结果该荧光材料在365nm紫外光激发下可以发出很强的可见荧光:与传统的荧光染料相比。-NH2端基型CdS/PA—MAM可以同指印残留物进行靶向结合.其荧光强度高、背景干扰小,指印纹线与客体反差大。结论-NH2端基型CdS/PAMAM可以有效地显出非渗透性客体表面的潜在指EP。 相似文献
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Uniform and well-dispersed photoluminescent semiconductor CdS (cadmium sulfide) QDs (quantum dots) were in situ prepared inside Generation 4.0-NH(2) PAMAM (polyamidoamine) dendrimers in methanol, methanol and water mixed solutions of volume ratio 1:9, respectively. The prepared solutions containing photoluminescent semiconductor CdS QDs were utilized for detection of cyanoacrylate ester fumed fingerprints on tinfoil. The results show that fumed latent fingerprints treated with prepared CdS/PAMAM nanocomposites in methanol, 1:9 methanol:water mixed solutions emit pale yellow-green and orange luminescence respectively under ultraviolet excitation of 365 nm from an UV LED. Fumed fingerprints were successfully detected with good resolving rate and the mechanism was studied in detail. 相似文献
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CdS/dendrimer nanocomposites with a range of concentrations of the photoluminescent semiconductor nanocluster and the dendrimer are prepared in methanol and 1:9 methanol:water solutions. The solutions are utilized for detection of cyanoacrylate ester fumed and unfumed fingerprints on polyethylene and aluminum foil. 相似文献
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The effect of the shape of semiconductor nanocrystals on their performance for visualising latent fingermarks was investigated for the first time. Highly luminescent CdSe/CdS core/shell nanocrystals in rod and spherical shapes were synthesised in organic solvent and transferred to aqueous solution using ligand exchange. The 3-mercaptopropionic acid coated nanorods and nanospheres were characterised using electron microscopy and UV-visible absorbance and luminescence spectrophotometry. A simple and rapid development of fresh to less than a week-old natural fingermarks from 4 donors (male and female) on non-porous surfaces including glass slides, aluminium foil and germanium disks using both CdSe/CdS core/shell nanorods and spherical dots was achieved, wherein nanorods demonstrated an enhanced development of ridge details in comparison to the spherical dots. 相似文献
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Menzel ER Savoy SM Ulvick SJ Cheng KH Murdock RH Sudduth MR 《Journal of forensic sciences》2000,45(3):545-551
The concept of utilizing photoluminescent semiconductor nanocrystals for latent fingerprint detection, especially in concert with phase-resolved imaging for background fluorescence suppression, is reduced to practice with CdS nanocrystals that are capped with dioctyl sulfosuccinate. The nanocrystals are dissolved in heptane or hexane and are applied in much the same way as staining with fluorescent dye, on articles that have been pre-fumed with cyanoacrylate ester and also on the sticky side of electrical tape without pre-fuming. Since CdS can form a photoluminescent nanocomposite with dendrimers, a feasibility examination of dendrimer tagging of fingerprints has also been conducted. 相似文献
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Conventional development of latent fingerprints is compromised when the prints are decomposed by extreme temperatures, such as those encountered when a weapon cartridge is fired, an improvised explosive device is detonated, and/or in arson cases. Understanding how these extreme temperatures alter the chemical and physical properties of latent fingerprint residue could aid in the discovery of a reagent that could effectively develop these decomposed fingerprints. To mimic scenarios where fingerprints may be exposed to high heat conditions, standards of the five most abundant amino acids in fingerprint residue as well as extracted fingerprint residue were pyrolized under controlled conditions. Compounds identified as pyrolytic decomposition products were 3,6-dimethylpiperazine-2,5-dione (from alanine), maleimide, and 2,5-furandione (from aspartic acid). The pyrograms and selected ion traces show these products to hold promise as indicators of decomposed fingerprint residues and, therefore, may serve as good candidate substrates for a developing reagent. 相似文献